Old Second Bancorp (OSBC) 10-K 7 Mar 24 2023 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Mar. 06, 2024	Jun. 30, 2023
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2023
Entity File Number	000-10537
Entity Registrant Name	OLD SECOND BANCORP INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	36-3143493
Entity Address, Address Line One	37 South River Street
Entity Address, City or Town	Aurora
Entity Address, State or Province	IL
Entity Address, Postal Zip Code	60507
City Area Code	(630)
Local Phone Number	892-0202
Title of 12(b) Security	Common Stock
Trading Symbol	OSBC
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 559.1
Entity Common Stock, Shares Outstanding		44,801,278
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0000357173
Amendment Flag	false
Auditor Name	Plante & Moran PLLC
Auditor Firm ID	166
Auditor Location	Chicago, Illinois

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Assets
Cash and due from banks	$ 55,534	$ 56,632
Interest earning deposits with financial institutions	44,611	58,545
Cash and cash equivalents	100,145	115,177
Securities available-for-sale, at fair value	1,192,829	1,539,359
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock	33,355	20,530
Loans held-for-sale	1,322	491
Total Loans	4,042,953	3,869,609
Less: allowance for credit losses on loans	44,264	49,480
Net loans	3,998,689	3,820,129
Premises and equipment, net	79,310	72,355
Other real estate owned	5,123	1,561
Mortgage servicing rights, at fair value	10,344	11,189
Goodwill	86,478	86,478
Core deposit intangible	11,217	13,678
Bank-owned life insurance ("BOLI")	109,318	106,608
Deferred tax assets, net	31,077	44,750
Other assets	63,592	56,012
Total assets	5,722,799	5,888,317
Deposits:
Noninterest bearing demand	1,834,891	2,051,702
Interest bearing:
Savings, NOW, and money market	2,207,949	2,617,100
Time	527,906	441,921
Total deposits	4,570,746	5,110,723
Securities sold under repurchase agreements	26,470	32,156
Other short-term borrowings	405,000	90,000
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,382	59,297
Senior notes		44,585
Notes payable and other borrowings		9,000
Other liabilities	58,147	55,642
Total liabilities	5,145,518	5,427,176
Stockholders' Equity
Common stock	44,705	44,705
Additional paid-in capital	202,223	202,276
Retained earnings	393,311	310,512
Accumulated other comprehensive loss	(62,781)	(93,124)
Treasury stock	(177)	(3,228)
Total stockholders' equity	577,281	461,141
Total liabilities and stockholders' equity	$ 5,722,799	$ 5,888,317

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Consolidated Balance Sheets
Common stock, Par value (in dollars per share)	$ 1	$ 1
Common stock, Shares authorized	60,000,000	60,000,000
Common stock, Shares issued	44,705,150	44,705,150
Common stock, Shares outstanding	44,697,917	44,582,311
Treasury stock, Shares	7,233	122,839

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Interest and dividend income
Loans, including fees	$ 244,187	$ 176,379	$ 90,613
Loans held-for-sale	91	130	165
Securities:
Taxable	37,940	31,566	8,168
Tax exempt	5,329	5,287	5,107
Dividends from FHLBC and FRBC stock	1,920	936	456
Interest bearing deposits with financial institutions	2,503	2,175	656
Total interest and dividend income	291,970	216,473	105,165
Interest expense
Savings, NOW, and money market deposits	8,761	1,900	961
Time deposits	6,636	1,448	1,510
Securities sold under repurchase agreements	93	40	82
Other short-term borrowings	18,774	480
Junior subordinated debentures	1,095	1,136	1,133
Subordinated debentures	2,185	2,185	1,610
Senior notes	2,408	2,682	2,692
Notes payable and other borrowings	87	446	462
Total interest expense	40,039	10,317	8,450
Net interest and dividend income	251,931	206,156	96,715
Provision for credit losses	16,501	6,550	4,326
Net interest and dividend income after provision for credit losses	235,430	199,606	92,389
Noninterest income
Mortgage servicing rights mark to market (loss) gain	(1,425)	3,177	1,261
Net gain on sales of mortgage loans	1,477	2,022	9,300
Securities (losses) gains, net	(4,148)	(944)	232
Change in cash surrender value of BOLI	2,120	718	1,390
Card related income	10,051	10,989	6,712
Other income	4,196	5,243	2,329
Total noninterest income	34,179	43,116	39,260
Noninterest expense
Salaries and employee benefits	88,566	86,573	57,691
Occupancy, furniture and equipment	14,437	14,992	13,548
Computer and data processing	7,277	15,795	7,936
FDIC insurance	2,705	2,401	975
Net teller & bill paying	2,115	3,730	874
General bank insurance	1,212	1,221	1,214
Amortization of core deposit intangible	2,461	2,626	644
Advertising expense	721	589	343
Card related expense	5,123	4,348	2,538
Legal fees	927	873	1,096
Consulting & management fees	2,415	2,425	5,005
Other real estate expense, net	399	130	151
Other expense	16,843	15,470	11,767
Total noninterest expense	145,201	151,173	103,782
Income before income taxes	124,408	91,549	27,867
Provision for income taxes	32,679	24,144	7,823
Net income	$ 91,729	$ 67,405	$ 20,044
Basic earnings per share	$ 2.05	$ 1.51	$ 0.66
Diluted earnings per share	2.02	1.49	0.65
Dividends declared per share	$ 0.20	$ 0.20	$ 0.16
Wealth management
Noninterest income
Service charges on deposits	$ 9,803	$ 9,887	$ 9,408
Service charges on deposits
Noninterest income
Service charges on deposits	9,817	9,562	5,403
Secondary mortgage fees
Noninterest income
Service charges on deposits	259	332	1,044
Mortgage servicing income
Noninterest income
Service charges on deposits	$ 2,029	$ 2,130	$ 2,181

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Consolidated Statements of Comprehensive Income (Loss)
Net Income (Loss)	$ 91,729	$ 67,405	$ 20,044
Unrealized holding gains (losses) on available-for-sale securities arising during the period	35,160	(139,876)	(8,513)
Related tax (expense) benefit	(9,889)	39,166	2,406
Holding gains (losses), after tax, on available-for-sale securities	25,271	(100,710)	(6,107)
Less: Reclassification adjustment for the net (losses) gains realized during the period
Net realized (losses) gains	(4,148)	(944)	232
Related tax benefit (expense)	1,117	265	(65)
Net realized (losses) gains after tax	(3,031)	(679)	167
Other comprehensive income (loss) on available-for-sale securities	28,302	(100,031)	(6,274)
Changes in fair value of derivatives used for cash flow hedges	2,851	(2,579)	389
Related tax (expense) benefit	(810)	718	(109)
Other comprehensive income (loss) on cash flow hedges	2,041	(1,861)	280
Total other comprehensive income (loss)	30,343	(101,892)	(5,994)
Total comprehensive income (loss)	$ 122,072	$ (34,487)	$ 14,050

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities
Net income	$ 91,729	$ 67,405	$ 20,044
Adjustments to reconcile net income to net cash provided by operating activities:
Net premium / discount amortization on securities	3,317	5,217	2,932
Securities losses (gains), net	4,148	944	(232)
Provision for credit losses	16,501	6,550	4,326
Originations of loans held-for-sale	(52,091)	(76,607)	(239,175)
Proceeds from sales of loans held-for-sale	52,186	81,776	254,374
Net gains on sales of mortgage loans	(1,477)	(2,022)	(9,300)
Mortgage servicing rights mark to market loss (gain)	1,425	(3,177)	(1,261)
Net accretion of discount on loans and unfunded commitments	(3,067)	(6,339)	(1,177)
Net change in cash surrender value of BOLI	(2,120)	(718)	(1,390)
Net gains on sale of other real estate owned	(256)	(163)	(41)
Provision for other real estate owned valuation losses	269	104	79
Depreciation of fixed assets and amortization of leasehold improvements	4,485	4,085	3,152
Write-down of fixed assets			3,809
Net gains on disposal and transfer of fixed assets	(623)	(2,017)
Amortization of core deposit intangibles	2,461	2,626	644
Change in current income taxes receivable	(4,872)	12,048	(9,286)
Deferred tax expense	1,857	969	6,479
Change in accrued interest receivable and other assets	(5,881)	(940)	6,865
Accretion of purchase accounting adjustment on time deposits	(1,226)	(1,582)	(155)
Change in accrued interest payable and other liabilities	6,033	6,225	(11,075)
Stock based compensation	3,603	2,960	1,435
Net cash provided by operating activities	116,401	97,344	31,047
Cash flows from investing activities
Proceeds from maturities and calls, including pay down of securities available-for-sale	186,049	279,848	138,874
Proceeds from sales of securities available-for-sale	205,738	30,981	605,846
Purchases of securities available-for-sale	(13,414)	(301,649)	(886,103)
Net purchases of FHLBC/FRBC stock	(12,825)	(7,273)
Net change in loans	(197,574)	(443,904)	122,102
Purchases of BOLI policies	(590)	(590)	(591)
Proceeds from sales of other real estate owned, net of participations and improvements	2,005	941	5,828
Proceeds from disposition of premises and equipment	4,542	13,346
Net purchases of premises and equipment	(12,376)	(4,332)	(2,033)
Cash paid for acquisition, net of cash and cash equivalents acquired		(146)	148,995
Net cash provided by (used in) investing activities	161,555	(432,778)	132,918
Cash flows from financing activities
Net change in deposits	(538,751)	(353,927)	235,078
Net change in securities sold under repurchase agreements	(5,686)	(18,181)	(16,643)
Net change in other short-term borrowings	315,000	90,000
Issuance of subordinated debentures, net of issuance costs			59,148
Repayment of term note	(9,000)	(4,000)	(4,000)
Net change in notes payable and other borrowings, excluding term note		(6,056)	(315)
Repayment of senior notes	(45,000)
Dividends paid on common stock	(8,946)	(8,877)	(4,612)
Purchase of treasury stock	(605)	(455)	(10,417)
Net cash (used in) provided by financing activities	(292,988)	(301,496)	258,239
Net change in cash and cash equivalents	(15,032)	(636,930)	422,204
Cash and cash equivalents at beginning of period	115,177	752,107	329,903
Cash and cash equivalents at end of period	100,145	115,177	752,107
Supplemental cash flow information
Income taxes paid, net	35,670	11,232	10,592
Interest paid for deposits	14,210	3,418	2,752
Interest paid for borrowings	24,238	6,777	5,366
Non-cash transfer of loans to other real estate owned	5,580	87	$ 196
Non-cash transfer of fixed assets to other assets	$ 582	$ 4,568

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total
Balance at Dec. 31, 2020	$ 34,957	$ 122,212	$ 236,579	$ 14,762	$ (101,423)	$ 307,087
Increase (Decrease) in Stockholders' Equity
Net income			20,044			20,044
Other comprehensive income loss, net of tax				(5,994)		(5,994)
Dividends declared on common stock			(4,612)			(4,612)
Acquisitions, WSB	9,748	81,154			103,582	194,484
Vesting of restricted stock		(2,358)			2,358
Stock based compensation		1,435				1,435
Purchase of treasury stock from taxes withheld on stock awards					(605)	(605)
Purchase of treasury stock from stock repurchase program					(9,812)	(9,812)
Balance at Dec. 31, 2021	44,705	202,443	252,011	8,768	(5,900)	502,027
Increase (Decrease) in Stockholders' Equity
Net income			67,405			67,405
Other comprehensive income loss, net of tax				(101,892)		(101,892)
Dividends declared on common stock			(8,904)			(8,904)
Vesting of restricted stock		(3,127)			3,127
Stock based compensation		2,960				2,960
Purchase of treasury stock from taxes withheld on stock awards					(455)	(455)
Balance at Dec. 31, 2022	44,705	202,276	310,512	(93,124)	(3,228)	461,141
Increase (Decrease) in Stockholders' Equity
Net income			91,729			91,729
Other comprehensive income loss, net of tax				30,343		30,343
Dividends declared on common stock			(8,930)			(8,930)
Vesting of restricted stock		(3,656)			3,656
Stock based compensation		3,603				3,603
Purchase of treasury stock from taxes withheld on stock awards					(605)	(605)
Balance at Dec. 31, 2023	$ 44,705	$ 202,223	$ 393,311	$ (62,781)	$ (177)	$ 577,281

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 461,141	$ 502,027	$ 307,087
Other comprehensive (loss) income, net of tax	30,343	(101,892)	(5,994)
Balance	$ 577,281	$ 461,141	$ 502,027
Dividend declared and paid (per share)	$ 0.20	$ 0.20	$ 0.16
Total Accumulated Other Comprehensive Income/(Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ (93,124)	$ 8,768	$ 14,762
Other comprehensive (loss) income, net of tax	30,343	(101,892)	(5,994)
Balance	(62,781)	(93,124)	8,768
Accumulated Unrealized Gain (Loss) on Securities Available-for-Sale
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(88,892)	11,139	17,413
Other comprehensive (loss) income, net of tax	28,302	(100,031)	(6,274)
Balance	(60,590)	(88,892)	11,139
Accumulated Unrealized Gain (Loss) on Derivative Instruments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(4,232)	(2,371)	(2,651)
Other comprehensive (loss) income, net of tax	2,041	(1,861)	280
Balance	$ (2,191)	$ (4,232)	$ (2,371)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies
Summary of Significant Accounting Policies	Note 1: Summary of Significant Accounting Policies ​ Nature of Operations ​ The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Station I, LLC, which holds property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2023 presentation. ​ Use of Estimates ​ Principles of Consolidation – ​ Segment Reporting ​ Concentration of Credit Risk ​ Cash and Cash Equivalents ​ Securities ​ Realized securities gains or losses, which are reported in securities (losses) gains, net, in the Consolidated Statements of Income, are recognized on a trade date basis and are determined using the specific identification method. Discounts are accreted into interest income over the estimated life of the related security and premiums are amortized into income to the earlier of the call date or estimated life of the related security using the level yield method. ​ The Company has made a policy election to exclude accrued interest income from the amortized cost basis of available-for-sale debt securities and report accrued interest separately in other assets in the Consolidated Balance Sheets. A debt security is placed on nonaccrual status at the time we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest for a security placed on nonaccrual is reversed against interest income. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable. ​ For available-for-sale debt securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, prior to the recovery of its amortized cost basis. If either of the above criteria is met, the security’s amortized cost basis is written down to fair value through earnings. When the criteria above is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making this assessment, we review changes to the rating of the security by a rating agency, an increase in defaults on the underlying collateral, and the extent to which the securities are issued by the federal government or its agencies, including the amount of the guarantee issued by those agencies, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded through earnings, limited to the amount that the fair value of the security is less than its amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive (loss) income, net of taxes. ​ Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when management believes the uncollectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met. ​ Federal Home Loan Bank and Federal Reserve Bank Stock ​ Loans Held-for-Sale ​ Mortgage loans held for sale are generally sold with servicing rights retained. The carrying value of mortgage loans is reduced by the amount allocated to the servicing right. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related sold loan. ​ Loans ​ Interest income on loans is accrued based on principal amounts outstanding. Loan and lease origination fees, commitment fees, and certain direct loan origination costs are deferred and amortized over the life of the related loans or commitments as a yield adjustment. Fees related to standby letters of credit, whose ultimate exercise is remote, are amortized into fee income over the estimated life of the commitment. Other related fees are recognized as fee income when earned. ​ Past Due and Nonaccrual Loans ​ Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Generally, loans are placed on nonaccrual status (i) when either principal or interest payments become 90 days or more past due based on contractual terms unless the loan is sufficiently collateralized such that full repayment of both principal and interest is expected and is in the process of collection within a reasonable period or (ii) when an individual analysis of a borrower’s creditworthiness indicates a credit should be placed on nonaccrual status whether or not the loan is 90 days or more past due. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on such loans is accounted for on the cash-basis or cost recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash basis method, interest income is recorded when the payment is received in cash. Nonaccrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate there is no longer doubt that the Company will collect all principal and interest due. ​ Purchase Credit Deteriorated (PCD) Loans ​ Purchased credit deteriorated loans (“PCD loans”) are purchased loans, that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on an individual loan basis from an evaluation of each specific loan and its related credit metrics. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ Non-Purchase Credit Deteriorated (Non-PCD) Loans ​ Non-purchased credit deteriorated loans (“non-PCD loans”) are purchased loans, that, as of the date of acquisition, have not experienced a significant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment, and no allowance is established as a Day One fair valuation allowance. The sum of the loan’s purchase price becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a discount or premium, which is comprised of an interest component and a credit component, and is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ A subsequent Day Two adjustment on non-PCD loans is recorded to the allowance for credit losses immediately after acquisition, which reflects the future estimated lifetime credit losses on the non-PCD loans, recorded through the provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ Allowance for Credit Losses (“ACL”) ​ ACL on Loans ​ The ACL on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on loans. The Company’s estimate of the ACL for loans reflects losses expected over the remaining contractual life of the loans. The contractual term does not consider extensions, renewals or modifications. ​ Determination of the ACL on loans is inherently subjective in nature since it requires significant estimates and management judgment, and includes a level of imprecision given the difficulty of identifying and assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the ultimate adequacy of the ACL is dependent upon a variety of factors beyond the Company’s direct control, including, but not limited to, the performance of the loan portfolio, consideration of current economic trends, changes in interest rates and property values, estimated losses on pools of homogeneous loans based on an analysis that uses historical loss experience for prior periods that are determined to have like characteristics with the current period such as pre-recessionary, recessionary, or recovery periods, portfolio growth and concentration risk, management and staffing changes, the interpretation of loan risk classifications by regulatory authorities and other credit market factors. While each component of the ACL on loans is determined separately, the entire balance is available for the entire loan portfolio. ​ The ACL methodology consists of measuring loans on a collective (pool) basis when similar risk characteristics exist. The type of credit composition and risk characteristics of each portfolio segment are as follows: ​ Commercial loans ​ Lease financing receivables – ​ Real estate - commercial loans - ● CRE owner occupied – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ● CRE investor – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. The primary difference between this segment and CRE owner occupied is within the slightly elevated historical loss rates and qualitative factors used, as the CRE investor properties are more susceptible to market conditions affecting commercial real estate performance compared to owner occupied. ​ Real estate - construction loans ​ Real estate - residential loans ● Residential owner-occupied – these loans are secured by 1-4 family residential dwellings that are primary or secondary residences and the Company holds a first lien position. The Company applies historical loss rates from periods with like characteristics as the current period, with a longer remaining life than other segments, due to the usually longer-term nature of these loans. ● Residential investor – these loans are secured by 1-4 family residential dwellings that are not a primary or secondary residence and the Company holds a first lien position. The Company applies historical loss rates from periods with like characteristics as the current period, with a slightly longer remaining life than other segments, but shorter duration than residential owner-occupied. ● Multifamily – these loans are secured by 5+ unit residential dwellings and the Company typically holds a first lien position. The Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ​ Home equity lines of credit (“HELOCs”) ​ Consumer loans ​ The methodologies used for calculating the ACL on each loan segment include (i) a migration analysis for commercial, CRE owner occupied, CRE investor, and multifamily segments; (ii) a static pool analysis for construction, residential investor, residential owner occupied and the HELOC segments; and (iii) a WARM (weighted average remaining maturity) methodology is used for lease financing receivables and consumer segments. The forecast period used for each segment calculation was one year, with an immediate reversion to historical loss rates following this one year period. In addition, the Company applies qualitative adjustments to each different loan or lease segment, as described below. ​ The qualitative factors applied to each ● changes in lending policies and procedures, including changes in underwriting standards and collections, charge-offs and recovery practices; ● changes in international, national, regional, and local conditions (specific factors which impact portfolios or discrepancies with national economic factors which are utilized within the economic forecast); ● changes in the experience, depth and ability of lending management; ● changes in the volume and severity of past due loans and other similar loan conditions; ● changes in the nature and volume of the loan portfolio and terms of loans; ● the existence and effect of any concentrations of credit and changes in the levels of such concentrations (this characteristic requires any portfolio exceeding 25% of capital to have a factor considered unless the pool is otherwise well diversified or holds a relatively low inherent risk); ● effects of other external factors, such as competition, legal or regulatory factors, on the level of estimated credit losses; ● changes in the quality of our loan review functions; and ● changes in the value of underlying collateral for collateral dependent loans. ​ The impact of the above listed internal and external qualitative and credit market risk factors is assessed within predetermined ranges to adjust the ACL totals calculated. Changes in the above factors are assessed no less than quarterly, and directly impact the total estimated credit losses recorded. ​ Loans that do not share risk characteristics are evaluated on an individual basis. Such loans evaluated individually are not also included in the collective evaluation. The amount of expected credit loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral less applicable selling costs. When management determines that foreclosure is probable, the amount of credit loss is determined using the fair value of collateral, less costs to sell. ​ Loans are charged off against the ACL when management believes the uncollectibility of a loan balance is confirmed, while recoveries of amounts previously charged-off are credited to the ACL. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged off. Approved releases from previously established ACL reserves authorized under our ACL methodology also reduce the ACL. Additions to the ACL are established through the provision for credit losses on loans, which is charged to expense. The Company’s ACL methodology is intended to reflect all loan portfolio risk, but management recognizes the inability to accurately depict all future credit losses in a current ACL estimate, as the impact of various factors cannot be fully known. Accrued interest receivable on loans is excluded from the amortized cost basis of financing receivables for the purpose of determining the allowance for credit losses. ​ ACL on Unfunded Loan Commitments ​ The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk by a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The ACL related to off-balance sheet credit exposures, which is within other liabilities on the Company’s Consolidated Balance Sheets, is estimated at each balance sheet date under the CECL model, and is adjusted as determined necessary through the provision for credit losses on the income statement. The estimate for ACL on unfunded loan commitments includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life. ​ Premises and Equipment ​ Whenever events or changes in circumstances dictate, the Company tests its long-lived assets for impairment by determining whether the sum of the estimated undiscounted future cash flows attributable to a long-lived asset or asset group is less than the carrying value of the long-lived asset or asset group through a probability-weighted approach. In the event the carrying amount of the long-lived asset or asset group is not recoverable, an impairment loss is measured as the amount by which the carrying amount of the long-lived asset or asset group exceeds its fair value. ​ Other Real Estate Owned (“OREO”) ​ Mortgage Servicing Rights ​ Mortgage loans that the Company is servicing for others aggregated to $737.2 million and $771.4 million at December 31, 2023, and 2022, respectively. Mortgage loans that the Company is servicing for others are not included in the consolidated balance sheets. Fees received in connection with servicing loans for others are recognized as earned. Loan servicing costs are charged to expense as incurred. ​ Servicing rights are recognized separately as assets when they are acquired through sales of loans and servicing rights are retained. Servicing rights are initially recorded at fair value with the effect recorded in net gains on sales of mortgage loans in the Consolidated Statements of Income. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. ​ Servicing fee income, which is included in the Consolidated Statements of Income as mortgage servicing income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. ​ Under the fair value measurement method, the Company measures mortgage servicing rights at fair value at each reporting date, reports changes in fair value of servicing assets in earnings in the period in which the changes occur, and includes these changes in mortgage servicing rights mark to market in the Consolidated Statements of Income. The fair values of mortgage servicing rights are subject to significant fluctuations as a result of interest rates, changes in estimated and actual prepayment speeds and default rates and losses. ​ Transfers of Financial Assets – ​ Transfers of a portion of a loan must meet the criteria of a participating interest. If it does not meet the criteria of a participating interest, the transfer must be accounted for as a secured borrowing. In order to meet the criteria for a participating interest, all cash flows from the loan must be divided proportionately, the rights of each loan holder must have the same priority, and the loan holders must have no recourse to the transferor other than standard representations and warranties and no loan holder has the right to pledge or exchange the entire loan. ​ The Company sells financial assets in the normal course of business, the majority of which are related to residential mortgage loan sales through established programs, and commercial loan sales through participation agreements. In accordance with accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing and certain performance-based guarantees, the Company’s continuing involvement with financial assets sold is minimal and generally limited to market customary representation and warranty clauses. ​ When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the servicing right recognized, the consideration received, and any liabilities incurred in exchange for the transferred assets. Upon transfer, any servicing assets and other interests held by the Company are carried at the lower of cost or fair value, with the exception of mortgage servicing rights related to sales of residential mortgage loans, which are carried at fair value. ​ Bank-Owned Life Insurance (“BOLI”) ​ Goodwill and Core Deposit Intangible ​ The Company performed a qualitative assessment of goodwill as of November 30, 2023 which resulted in the fair value of the Company exceeding the carrying value; therefore, it was determined goodwill was not impaired at December 31, 2023. On November 30, 2022, the Company performed a quantitative assessment of goodwill from which we concluded it was more likely than not that goodwill was not impaired as of December 31, 2022. The quantitative assessment was performed as a matter of periodic practice rather than as a response to a qualitative assessment or triggering event. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2023, CDI totaled $11.2 million compared to $13.7 million at December 31, 2022. The total CDI amount reflects the acquisition of West Suburban in 2021 as well as ABC Bank in 2018 and the Talmer Bank branch purchase in 2016. Total CDI amortization expense of $2.5 million, $2.6 million, and $644,000 was recorded in 2023, 2022, and 2021, respectively. The expected future annual amortization expense for each of the next five years (2024-2028) is approximately $2.3 million, $2.1 million, $1.8 million, $1.6 million, and $1.3 million, respectively. ​ Debt Issuance Costs – ​ Loss Contingencies – ​ Noninterest Income ​ Wealth management ​ Service charges on deposits ​ Card related income Advertising Costs ​ Equity Incentive Plan ​ Income Taxes ​ Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income in years in which those temporary differences are expected to be recovered or settled. ​ As of December 31, 2023 and 2022 the Company evaluated tax positions taken for filings with the Internal Revenue Service and all state jurisdictions in which it operates. The Company believes that income tax filing positions will be sustained under examination and does not anticipate any adjustments that would result in a material adverse effect on the Company’s financial condition, results of operations, or cash flows. Accordingly, the Company has not recorded any reserves or related accruals for interest and penalties for uncertain tax positions at December 31, 2023 and 2022. The Company is currently open to audit under the statute of limitations for Federal taxes from 2020 to 2022 and various state jurisdictions from 2018 to 2022. ​ Earnings Per Common Share (“EPS”) ​ Treasury Stock ​ Mortgage Banking Derivatives . ​ Derivative Financial Instruments ​ If it is determined that the derivative instrument is not highly effective as a hedge, hedge accounting is discontinued, and the adjustment to fair value of the derivative instrument is recorded in earnings. For a derivative used to hedge changes in cash flows associated with forecasted transactions, the gain or loss on the effective portion of the derivative is deferred and reported as a component of accumulated other comprehensive income, which is a component of stockholders’ equity, until such time the hedged transaction affects earnings. For derivative instruments not accounted for as hedges, changes in fair value are recognized in noninterest income/expense. Counterparty risk with loan customers is managed through loan covenant agreements and, as such, does not have a significant impact on the fair value of the swaps. Counterparty risk with other banks is managed through bilateral collateralization agreements. Deferred gains and losses from derivatives not accounted for as hedges and that are terminated are amortized over the shorter of the original remaining term of the derivative or the remaining life of the underlying asset or liability. ​ Comprehensive Income ​ Recent Accounting Pronouncements : ​ ASU 2018-16, ASU 2020-04, ASU 2021-01, and ASU 2022-06 Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting. Reference Rate Reform ​ The Company formed a LIBOR transition team in 2019 and developed a project plan to assess the use of alternative indexes and to seek to ensure all financial instruments that reference LIBOR were identified, quantified, and researched for the LIBOR fallback language available or needed. The Company completed the ISDA protocol adherence for LIBOR fallback language for all commercial swaps, met with its commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by the Bank for new loans to ensure appropriate fallback language was included. The Bank discontinued the use of LIBOR as a reference rate for all consumer loans issued after July 31, 2021, and all commercial loans issued after December 31, 2021, with certain exceptions for those loans that were in the process of funding at the end of 2021. The Company’s systems were updated to handle multiple SOFR-based indexes and the Company planned accordingly for the transition of existing LIBOR exposures as the final LIBOR cessation date was June 30, 2023. As of September 30, 2023, the Company’s LIBOR transition processes were determined to be completed and alternative index rates are in place. ASU 2022-01 ​ ASU 2022-02 ​ ASU 2023-06 Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative”. The amendments in this Update modify the disclosure or presentation requirements of a variety of Topics in the Codification. Certain of the amendments represent clarifications to, or technical corrections of, the current requirements. Each amendment in the ASU will only become effective if the SEC removes the related disclosure or presentation requirement from its existing regulations by June 30, 2027. The amendments in this ASU are not expected to have a material impact on the financial statements of the Company. ​ ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures”. (2) The amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which income taxes paid (net of refunds received) is equal to or greater than 5 percent of total income taxes paid (net of refunds received). The amendments also require that all entities disclose the following information: (1) Income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign, (2) Income tax expense (or benefit) from continuing operations disaggregated by federal (national), state, and foreign. The ASU is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments should be applied on a prospective basis. Retrospective application is permitted. The Company will adopt for the reporting period beginning January 1, 2025, and does not expect the amendments to have a material impact to the financial statements of the Company. ​ Subsequent Events ​ On January 16, 2024, the Company’s Board of Directors declared a cash dividend of $0.05 per share payable on February 5, 2024, to stockholders of record as of January 26, 2024.

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2023
Acquisition
Acquisition	Note 2: Acquisition ​ On December 1, 2021, the Company completed its acquisition of West Suburban Bancorp, Inc. ("West Suburban"), a bank holding company, and its wholly owned subsidiary, West Suburban Bank, based in Lombard, Illinois, with operations throughout our existing market footprint. This acquisition brought increased scale and new markets to the Company, and provided new product offerings and line of business opportunities. At closing, the Company acquired $2.94 billion of assets, $1.50 billion of loans, $1.07 billion of securities, and $2.69 billion of deposits, net of fair value adjustments. Under the terms of the merger agreement, each outstanding share of West Suburban common stock was exchanged for 42.413 shares of Company common stock, plus $271.15 of cash. This resulted in merger consideration of $295.2 million, based on the closing price of the Company’s common stock on the date of acquisition, which consisted of 15.7 million shares of the Company’s common stock and $100.7 million of cash. Upon closing of the acquisition, goodwill of $67.7 million associated with the acquisition was recorded by the Company, which was the result of expected synergies, operational efficiencies and other factors. ​ The acquisition of West Suburban has been accounted for as a business combination. We recorded the estimate of fair value based on initial valuations available at December 1, 2021. Estimated fair values which are subject to adjustment for up to one year after December 1, 2021 were considered final as of September 30, 2022. Adjustments and reclasses between deferred tax assets and current taxes receivable, which is reported within other assets, were identified during the quarter ended September 30, 2022 based on further analysis after West Suburban Bank tax filings were made. Deferred tax assets increased $3.7 million, which was offset by a decrease in current taxes receivable of $3.9 million, which resulted in an increase to goodwill of $146,000. None of the $67.9 million of goodwill recorded is expected to be deductible for income tax purposes. The following table provides the purchase price allocation as of the December 1, 2021 merger date of the Company and West Suburban and the assets acquired and liabilities assumed at their estimated fair values as of that date, as recorded by the Company. ​ ​ ​ ​ ​ ​ West Suburban Acquisition Summary As of Date of Acquisition ​ ​ ​ ​ ​ ​ December 1, 2021 Assets ​ ​ ​ Cash and due from banks ​ $ 16,794 Interest bearing deposits with financial institutions ​ ​ 232,880 Securities available-for-sale and held-to maturity, at fair value ​ ​ 1,067,517 FHLBC stock ​ ​ 3,340 Loans, net of allowance for credit losses Day One PCD loan adjustment ​ ​ 1,500,974 Premises and equipment ​ ​ 47,456 Other real estate owned ​ ​ 5,552 Core deposit intangible ​ ​ 14,772 Deferred tax assets ​ ​ 5,819 Other assets ​ ​ 48,838 Total assets ​ $ 2,943,942 ​ ​ ​ ​ Liabilities ​ ​ ​ Noninterest bearing demand ​ $ 1,070,980 Savings, NOW and money market ​ ​ 1,408,051 Time ​ ​ 215,205 Total deposits ​ ​ 2,694,236 Reserve for unfunded commitments ​ ​ 1,787 Other liabilities ​ ​ 20,629 Total liabilities ​ ​ 2,716,652 ​ ​ ​ ​ Cash consideration paid ​ ​ 100,679 Stock issued for acquisition ​ ​ 194,484 Total Liabilities Assumed and Cash and Stock Consideration Paid for Acquisition ​ $ 3,011,815 Goodwill ​ $ 67,873 ​ ​ Expenses related to the West Suburban acquisition totaled $9.1 million and $13.2 million during the year ended December 31, 2022 and 2021, respectively, and are reported within noninterest expense based on the line items impacted, which are primarily salaries and employee benefits, occupancy, furniture and equipment, computer and data processing, legal fees, and other expense in the Consolidated Statements of Income. ​ Purchased loans and leases that reflect a more-than-insignificant deterioration of credit from origination are considered PCD. For PCD loans and leases, the initial estimate of expected credit losses is recognized in the ACL on the date of acquisition using the same methodology as other loans and leases held-for-investment. The following table provides a summary of loans and leases purchased as part of the West Suburban acquisition which were individually evaluated and determined to have credit deterioration at acquisition. ​ ​ ​ ​ ​ ​ ​ As of West Suburban Acquired PCD Loans ​ December 1, 2021 Par value of acquired loans ​ $ 108,241 Allowance for credit losses ​ ​ (12,075) Non-credit discount ​ ​ (1,723) Purchase price of PCD loans at acquisition ​ $ 94,443 ​ ​ The following table presents the carrying amount of all acquired loans as of December 31, 2023 and December 31, 2022, including loans that, as of the acquisition date, had not experienced a more-than-insignificant deterioration in credit quality since origination (“non-PCD loans”): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Acquired Loan Detail ​ As of December 31, 2023 ​ ​ As of December 31, 2022 ​ ​ PCD ​ Non-PCD ​ Total ​ ​ PCD ​ Non-PCD ​ Total West Suburban acquired loans ​ $ 54,123 ​ $ 822,078 ​ $ 876,201 ​ ​ $ 75,396 ​ $ 1,059,363 ​ $ 1,134,759 ABC Bank acquired loans ​ ​ 1,602 ​ ​ 21,556 ​ ​ 23,158 ​ ​ ​ 1,786 ​ ​ 31,895 ​ ​ 33,681 Talmer Bank acquired loans ​ ​ - ​ ​ 12,193 ​ ​ 12,193 ​ ​ ​ - ​ ​ 15,693 ​ ​ 15,693 Total acquired loans net book value ​ $ 55,725 ​ $ 855,827 ​ $ 911,552 ​ ​ $ 77,182 ​ $ 1,106,951 ​ $ 1,184,133 Accretion recorded on acquired loans year to date ​ $ 668 ​ $ 1,684 ​ $ 2,352 ​ ​ $ 848 ​ $ 4,726 ​ $ 5,574 Accretion recorded on acquired unfunded commitments year to date ​ ​ ​ ​ ​ ​ ​ $ 819 ​ ​ ​ ​ ​ ​ ​ ​ $ 893 ​ The Company's operating results for the year ended December 31, 2021 includes the operating results of the acquired assets and assumed liabilities of West Suburban subsequent to the acquisition on December 1, 2021. The following table presents unaudited pro forma information as if the acquisition of West Suburban had occurred on January 1, 2020, under the “Unaudited Pro Forma” columns. The pro forma adjustments give effect to any change in interest income due to the accretion of the discount (premium) associated with the fair value adjustments to acquired loans and leases, any change in interest expense due to estimated premium amortization/discount accretion associated with the fair value adjustment to acquired interest-bearing deposits, and the amortization of the CDI that would have resulted had the deposits been acquired as of January 1, 2020. Pro forma results include Old Second and West Suburban acquisition-related expenses which primarily included, but were not limited to, severance costs, professional services, data processing fees, and advertising expenses totaling $25.1 million for the year ended December 31, 2021. The pro forma information does not necessarily reflect the results of operations that would have occurred had the Company acquired West Suburban on January 1, 2020. Furthermore, cost savings and other business synergies related to the acquisition are not reflected in the pro forma amounts. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unaudited Pro Forma for the Years Ended ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 Net interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 166,495 ​ $ 165,283 Noninterest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 59,036 ​ ​ 48,937 Net income attributable to Old Second Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 67,779 ​ ​ 12,349 ​

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
	Dec. 31, 2023
Cash and Due from Banks.
Cash and Due from Banks	Note 3: Cash and Due from Banks ​ Total cash and cash equivalents were $100.1 million and $115.2 million at December 31, 2023 and 2022, respectively . ​ The nature of the Company’s business requires that it maintain amounts with other banks and federal funds which, at times, may exceed federally insured limits. Management monitors these correspondent relationships, and the Company has not experienced any losses in such accounts. ​

Securities

Securities	12 Months Ended
	Dec. 31, 2023
Securities
Securities	Note 4: Securities ​ The following table summarizes the amortized cost and fair value of the securities portfolio at December 31, 2023 and the corresponding amounts of gross unrealized gains and losses were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2023 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 174,602 ​ $ - ​ $ (5,028) ​ $ 169,574 U.S. government agencies ​ ​ 60,011 ​ ​ - ​ ​ (3,052) ​ ​ 56,959 U.S. government agencies mortgage-backed ​ ​ 118,492 ​ ​ - ​ ​ (12,122) ​ ​ 106,370 States and political subdivisions ​ ​ 238,440 ​ ​ 1,325 ​ ​ (10,430) ​ ​ 229,335 Collateralized mortgage obligations ​ ​ 442,987 ​ ​ 421 ​ ​ (50,864) ​ ​ 392,544 Asset-backed securities ​ ​ 69,248 ​ ​ 42 ​ ​ (3,124) ​ ​ 66,166 Collateralized loan obligations ​ ​ 173,201 ​ ​ 30 ​ ​ (1,350) ​ ​ 171,881 Total securities available-for-sale ​ $ 1,276,981 ​ $ 1,818 ​ $ (85,970) ​ $ 1,192,829 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2022 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 224,054 ​ $ - ​ $ (11,925) ​ $ 212,129 U.S. government agencies ​ ​ 61,178 ​ ​ - ​ ​ (5,130) ​ ​ 56,048 U.S. government agencies mortgage-backed ​ ​ 140,588 ​ ​ - ​ ​ (15,598) ​ ​ 124,990 States and political subdivisions ​ ​ 239,999 ​ ​ 363 ​ ​ (14,234) ​ ​ 226,128 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (378) ​ ​ 9,622 Collateralized mortgage obligations ​ ​ 596,336 ​ ​ 1 ​ ​ (62,569) ​ ​ 533,768 Asset-backed securities ​ ​ 210,388 ​ ​ 6 ​ ​ (8,466) ​ ​ 201,928 Collateralized loan obligations ​ ​ 180,276 ​ ​ - ​ ​ (5,530) ​ ​ 174,746 Total securities available-for-sale ​ $ 1,662,819 ​ $ 370 ​ $ (123,830) ​ $ 1,539,359 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $6.6 million and $6.8 million at December 31, 2023 and December 31, 2022, respectively, that is recorded in other assets on the consolidated balance sheets. ​ FHLBC stock was $18.5 million and $5.6 million at December 31, 2023 and December 31, 2022, respectively. FRBC stock was $14.9 million at December 31, 2023 and December 31, 2022. Our FHLBC stock is necessary to maintain access to FHLBC advances. ​ Securities valued at $810.2 million as of December 31, 2023, were pledged to secure deposits and borrowings, and for other purposes, an increase from $547.8 million at year-end 2022. ​ The fair value, amortized cost and weighted average yield of debt securities at December 31, 2023 by contractual maturity, were as follows in the table below. Securities not due at a single maturity date are shown separately. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Amortized ​ Average ​ ​ Fair ​ Securities available-for-sale Cost Yield ​ Value Due in one year or less ​ $ 150,067 ​ 1.06 % ​ $ 146,728 ​ Due after one year through five years ​ ​ 99,527 ​ 1.36 ​ ​ ​ 94,572 ​ Due after five years through ten years ​ ​ 59,571 ​ 2.92 ​ ​ ​ 55,005 ​ Due after ten years ​ ​ 163,888 ​ 3.11 ​ ​ ​ 159,563 ​ ​ ​ ​ 473,053 ​ 2.07 ​ ​ ​ 455,868 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 561,479 ​ 2.42 ​ ​ ​ 498,914 ​ Asset-backed securities ​ ​ 69,248 ​ 4.35 ​ ​ ​ 66,166 ​ Collateralized loan obligations ​ ​ 173,201 ​ 7.14 ​ ​ ​ 171,881 ​ Total securities available-for-sale ​ $ 1,276,981 ​ 3.03 % ​ $ 1,192,829 ​ ​ As of December 31, 2023, the Company has no securities issued from one originator, other than the U.S. Government and its agencies, that individually amounted to over 10% of the Company’s stockholders equity. ​ Securities with unrealized losses with no corresponding allowance for credit losses at December 31, 2023 and 2022 aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair Securities available-for-sale Securities Losses Value Securities Losses Value Securities Losses Value U.S. Treasuries ​ - ​ $ - ​ $ - ​ 4 ​ $ 5,028 ​ $ 169,574 ​ 4 ​ $ 5,028 ​ $ 169,574 U.S. government agencies ​ - ​ ​ - ​ ​ - ​ 9 ​ ​ 3,052 ​ ​ 56,959 ​ 9 ​ ​ 3,052 ​ ​ 56,959 U.S. government agencies mortgage-backed ​ - ​ ​ - ​ ​ - ​ 128 ​ ​ 12,122 ​ ​ 106,370 ​ 128 ​ ​ 12,122 ​ ​ 106,370 States and political subdivisions ​ 12 ​ ​ 137 ​ ​ 27,974 ​ 27 ​ ​ 10,293 ​ ​ 108,408 ​ 39 ​ ​ 10,430 ​ ​ 136,382 Collateralized mortgage obligations ​ 2 ​ ​ 8 ​ ​ 734 ​ 143 ​ ​ 50,856 ​ ​ 376,236 ​ 145 ​ ​ 50,864 ​ ​ 376,970 Asset-backed securities ​ - ​ ​ - ​ ​ - ​ 17 ​ ​ 3,124 ​ ​ 61,671 ​ 17 ​ ​ 3,124 ​ ​ 61,671 Collateralized loan obligations ​ - ​ ​ - ​ ​ - ​ 25 ​ ​ 1,350 ​ ​ 150,902 ​ 25 ​ ​ 1,350 ​ ​ 150,902 Total securities available-for-sale ​ 14 ​ $ 145 ​ $ 28,708 ​ 353 ​ $ 85,825 ​ $ 1,030,120 ​ 367 ​ $ 85,970 ​ $ 1,058,828 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair Securities available-for-sale Securities Losses ​ Value Securities Losses ​ Value Securities Losses ​ Value U.S. Treasuries ​ 1 ​ $ 1,025 ​ $ 24,121 ​ 4 ​ $ 10,900 ​ $ 188,008 ​ 5 ​ $ 11,925 ​ $ 212,129 U.S. government agencies ​ - ​ ​ - ​ ​ - ​ 9 ​ ​ 5,130 ​ ​ 56,048 ​ 9 ​ ​ 5,130 ​ ​ 56,048 U.S. government agencies mortgage-backed ​ 15 ​ ​ 975 ​ ​ 11,369 ​ 117 ​ ​ 14,623 ​ ​ 113,621 ​ 132 ​ ​ 15,598 ​ ​ 124,990 States and political subdivisions ​ 45 ​ ​ 5,800 ​ ​ 128,770 ​ 15 ​ ​ 8,434 ​ ​ 48,877 ​ 60 ​ ​ 14,234 ​ ​ 177,647 Corporate bonds ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 378 ​ ​ 9,622 ​ 2 ​ ​ 378 ​ ​ 9,622 Collateralized mortgage obligations ​ 80 ​ ​ 12,895 ​ ​ 180,624 ​ 120 ​ ​ 49,674 ​ ​ 348,880 ​ 200 ​ ​ 62,569 ​ ​ 529,504 Asset-backed securities ​ 30 ​ ​ 3,030 ​ ​ 121,915 ​ 21 ​ ​ 5,436 ​ ​ 79,659 ​ 51 ​ ​ 8,466 ​ ​ 201,574 Collateralized loan obligations ​ 23 ​ ​ 3,579 ​ ​ 112,772 ​ 11 ​ ​ 1,951 ​ ​ 61,974 ​ 34 ​ ​ 5,530 ​ ​ 174,746 Total securities available-for-sale ​ 194 ​ $ 27,304 ​ $ 579,571 ​ 299 ​ $ 96,526 ​ $ 906,689 ​ 493 ​ $ 123,830 ​ $ 1,486,260 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale debt securities in unrealized loss positions are evaluated for allowance related to credit losses at least quarterly. he analysis consists of screening all securities to determine if the bonds have market value loss exceeding 5% of book value and if that loss exceeds $200,000 . Two other aspects of each security are assessed. The first is whether a security carries a government guarantee. If the security is backed by a 100% U.S. Government or U.S. Agency guarantee, then no allowance for credit loss would be considered necessary, since ultimately principal and interest of the investment would be paid. For securities that carried a U.S. Government guarantee of less than 100% , an allowance for credit loss analysis is performed. In the case of a partial government guarantee, the loss amount is assumed to be the percentage not guaranteed multiplied by the gain or loss on the position. In addition, a calculation is performed to estimate the amount of value change attributable to movements in interest rates. If the devaluation of a security is largely due to rate changes, then no allowance would be considered necessary. However, if a payment collected on a particular bond is less than the expected amount, individual credit analysis is conducted on that position. Furthermore, for positions whose market valuations are not directly attributable to movements in interest rates, even if all scheduled payments have been received, credit analysis is performed on each position. ​ The following table presents net realized gains (losses) on securities available-for-sale for the years ended: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ ​ December 31, ​ Securities available-for-sale 2023 2022 2021 ​ Proceeds from sales of securities ​ $ 205,738 ​ $ 30,981 ​ $ 605,846 ​ Gross realized gains on securities ​ - ​ - ​ 270 ​ Gross realized losses on securities ​ (4,148) ​ (944) ​ (38) ​ Net realized (losses) gains ​ $ (4,148) ​ $ (944) ​ $ 232 ​ Income tax benefit (expense) on net realized (losses) gains ​ $ 1,117 ​ $ 265 ​ $ (65) ​ Effective tax rate applied ​ ​ 26.9 % ​ 28.1 % ​ 28.0 ​ ​

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	12 Months Ended
	Dec. 31, 2023
Loans and Allowance for Credit Losses on Loans
Loans and Allowance for Credit Losses on Loans	​ ​ ​ Note 5: Loans and Allowance for Credit Losses on Loans ​ The composition of loans by portfolio segment as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 December 31, 2022 Commercial ​ $ 841,697 ​ $ 840,964 Leases ​ ​ 398,223 ​ ​ 277,385 Commercial real estate – investor ​ ​ 1,034,424 ​ ​ 987,635 Commercial real estate – owner occupied ​ ​ 796,538 ​ ​ 854,879 Construction ​ ​ 165,380 ​ ​ 180,535 Residential real estate – investor ​ ​ 52,595 ​ ​ 57,353 Residential real estate – owner occupied ​ ​ 226,248 ​ ​ 219,718 Multifamily ​ ​ 401,696 ​ ​ 323,691 HELOC ​ ​ 103,237 ​ ​ 109,202 Other 1 ​ ​ 22,915 ​ ​ 18,247 Total loans ​ ​ 4,042,953 ​ ​ 3,869,609 Allowance for credit losses on loans ​ ​ (44,264) ​ ​ (49,480) Net loans 2 ​ $ 3,998,689 ​ $ 3,820,129 ​ 1 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 5 - Loans and Allowance for Credit Losses on Loans. ​ 2 Excludes accrued interest receivable of $ 20.5 million and $15.9 million at December 31, 2023 and December 31, 2022, respectively, which is recorded in other assets on the consolidated balance sheets. ​ The methodologies used for calculating the ACL on each loan segment include (i) a migration analysis for commercial, CRE owner occupied, CRE investor, and multifamily segments; (ii) a static pool analysis for construction, residential investor, residential owner occupied and the HELOC segments; and (iii) a WARM (weighted average remaining maturity) methodology is used for lease financing receivables and consumer segments. The forecast period used for each segment calculation was one year, with an immediate reversion to historical loss rates following this one year period. The economic factors management has selected include the civilian unemployment rate and real gross domestic product supplemented with local unemployment factors. These factors are evaluated and updated quarterly. Additionally, management uses qualitative adjustments to the loss estimates in certain cases as determined necessary. These qualitative adjustments are applied by pooled loan segment and have been made for both increased and decreased risk due to loan quality trends, collateral risk, or other risks management determines are not adequately captured in loss estimation. Loans that do not share risk characteristics are evaluated on an individual basis and excluded from the pooled loan evaluation. The amount of expected loss for loans analyzed individually is determined by discounted cash flow or the fair value of the underlying collateral less applicable costs to sell. ​ It is the policy of the Company to review each prospective credit prior to making a loan in order to determine if an adequate level of security or collateral has been obtained. The type of collateral, when required, will vary from liquid assets to real estate. The Company’s access to collateral, in the event of borrower default, is assured through adherence to lending laws, the Company’s lending standards and credit monitoring procedures. Although the Bank makes loans primarily within its market area, there are no significant concentrations of loans where the customers’ ability to honor loan terms is dependent upon a single economic sector. The real estate related categories above represent 68.8% and 70.6% of the portfolio at December 31, 2023 and December 31, 2022, respectively, and include a mix of owner and non-owner occupied commercial real estate, residential, construction and multifamily loans. ​ ​ The following tables represent the activity in the ACL for loans for the years ended December 31, 2023, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses January 1, 2023 Credit Losses Charge-offs Recoveries December 31, 2023 Commercial ​ $ 11,968 ​ $ (7,717) ​ $ 885 ​ $ 632 ​ $ 3,998 Leases ​ ​ 2,865 ​ ​ 850 ​ ​ 882 ​ ​ 119 ​ ​ 2,952 Commercial real estate – investor ​ ​ 10,674 ​ ​ 18,170 ​ ​ 11,816 ​ ​ 77 ​ ​ 17,105 Commercial real estate – owner occupied ​ ​ 15,001 ​ ​ 7,941 ​ ​ 10,691 ​ ​ 29 ​ ​ 12,280 Construction ​ ​ 1,546 ​ ​ (608) ​ ​ - ​ ​ 100 ​ ​ 1,038 Residential real estate – investor ​ ​ 768 ​ ​ (129) ​ ​ - ​ ​ 30 ​ ​ 669 Residential real estate – owner occupied ​ ​ 2,046 ​ ​ (304) ​ ​ - ​ ​ 79 ​ ​ 1,821 Multifamily ​ ​ 2,453 ​ ​ 275 ​ ​ - ​ ​ - ​ ​ 2,728 HELOC ​ ​ 1,806 ​ ​ (255) ​ ​ - ​ ​ 105 ​ ​ 1,656 Other ​ ​ 353 ​ ​ (137) ​ ​ 368 ​ ​ 169 ​ ​ 17 Total ​ $ 49,480 ​ $ 18,086 ​ $ 24,642 ​ $ 1,340 ​ $ 44,264 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending Allowance for credit losses ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance ​ January 1, 2022 Credit Losses Charge-offs Recoveries December 31, 2022 Commercial ​ $ 11,751 ​ $ 273 ​ $ 151 ​ $ 95 ​ $ 11,968 Leases ​ ​ 3,480 ​ ​ (246) ​ ​ 371 ​ ​ 2 ​ ​ 2,865 Commercial real estate – investor ​ ​ 10,795 ​ ​ 1,199 ​ ​ 1,401 ​ ​ 81 ​ ​ 10,674 Commercial real estate – owner occupied ​ ​ 4,913 ​ ​ 10,117 ​ ​ 133 ​ ​ 104 ​ ​ 15,001 Construction ​ ​ 3,373 ​ ​ (1,827) ​ ​ - ​ ​ - ​ ​ 1,546 Residential real estate – investor ​ ​ 760 ​ ​ (22) ​ ​ - ​ ​ 30 ​ ​ 768 Residential real estate – owner occupied ​ ​ 2,832 ​ ​ (1,010) ​ ​ 2 ​ ​ 226 ​ ​ 2,046 Multifamily ​ ​ 3,675 ​ ​ (1,285) ​ ​ - ​ ​ 63 ​ ​ 2,453 HELOC ​ ​ 2,510 ​ ​ (844) ​ ​ - ​ ​ 140 ​ ​ 1,806 Other ​ ​ 192 ​ ​ 395 ​ ​ 402 ​ ​ 168 ​ ​ 353 Total ​ $ 44,281 ​ $ 6,750 ​ $ 2,460 ​ $ 909 ​ $ 49,480 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ ​ Impact of Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ ​ WSB Acquisition (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses January 1, 2021 ​ with PCD Loans Credit Losses Charge-offs Recoveries December 31, 2021 Commercial ​ $ 2,812 ​ ​ 7,161 ​ $ 2,389 ​ $ 963 ​ $ 352 ​ $ 11,751 Leases ​ ​ 3,888 ​ ​ - ​ ​ (339) ​ ​ 69 ​ ​ - ​ ​ 3,480 Commercial real estate – Investor ​ ​ 7,899 ​ ​ 1,877 ​ ​ 3,665 ​ ​ 2,724 ​ ​ 78 ​ ​ 10,795 Commercial real estate – Owner occupied ​ ​ 3,557 ​ ​ 2,771 ​ ​ 147 ​ ​ 1,797 ​ ​ 235 ​ ​ 4,913 Construction ​ ​ 4,054 ​ ​ 102 ​ ​ (783) ​ ​ - ​ ​ - ​ ​ 3,373 Residential real estate – Investor ​ ​ 1,740 ​ ​ 23 ​ ​ (1,294) ​ ​ - ​ ​ 291 ​ ​ 760 Residential real estate – Owner occupied ​ ​ 2,714 ​ ​ 136 ​ ​ (176) ​ ​ - ​ ​ 158 ​ ​ 2,832 Multifamily ​ ​ 3,625 ​ ​ - ​ ​ 233 ​ ​ 183 ​ ​ - ​ ​ 3,675 HELOC ​ ​ 1,948 ​ ​ 5 ​ ​ 340 ​ ​ 17 ​ ​ 234 ​ ​ 2,510 Other ​ ​ 1,618 ​ ​ - ​ ​ (1,387) ​ ​ 180 ​ ​ 141 ​ ​ 192 Total ​ $ 33,855 ​ $ 12,075 ​ $ 2,795 ​ $ 5,933 ​ $ 1,489 ​ $ 44,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table presents the collateral dependent loans and the related ACL allocated by segment of loans as of December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2023 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 837 ​ $ 797 ​ $ - ​ $ - ​ $ 1,634 ​ $ 2 Leases ​ ​ - ​ ​ - ​ ​ 321 ​ ​ - ​ ​ 321 ​ ​ 320 Commercial real estate – investor ​ ​ 15,735 ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,735 ​ ​ 3,656 Commercial real estate – owner occupied ​ ​ 34,894 ​ ​ - ​ ​ - ​ ​ - ​ ​ 34,894 ​ ​ 3,900 Construction ​ ​ 7,162 ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,162 ​ ​ - Residential real estate – investor ​ ​ 422 ​ ​ - ​ ​ - ​ ​ - ​ ​ 422 ​ ​ - Residential real estate – owner occupied ​ ​ 1,506 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,506 ​ ​ - Multifamily ​ ​ 1,402 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,402 ​ ​ - HELOC ​ ​ 39 ​ ​ - ​ ​ - ​ ​ - ​ ​ 39 ​ ​ - Total ​ $ 61,997 ​ $ 797 ​ $ 321 ​ $ - ​ $ 63,115 ​ $ 7,878 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2022 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 883 ​ $ 5,915 ​ $ - ​ $ 364 ​ $ 7,162 ​ $ 569 Leases ​ ​ - ​ ​ - ​ ​ 1,248 ​ ​ - ​ ​ 1,248 ​ ​ 1,248 Commercial real estate – investor ​ ​ 16,576 ​ ​ - ​ ​ - ​ ​ - ​ ​ 16,576 ​ ​ 2,875 Commercial real estate – owner occupied ​ ​ 19,188 ​ ​ - ​ ​ - ​ ​ 2,310 ​ ​ 21,498 ​ ​ 5,808 Residential real estate – investor ​ ​ 675 ​ ​ - ​ ​ - ​ ​ - ​ ​ 675 ​ ​ - Residential real estate – owner occupied ​ ​ 1,817 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,817 ​ ​ 244 Multifamily ​ ​ 1,322 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,322 ​ ​ - HELOC ​ ​ 180 ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - Total ​ $ 40,641 ​ $ 5,915 ​ $ 1,248 ​ $ 2,674 ​ $ 50,478 ​ $ 10,744 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Aged analysis of past due loans by class of loans as of December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2023 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ $982 ​ $ - ​ $ $1,228 ​ $ $2,210 ​ $ 839,487 ​ $ 841,697 ​ $ 1,155 Leases ​ ​ 599 ​ ​ - ​ ​ 347 ​ ​ 946 ​ ​ 397,277 ​ ​ 398,223 ​ ​ - Commercial real estate – investor ​ ​ 1,209 ​ ​ - ​ ​ 6,087 ​ ​ 7,296 ​ ​ 1,027,128 ​ ​ 1,034,424 ​ ​ - Commercial real estate – owner occupied ​ ​ 2,103 ​ ​ 3,726 ​ ​ 15,645 ​ ​ 21,474 ​ ​ 775,064 ​ ​ 796,538 ​ ​ - Construction ​ ​ 2,540 ​ ​ 307 ​ ​ 7,161 ​ ​ 10,008 ​ ​ 155,372 ​ ​ 165,380 ​ ​ - Residential real estate – investor ​ ​ 540 ​ ​ 579 ​ ​ 168 ​ ​ 1,287 ​ ​ 51,308 ​ ​ 52,595 ​ ​ - Residential real estate – owner occupied ​ ​ 553 ​ ​ 125 ​ ​ 1,944 ​ ​ 2,622 ​ ​ 223,626 ​ ​ 226,248 ​ ​ - Multifamily ​ ​ 1,085 ​ ​ - ​ ​ 233 ​ ​ 1,318 ​ ​ 400,378 ​ ​ 401,696 ​ ​ - HELOC ​ ​ 565 ​ ​ 1,396 ​ ​ 269 ​ ​ 2,230 ​ ​ 101,007 ​ ​ 103,237 ​ ​ 41 Other ​ ​ - ​ ​ 1 ​ ​ - ​ ​ 1 ​ ​ 22,914 ​ ​ 22,915 ​ ​ - Total ​ $ 10,176 ​ $ 6,134 ​ $ 33,082 ​ $ 49,392 ​ $ 3,993,561 ​ $ 4,042,953 ​ $ 1,196 ​ Aged analysis of past due loans by class of loans as of December 31, 2022 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2022 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3 ​ $ 1,012 ​ $ 825 ​ $ 1,840 ​ $ 839,124 ​ $ 840,964 ​ $ 460 Leases ​ ​ 447 ​ ​ 22 ​ ​ 614 ​ ​ 1,083 ​ ​ 276,302 ​ ​ 277,385 ​ ​ - Commercial real estate – investor ​ ​ 3,276 ​ ​ 1,276 ​ ​ 4,315 ​ ​ 8,867 ​ ​ 978,768 ​ ​ 987,635 ​ ​ - Commercial real estate – owner occupied ​ ​ 373 ​ ​ 113 ​ ​ 2,211 ​ ​ 2,697 ​ ​ 852,182 ​ ​ 854,879 ​ ​ 173 Construction ​ ​ 14 ​ ​ - ​ ​ 116 ​ ​ 130 ​ ​ 180,405 ​ ​ 180,535 ​ ​ - Residential real estate – investor ​ ​ 445 ​ ​ - ​ ​ 987 ​ ​ 1,432 ​ ​ 55,921 ​ ​ 57,353 ​ ​ 144 Residential real estate – owner occupied ​ ​ 1,191 ​ ​ - ​ ​ 2,232 ​ ​ 3,423 ​ ​ 216,295 ​ ​ 219,718 ​ ​ 485 Multifamily ​ ​ 267 ​ ​ 361 ​ ​ 1,322 ​ ​ 1,950 ​ ​ 321,741 ​ ​ 323,691 ​ ​ - HELOC ​ ​ 291 ​ ​ 90 ​ ​ 392 ​ ​ 773 ​ ​ 108,429 ​ ​ 109,202 ​ ​ - Other ​ ​ 19 ​ ​ - ​ ​ - ​ ​ 19 ​ ​ 18,228 ​ ​ 18,247 ​ ​ - Total ​ $ 6,326 ​ $ 2,874 ​ $ 13,014 ​ $ 22,214 ​ $ 3,847,395 ​ $ 3,869,609 ​ $ 1,262 ​ ​ ​ ​ The following table presents all nonaccrual loans and loans on nonaccrual for which there was no related allowance for credit losses as of: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nonaccrual loan detail December 31, 2023 With no ACL December 31, 2022 With no ACL Commercial ​ $ 870 ​ $ 870 ​ $ 7,189 ​ $ 6,598 Leases ​ ​ 639 ​ ​ 318 ​ ​ 1,876 ​ ​ - Commercial real estate – investor ​ ​ 16,572 ​ ​ 8,926 ​ ​ 4,346 ​ ​ 4,244 Commercial real estate – owner occupied ​ ​ 34,946 ​ ​ 8,429 ​ ​ 8,050 ​ ​ 3,813 Construction ​ ​ 7,162 ​ ​ 7,162 ​ ​ 251 ​ ​ - Residential real estate – investor ​ ​ 1,331 ​ ​ 1,331 ​ ​ 1,528 ​ ​ 675 Residential real estate – owner occupied ​ ​ 3,078 ​ ​ 3,078 ​ ​ 3,713 ​ ​ 1,572 Multifamily ​ ​ 1,775 ​ ​ 1,775 ​ ​ 2,538 ​ ​ 1,322 HELOC ​ ​ 1,210 ​ ​ 1,210 ​ ​ 2,109 ​ ​ 180 Other ​ ​ - ​ ​ - ​ ​ 2 ​ ​ - Total ​ $ 67,583 ​ $ 33,099 ​ $ 31,602 ​ $ 18,404 ​ The Company recognized $1.9 million of interest on nonaccrual loans during the year ended December 31, 2023. The amount of accrued interest reversed against interest income totaled ​ Credit Quality Indicators: ​ The Company categorizes loans into credit risk categories based on current financial information, overall debt service coverage, comparison against industry averages, historical payment experience, and current economic trends. This analysis includes loans with outstanding balances or commitments greater than $50,000 and excludes homogeneous loans such as home equity lines of credit and residential mortgages. Loans with a classified risk rating are reviewed quarterly regardless of size or loan type. The Company uses the following definitions for classified risk ratings: ​ Special Mention. ​ Substandard. ​ Doubtful. ​ Credits that are not covered by the definitions above are pass credits, which are not considered to be adversely rated. ​ ​ Credit quality indicators by class of loans as of December 31, 2023 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 318,569 ​ $ 136,668 ​ $ 35,901 ​ $ 11,983 ​ $ 18,390 ​ $ 3,426 ​ $ 298,931 ​ $ 1,408 ​ $ 825,276 Special Mention ​ ​ - ​ ​ 2,737 ​ ​ 707 ​ ​ 171 ​ ​ - ​ ​ - ​ ​ 4,392 ​ ​ - ​ ​ 8,007 Substandard ​ ​ - ​ ​ 2,099 ​ ​ 146 ​ ​ - ​ ​ 199 ​ ​ - ​ ​ 5,970 ​ ​ - ​ ​ 8,414 Total commercial ​ ​ 318,569 ​ ​ 141,504 ​ ​ 36,754 ​ ​ 12,154 ​ ​ 18,589 ​ ​ 3,426 ​ ​ 309,293 ​ ​ 1,408 ​ ​ 841,697 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 219,163 ​ ​ 113,074 ​ $ 42,275 ​ ​ 14,663 ​ ​ 6,975 ​ ​ 1,255 ​ ​ - ​ ​ - ​ ​ 397,405 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 407 ​ ​ 203 ​ ​ - ​ ​ 208 ​ ​ - ​ ​ - ​ ​ - ​ ​ 818 Total leases ​ ​ 219,163 ​ ​ 113,481 ​ ​ 42,478 ​ ​ 14,663 ​ ​ 7,183 ​ ​ 1,255 ​ ​ - ​ ​ - ​ ​ 398,223 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 159,654 ​ ​ 367,512 ​ ​ 218,084 ​ ​ 108,384 ​ ​ 54,322 ​ ​ 63,281 ​ ​ 8,122 ​ ​ - ​ ​ 979,359 Special Mention ​ ​ - ​ ​ - ​ ​ 11,267 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 11,267 Substandard ​ ​ - ​ ​ - ​ ​ 838 ​ ​ 5,327 ​ ​ 15,658 ​ ​ 9,648 ​ ​ 12,327 ​ ​ - ​ ​ 43,798 Total commercial real estate – investor ​ ​ 159,654 ​ ​ 367,512 ​ ​ 230,189 ​ ​ 113,711 ​ ​ 69,980 ​ ​ 72,929 ​ ​ 20,449 ​ ​ - ​ ​ 1,034,424 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 124,059 ​ ​ 134,383 ​ ​ 177,553 ​ ​ 103,109 ​ ​ 42,839 ​ ​ 91,062 ​ ​ 33,243 ​ ​ - ​ ​ 706,248 Special Mention ​ ​ 1,650 ​ ​ 17,415 ​ ​ 9,585 ​ ​ 3,128 ​ ​ 218 ​ ​ 3,681 ​ ​ - ​ ​ - ​ ​ 35,677 Substandard ​ ​ - ​ ​ 14,630 ​ ​ 18,817 ​ ​ 4,571 ​ ​ 14,809 ​ ​ 1,786 ​ ​ - ​ ​ - ​ ​ 54,613 Total commercial real estate – owner occupied ​ ​ 125,709 ​ ​ 166,428 ​ ​ 205,955 ​ ​ 110,808 ​ ​ 57,866 ​ ​ 96,529 ​ ​ 33,243 ​ ​ - ​ ​ 796,538 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 42,808 ​ ​ 66,513 ​ ​ 32,942 ​ ​ 100 ​ ​ 1,593 ​ ​ 1,083 ​ ​ 3,186 ​ ​ - ​ ​ 148,225 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 9,993 ​ ​ - ​ ​ 7,162 ​ ​ - ​ ​ - ​ ​ 17,155 Total construction ​ ​ 42,808 ​ ​ 66,513 ​ ​ 32,942 ​ ​ 10,093 ​ ​ 1,593 ​ ​ 8,245 ​ ​ 3,186 ​ ​ - ​ ​ 165,380 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 5,062 ​ ​ 14,434 ​ ​ 9,027 ​ ​ 6,227 ​ ​ 6,508 ​ ​ 8,469 ​ ​ 1,471 ​ ​ - ​ ​ 51,198 Special Mention ​ ​ - ​ ​ - ​ ​ 66 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 66 Substandard ​ ​ - ​ ​ 390 ​ ​ - ​ ​ - ​ ​ 408 ​ ​ 533 ​ ​ - ​ ​ - ​ ​ 1,331 Total residential real estate – investor ​ ​ 5,062 ​ ​ 14,824 ​ ​ 9,093 ​ ​ 6,227 ​ ​ 6,916 ​ ​ 9,002 ​ ​ 1,471 ​ ​ - ​ ​ 52,595 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 32,574 ​ ​ 41,528 ​ ​ 40,335 ​ ​ 25,322 ​ ​ 14,233 ​ ​ 68,277 ​ ​ 763 ​ ​ - ​ ​ 223,032 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 191 ​ ​ 685 ​ ​ 2,340 ​ ​ - ​ ​ - ​ ​ 3,216 Total residential real estate – owner occupied ​ ​ 32,574 ​ ​ 41,528 ​ ​ 40,335 ​ ​ 25,513 ​ ​ 14,918 ​ ​ 70,617 ​ ​ 763 ​ ​ - ​ ​ 226,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 55,310 ​ ​ 79,060 ​ ​ 123,834 ​ ​ 72,539 ​ ​ 12,231 ​ ​ 40,825 ​ ​ 562 ​ ​ - ​ ​ 384,361 Special Mention ​ ​ - ​ ​ 168 ​ ​ 13,425 ​ ​ 322 ​ ​ 1,645 ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,560 Substandard ​ ​ - ​ ​ 1,009 ​ ​ - ​ ​ - ​ ​ - ​ ​ 766 ​ ​ - ​ ​ - ​ ​ 1,775 Total multifamily ​ ​ 55,310 ​ ​ 80,237 ​ ​ 137,259 ​ ​ 72,861 ​ ​ 13,876 ​ ​ 41,591 ​ ​ 562 ​ ​ - ​ ​ 401,696 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,735 ​ ​ 2,679 ​ ​ 490 ​ ​ 1,757 ​ ​ 1,756 ​ ​ 2,995 ​ ​ 89,161 ​ ​ - ​ ​ 101,573 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 25 ​ ​ 1 ​ ​ 41 ​ ​ 24 ​ ​ 184 ​ ​ 1,389 ​ ​ - ​ ​ 1,664 Total HELOC ​ ​ 2,735 ​ ​ 2,704 ​ ​ 491 ​ ​ 1,798 ​ ​ 1,780 ​ ​ 3,179 ​ ​ 90,550 ​ ​ - ​ ​ 103,237 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 4,060 ​ ​ 2,278 ​ ​ 1,569 ​ ​ 153 ​ ​ 85 ​ ​ 73 ​ ​ 14,697 ​ ​ - ​ ​ 22,915 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Total other ​ ​ 4,060 ​ ​ 2,278 ​ ​ 1,569 ​ ​ 153 ​ ​ 85 ​ ​ 73 ​ ​ 14,697 ​ ​ - ​ ​ 22,915 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 963,994 ​ ​ 958,129 ​ ​ 682,010 ​ ​ 344,237 ​ ​ 158,932 ​ ​ 280,746 ​ ​ 450,136 ​ ​ 1,408 ​ ​ 3,839,592 Special Mention ​ ​ 1,650 ​ ​ 20,320 ​ ​ 35,050 ​ ​ 3,621 ​ ​ 1,863 ​ ​ 3,681 ​ ​ 4,392 ​ ​ - ​ ​ 70,577 Substandard ​ ​ - ​ ​ 18,560 ​ ​ 20,005 ​ ​ 20,123 ​ ​ 31,991 ​ ​ 22,419 ​ ​ 19,686 ​ ​ - ​ ​ 132,784 Total loans ​ $ 965,644 ​ $ 997,009 ​ $ 737,065 ​ $ 367,981 ​ $ 192,786 ​ $ 306,846 ​ $ 474,214 ​ $ 1,408 ​ $ 4,042,953 ​ Credit quality indicators by class of loans as of December 31, 2022 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 222,856 ​ $ 72,808 ​ $ 21,597 ​ $ 12,742 ​ $ 6,957 ​ $ 2,651 ​ $ 447,821 ​ $ - ​ $ 787,432 Special Mention ​ ​ 1,701 ​ ​ 446 ​ ​ 1,182 ​ ​ 2,432 ​ ​ - ​ ​ - ​ ​ 21,286 ​ ​ - ​ ​ 27,047 Substandard ​ ​ - ​ ​ 2,447 ​ ​ 3,139 ​ ​ 12,176 ​ ​ 4,807 ​ ​ - ​ ​ 3,916 ​ ​ - ​ ​ 26,485 Total commercial ​ ​ 224,557 ​ ​ 75,701 ​ ​ 25,918 ​ ​ 27,350 ​ ​ 11,764 ​ ​ 2,651 ​ ​ 473,023 ​ ​ - ​ ​ 840,964 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 161,379 ​ ​ 64,203 ​ $ 26,995 ​ ​ 17,653 ​ ​ 4,449 ​ ​ 830 ​ ​ - ​ ​ - ​ ​ 275,509 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 1,606 ​ ​ - ​ ​ - ​ ​ 270 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,876 Total leases ​ ​ 162,985 ​ ​ 64,203 ​ ​ 26,995 ​ ​ 17,923 ​ ​ 4,449 ​ ​ 830 ​ ​ - ​ ​ - ​ ​ 277,385 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 382,311 ​ ​ 229,155 ​ ​ 133,215 ​ ​ 76,846 ​ ​ 46,935 ​ ​ 51,995 ​ ​ 7,113 ​ ​ - ​ ​ 927,570 Special Mention ​ ​ - ​ ​ 6,766 ​ ​ 5,490 ​ ​ 10,206 ​ ​ 1,070 ​ ​ 9,123 ​ ​ - ​ ​ - ​ ​ 32,655 Substandard ​ ​ - ​ ​ 71 ​ ​ - ​ ​ 25,042 ​ ​ - ​ ​ 2,297 ​ ​ - ​ ​ - ​ ​ 27,410 Total commercial real estate – investor ​ ​ 382,311 ​ ​ 235,992 ​ ​ 138,705 ​ ​ 112,094 ​ ​ 48,005 ​ ​ 63,415 ​ ​ 7,113 ​ ​ - ​ ​ 987,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 168,776 ​ ​ 223,731 ​ ​ 105,669 ​ ​ 47,351 ​ ​ 49,597 ​ ​ 87,357 ​ ​ 33,745 ​ ​ - ​ ​ 716,226 Special Mention ​ ​ - ​ ​ 22,242 ​ ​ 48,184 ​ ​ 17,668 ​ ​ 8,661 ​ ​ 1,008 ​ ​ - ​ ​ - ​ ​ 97,763 Substandard ​ ​ 2,309 ​ ​ 15,182 ​ ​ 1,191 ​ ​ 17,865 ​ ​ 853 ​ ​ 3,490 ​ ​ - ​ ​ - ​ ​ 40,890 Total commercial real estate – owner occupied ​ ​ 171,085 ​ ​ 261,155 ​ ​ 155,044 ​ ​ 82,884 ​ ​ 59,111 ​ ​ 91,855 ​ ​ 33,745 ​ ​ - ​ ​ 854,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 52,508 ​ ​ 66,308 ​ ​ 39,542 ​ ​ 2,390 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 163,905 Special Mention ​ ​ - ​ ​ - ​ ​ 15,297 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,297 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,198 ​ ​ - ​ ​ 135 ​ ​ - ​ ​ - ​ ​ 1,333 Total construction ​ ​ 52,508 ​ ​ 66,308 ​ ​ 54,839 ​ ​ 3,588 ​ ​ 226 ​ ​ 1,543 ​ ​ 1,523 ​ ​ - ​ ​ 180,535 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 14,659 ​ ​ 9,910 ​ ​ 6,945 ​ ​ 8,585 ​ ​ 4,853 ​ ​ 9,626 ​ ​ 991 ​ ​ - ​ ​ 55,569 Special Mention ​ ​ - ​ ​ 70 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 70 Substandard ​ ​ 621 ​ ​ - ​ ​ - ​ ​ 499 ​ ​ 186 ​ ​ 408 ​ ​ - ​ ​ - ​ ​ 1,714 Total residential real estate – investor ​ ​ 15,280 ​ ​ 9,980 ​ ​ 6,945 ​ ​ 9,084 ​ ​ 5,039 ​ ​ 10,034 ​ ​ 991 ​ ​ - ​ ​ 57,353 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 41,885 ​ ​ 44,884 ​ ​ 28,418 ​ ​ 16,146 ​ ​ 12,152 ​ ​ 70,741 ​ ​ 1,638 ​ ​ - ​ ​ 215,864 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 22 ​ ​ 237 ​ ​ 968 ​ ​ 131 ​ ​ 2,496 ​ ​ - ​ ​ - ​ ​ 3,854 Total residential real estate – owner occupied ​ ​ 41,885 ​ ​ 44,906 ​ ​ 28,655 ​ ​ 17,114 ​ ​ 12,283 ​ ​ 73,237 ​ ​ 1,638 ​ ​ - ​ ​ 219,718 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 76,877 ​ ​ 126,257 ​ ​ 52,262 ​ ​ 13,125 ​ ​ 39,703 ​ ​ 6,098 ​ ​ 329 ​ ​ - ​ ​ 314,651 Special Mention ​ ​ 377 ​ ​ 3,683 ​ ​ 342 ​ ​ 1,684 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,086 Substandard ​ ​ 1,684 ​ ​ - ​ ​ - ​ ​ - ​ ​ 587 ​ ​ 683 ​ ​ - ​ ​ - ​ ​ 2,954 Total multifamily ​ ​ 78,938 ​ ​ 129,940 ​ ​ 52,604 ​ ​ 14,809 ​ ​ 40,290 ​ ​ 6,781 ​ ​ 329 ​ ​ - ​ ​ 323,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,760 ​ ​ 517 ​ ​ 1,497 ​ ​ 1,703 ​ ​ 657 ​ ​ 2,288 ​ ​ 97,258 ​ ​ - ​ ​ 106,680 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 111 ​ ​ - ​ ​ 111 Substandard ​ ​ 62 ​ ​ 1 ​ ​ - ​ ​ - ​ ​ 67 ​ ​ 309 ​ ​ 1,972 ​ ​ - ​ ​ 2,411 Total HELOC ​ ​ 2,822 ​ ​ 518 ​ ​ 1,497 ​ ​ 1,703 ​ ​ 724 ​ ​ 2,597 ​ ​ 99,341 ​ ​ - ​ ​ 109,202 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 4,195 ​ ​ 2,835 ​ ​ 432 ​ ​ 167 ​ ​ 69 ​ ​ 111 ​ ​ 10,436 ​ ​ - ​ ​ 18,245 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 1 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1 ​ ​ - ​ ​ 2 Total other ​ ​ 4,195 ​ ​ 2,835 ​ ​ 433 ​ ​ 167 ​ ​ 69 ​ ​ 111 ​ ​ 10,437 ​ ​ - ​ ​ 18,247 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,128,206 ​ ​ 840,608 ​ ​ 416,572 ​ ​ 196,708 ​ ​ 165,598 ​ ​ 233,105 ​ ​ 600,854 ​ ​ - ​ ​ 3,581,651 Special Mention ​ ​ 2,078 ​ ​ 33,207 ​ ​ 70,495 ​ ​ 31,990 ​ ​ 9,731 ​ ​ 10,131 ​ ​ 21,397 ​ ​ - ​ ​ 179,029 Substandard ​ ​ 6,282 ​ ​ 17,723 ​ ​ 4,568 ​ ​ 58,018 ​ ​ 6,631 ​ ​ 9,818 ​ ​ 5,889 ​ ​ - ​ ​ 108,929 Total loans ​ $ 1,136,566 ​ $ 891,538 ​ $ 491,635 ​ $ 286,716 ​ $ 181,960 ​ $ 253,054 ​ $ 628,140 ​ $ - ​ $ 3,869,609 ​ ​ ​ ​ The gross charge-offs activity by loan type and year of origination for the year ended December 31, 2023 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current period gross charge-offs 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ $ - ​ ​ - ​ ​ 466 ​ ​ 364 ​ ​ - ​ ​ 55 ​ $ - ​ $ - ​ $ 885 Leases ​ ​ - ​ ​ 870 ​ ​ - ​ ​ - ​ ​ 12 ​ ​ - ​ ​ - ​ ​ - ​ ​ 882 Commercial real estate – investor ​ ​ 123 ​ ​ 8,352 ​ ​ 71 ​ ​ 3,270 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 11,816 Commercial real estate – owner occupied ​ ​ - ​ ​ 22 ​ ​ 178 ​ ​ 6,947 ​ ​ 3,512 ​ ​ 32 ​ ​ - ​ ​ - ​ ​ 10,691 Construction ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Residential real estate – investor ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Residential real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Multifamily ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - HELOC ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Other ​ ​ - ​ ​ 3 ​ ​ 27 ​ ​ 6 ​ ​ - ​ ​ 332 ​ ​ - ​ ​ - ​ ​ 368 Total ​ $ 123 ​ $ 9,247 ​ $ 742 ​ $ 10,587 ​ $ 3,524 ​ $ 419 ​ ​ - ​ ​ - ​ $ 24,642 ​ The Company had $170,000 and $600,000 in consumer mortgage loans in the process of foreclosure as of December 31, 2023 and December 31, 2022, respectively. ​ As of January 1, 2023, the Company prospectively adopted ASU 2022-02, Topic 326 “Troubled Debt Restructuring (“TDRs”) and Vintage Disclosures”, see Note 1. Eighteen loans, totaling $41.7 million in aggregate, were modified which were experiencing financial difficulty during the year ended December 31, 2023. None of the loans modified under ASU 2022-02 are in payment default as of December 31, 2023. ​ The following table presents the amortized costs basis of loans at December 31, 2023 that were both experiencing financial difficulty and modified during the year ended December 31, 2023 by class and by type of modification. The percentage of the amortized cost basis of loans that were modified to borrowers in financial distress as compared to amortized costs basis of each class of financing receivable is also presented below. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Term Extension ​ Combination - Term Extension and Interest Rate Reduction ​ Combination - Term Extension and Payment Delay ​ Total Loans Modified ​ % of Total Loan Segment Modified to Total Loan Segment Commercial ​ $ 3,000 ​ $ 979 ​ $ - ​ $ 3,979 ​ 0.5% Commercial real estate – investor ​ ​ 13,521 ​ ​ - ​ ​ 7,646 ​ ​ 21,167 ​ 2.0% Commercial real estate – owner occupied ​ ​ 16,082 ​ ​ - ​ ​ - ​ ​ 16,082 ​ 2.0% Residential real estate – owner occupied ​ ​ 119 ​ ​ - ​ ​ - ​ ​ 119 ​ 0.1% Multifamily ​ ​ 233 ​ ​ - ​ ​ - ​ ​ 233 ​ 0.1% HELOC ​ ​ 166 ​ ​ - ​ ​ - ​ ​ 166 ​ 0.2% Total ​ $ 33,121 ​ $ 979 ​ $ 7,646 ​ $ 41,746 ​ 1.0% ​ The Company closely monitors the performance of loan modifications to borrowers experiencing financial difficulty. The following table presents the performance of loans that have been modified as of December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ 30-59 days past due ​ 60-89 Days Past Due ​ 90 Days or Greater Past Due ​ Total Past Due ​ Current ​ Total Loan Modified Commercial ​ $ - ​ $ - ​ $ 979 ​ $ 979 ​ $ 3,000 ​ $ 3,979 Commercial real estate – investor ​ ​ 838 ​ ​ - ​ ​ - ​ ​ 838 ​ ​ 20,329 ​ ​ 21,167 Commercial real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 16,082 ​ ​ 16,082 Residential real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 119 ​ ​ 119 Multifamily ​ ​ - ​ ​ - ​ ​ 233 ​ ​ 233 ​ ​ - ​ ​ 233 HELOC ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 166 ​ ​ 166 Total ​ $ 838 ​ $ - ​ $ 1,212 ​ $ 2,050 ​ $ 39,696 ​ $ 41,746 ​ The following table summarizes the financial effect of the loan modifications presented above to borrowers experiencing financial difficulty for the period ended December 31, 2023. The Company had one Commercial real estate – investor loan that had a payment modification from principal and interest to interest only until maturity. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Weighted-Average Term Extension (In Months) ​ Weighted-Average Interest Rate Change ​ Weighted-Average Delay of Payment (In Months) Commercial ​ ​ 8.31 ​ ​ 5.00 % ​ ​ - Commercial real estate – investor ​ ​ 9.96 ​ ​ - ​ ​ ​ 7.00 Commercial real estate – owner occupied ​ ​ 11.65 ​ ​ - ​ ​ ​ - Residential real estate – owner occupied ​ ​ 39.00 ​ ​ - ​ ​ ​ - Multifamily ​ ​ 21.00 ​ ​ - ​ ​ ​ - HELOC ​ ​ 24.00 ​ ​ - ​ ​ ​ - Total ​ ​ 10.65 ​ ​ 5.00 % ​ ​ 7.00 ​ Loans to principal officers, directors, and their affiliates, which are made in the ordinary course of business, as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Beginning balance ​ $ 8,483 ​ $ 10,162 ​ New loans, including acquired related party loans ​ 30 ​ 267 ​ Repayments and other reductions ​ (30) ​ (1,946) ​ Change in related party status ​ (8,483) ​ - ​ Ending balance ​ $ - ​ $ 8,483 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2023
Other Real Estate Owned
Other Real Estate Owned	Note 6: Other Real Estate Owned ​ Details related to the activity in the other real estate owned (“OREO”) portfolio, net of valuation reserve, for the periods presented are itemized in the following table. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, Other real estate owned 2023 2022 ​ 2021 Balance at beginning of period ​ $ 1,561 ​ $ 2,356 ​ $ 2,474 Property additions, net of acquisition adjustments ​ ​ 5,580 ​ ​ 87 ​ ​ 5,748 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and gains/losses ​ ​ 1,749 ​ ​ 778 ​ ​ 5,787 Period valuation write-down ​ ​ 269 ​ ​ 104 ​ ​ 79 Balance at end of period ​ $ 5,123 ​ $ 1,561 ​ $ 2,356 ​ ​ ​ Activity in the valuation allowance was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2023 2022 2021 Balance at beginning of period ​ $ 856 ​ $ 1,179 ​ $ 1,643 Provision for unrealized losses ​ ​ 269 ​ ​ 104 ​ ​ 79 Reductions taken on sales ​ ​ (1,007) ​ ​ (427) ​ ​ (543) Balance at end of period ​ $ 118 ​ $ 856 ​ $ 1,179 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expenses related to OREO, net of lease revenue includes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2023 2022 ​ 2021 Gain on sales, net ​ $ (256) ​ $ (163) ​ $ (41) Provision for unrealized losses ​ ​ 269 ​ ​ 104 ​ ​ 79 Operating expenses ​ ​ 434 ​ ​ 193 ​ ​ 133 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 48 ​ ​ 4 ​ ​ 4 Net OREO expense ​ $ 399 ​ $ 130 ​ $ 167 ​

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2023
Premises and Equipment
Premises and Equipment	Note 7: Premises and Equipment ​ Premises and equipment at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ ​ Land ​ $ 29,741 ​ $ - ​ $ 29,741 ​ $ 29,741 ​ $ - ​ $ 29,741 ​ ​ Buildings ​ 58,311 ​ 25,911 ​ 32,400 ​ 54,075 ​ 24,427 ​ 29,648 ​ ​ Leasehold improvements ​ 7,785 ​ 1,574 ​ 6,211 ​ 2,790 ​ 1,280 ​ 1,510 ​ ​ Furniture and equipment ​ 57,447 ​ 46,489 ​ 10,958 ​ 58,183 ​ ​ 46,727 ​ 11,456 ​ ​ Total Premises and Equipment ​ $ 153,284 ​ $ 73,974 ​ $ 79,310 ​ $ 144,789 ​ $ 72,434 ​ $ 72,355 ​ ​ ​ The Company had $1.0 million and $4.6 million of fixed assets held for sale as of December 31, 2023 and 2022, respectively. These fixed assets held for sale are reported with other assets on the Consolidated Balance Sheets.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2023
Deposits
Deposits	Note 8: Deposits ​ Major classifications of deposits at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Noninterest bearing demand ​ $ 1,834,891 ​ $ 2,051,702 ​ Savings ​ ​ 971,334 ​ ​ 1,145,592 ​ NOW accounts ​ ​ 565,375 ​ ​ 609,338 ​ Money market accounts ​ ​ 671,240 ​ ​ 862,170 ​ Certificates of deposit of less than $100,000 ​ ​ 266,035 ​ ​ 244,017 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 180,289 ​ ​ 157,438 ​ Certificates of deposit of more than $250,000 ​ ​ 81,582 ​ ​ 40,466 ​ Total deposits ​ $ 4,570,746 ​ $ 5,110,723 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company had $30.7 million and $37.0 million in listing service deposits as of December 31, 2023 and 2022, respectively. Deposits held by senior officers and directors, including their related interests, totaled $12.0 million and $13.8 million as of December 31, 2023 and 2022, respectively. ​ At December 31, 2023, scheduled maturities of time deposits were as follows: ​ ​ ​ ​ ​ ​ 2024 $ 435,491 ​ 2025 ​ 63,409 ​ 2026 ​ 15,097 ​ 2027 ​ 5,401 ​ 2028 ​ 8,508 ​ Total time deposits ​ $ 527,906 ​ ​

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2023
Borrowings
Borrowings	Note 9: Borrowings ​ The following table is a summary of borrowings as of December 31, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Securities sold under repurchase agreements ​ ​ $ 26,470 ​ $ 32,156 ​ Other short-term borrowings ​ ​ ​ 405,000 ​ ​ 90,000 ​ Junior subordinated debentures 1 ​ ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ ​ 59,382 ​ ​ 59,297 ​ Senior notes ​ ​ ​ - ​ ​ 44,585 ​ Notes payable and other borrowings ​ ​ ​ - ​ ​ 9,000 ​ Total borrowings ​ ​ $ 516,625 ​ $ 260,811 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 See Note 10: Junior Subordinated Debentures, below. ​ The Company enters into deposit sweep transactions where the transaction amounts are secured by pledged securities. These transactions consistently mature within 1 to 90 days from the transaction date and are governed by sweep repurchase agreements. All sweep repurchase agreements are treated as financings secured by U.S. government agencies, collateralized mortgage obligations, mortgage-backed securities and/or highly-rated issues of State and political subdivisions, and had a carrying amount of $26.5 million and $32.2 million at December 31, 2023 and 2022, respectively. The fair value of the pledged collateral was $45.7 million and $71.4 million at December 31, 2023 and December 31, 2022, respectively. At December 31, 2023, there were no customers with secured balances exceeding 10% of stockholders’ equity. ​ The Company’s borrowings at the FHLBC require the Bank to be a member and invest in the stock of the FHLBC. Total borrowings are generally limited to the lower of 35% of total assets or 60% of the book value of certain mortgage loans. As of December 31, 2023, the Bank had $405.0 million in short-term advances outstanding under the FHLBC. There were $90.0 million in short-term advances as of December 31, 2022. The Bank assumed $23.4 million of long-term FHLBC advances with our ABC Bank acquisition in 2018. The remaining balance of $5.9 million at December 31, 2021 was paid off in full during the second quarter of 2022. FHLBC stock held at December 31, 2023 was valued at $18.5 million, and any potential FHLBC advances were collateralized by loans and securities with a principal balance of $1.46 billion, which carried a FHLBC-calculated combined value of $1.00 billion. As of December 31, 2022, FHLBC stock owned by the Bank was valued at $5.6 million and the principal balance of loans pledged was $969.1 million. Based on the total amount of loans and securities pledged, the Bank had a total borrowing capacity at the FHLBC of $1.00 billion and a remaining funding availability of $599.9 million on December 31, 2023. ​ In the second quarter of 2021, we entered into Subordinated Note Purchase Agreements with certain qualified institutional buyers pursuant to which we sold and issued $60.0 million in aggregate principal amount of our 3.50% Fixed-to-Floating Rate Subordinated Notes due April 15, 2031 (the “Notes”). We sold the Notes to eligible purchasers in a private offering, and the proceeds of this issuance are intended to be used for general corporate purposes, which may include, without limitation, the redemption of existing senior debt, common stock repurchases and strategic acquisitions. The Notes bear interest at a fixed annual rate of 3.50% through April 14, 2026, payable semi-annually in arrears. As of April 15, 2026 forward, the interest rate on the Notes will generally reset quarterly to a rate equal to Three-Month Term SOFR (as defined by the Note) plus 273 basis points, payable quarterly in arrears. The Notes have a stated maturity of April 15, 2031, and are redeemable, in whole are in part, on April 15, 2026, or any interest payment date thereafter, and at any time upon the occurrence of certain events. The subordinated debentures outstanding, net of deferred issuance costs, totaled $59.4 million and $59.3 million as of December 31, 2023 and 2022, respectively. ​ The Company issued senior notes in December 2016 with a ten-year maturity, and terms included interest payable semiannually at 5.75% for five years. Beginning December 31, 2021, the senior debt began to pay interest at a floating rate, with interest payable quarterly at three month LIBOR plus 385 basis points. The notes were redeemable, in whole or in part, at the option of the Company, beginning with the interest payment date on December 31, 2021, and on any floating rate interest payment date thereafter, at a redemption price equal to 100% of the principal amount of the notes plus accrued and unpaid interest. On June 30, 2023, the Company redeemed all of the $45.0 million senior notes. The interest rate at June 30, 2023 and December 31, 2022 was 9.39% and 8.62%, respectively. Upon redemption, the related deferred debt issuance costs of $362,000 was also recorded as interest expense, resulting in an effective cost of this debt issuance of 12.85% for the second quarter of 2023. ​ On February 24, 2020, the Company originated a $20.0 million three-year term note with a correspondent bank. The term note was issued at one-month LIBOR plus 175 basis points, and required principal payments quarterly and interest payments monthly. This note was included within Notes payable and other borrowings on the Consolidated Balance Sheets, and the remaining $9.0 million balance of the note was paid off on February 24, 2023. The note payable carried an interest rate of 6.32% at maturity. The Company also has an undrawn line of credit of $30.0 million with a correspondent bank to be used for short-term funding needs; advances under this line can be outstanding up to 360 days from the date of issuance. This line of credit has not been utilized since early 2019. ​ Scheduled maturities and weighted average rates of borrowings for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2023 ​ $ - - % $ 131,156 ​ 2.89 % 2024 ​ ​ 431,470 ​ 4.98 ​ ​ - - ​ 2025 ​ - - ​ - - ​ 2026 ​ - - ​ 44,585 ​ 6.02 ​ 2027 ​ - - ​ - - ​ 2028 ​ - - ​ - ​ - ​ Thereafter ​ 85,155 4.10 ​ 85,070 3.91 ​ Total borrowings ​ $ 516,625 4.84 % $ 260,811 3.76 % ​

Junior Subordinated Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2023
Junior Subordinated Debentures.
Junior Subordinated Debentures	Note 10: Junior Subordinated Debentures ​ The Company issued $25.0 million of cumulative trust preferred securities through a private placement completed by an additional, unconsolidated subsidiary, Old Second Capital Trust II, in April 2007. These trust preferred securities mature in 30 years, but subject to regulatory approval, can be called in whole or in part on a quarterly basis commencing June 15, 2017. The quarterly cash distributions on the securities were fixed at 6.77% through June 15, 2017, distributions subsequently moved to a floating rate of 150 basis points over three-month LIBOR, and finally 150 basis points over three-month SOFR following the sunset of LIBOR. Upon conversion to a floating rate, a cash flow hedge was initiated which resulted in the total interest rate paid on the debt of 4.46% and 4.42% as of December 31, 2023 and 2022, respectively. The Company issued a new $25.8 million subordinated debenture to the Old Second Capital Trust II in return for the aggregate net proceeds of this trust preferred offering. The interest rate and payment frequency on the debenture are equivalent to the cash distribution basis on the trust preferred securities. ​ The junior subordinated debentures issued by the Company are disclosed on the Consolidated Balance Sheets, and the related interest expense for each issuance is included in the Consolidated Statements of Income. As of December 31, 2023 and 2022, the remaining unamortized debt issuance costs related to the junior subordinated debentures were less than $1,000 and are included as a reduction to the balance of the junior subordinated debentures on the Consolidated Balance Sheets. The remaining deferred issuance costs on the junior subordinated debentures related to the issuance of Old Second Capital Trust II will be amortized to interest expense over the remainder of the 30-year term of the notes and are included in the Consolidated Statements of Income. ​

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2023
Income Taxes
Income Taxes	Note 11: Income Taxes ​ Income tax expense (benefit) for the years ending December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Current federal ​ $ 20,724 ​ $ 13,241 ​ $ 750 Current state ​ ​ 10,098 ​ ​ 6,209 ​ ​ 594 Deferred federal ​ ​ 1,964 ​ ​ 3,338 ​ ​ 4,445 Deferred state ​ ​ (107) ​ ​ 1,356 ​ ​ 2,034 Total income tax expense ​ $ 32,679 ​ $ 24,144 ​ $ 7,823 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following were the components of the deferred tax assets and liabilities as of December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Accrued bonus ​ $ 2,500 ​ $ 2,700 Allowance for credit losses ​ ​ 13,077 ​ ​ 15,591 Deferred compensation ​ ​ 1,622 ​ ​ 1,292 Stock based compensation ​ ​ 1,768 ​ ​ 1,257 Business combination adjustments ​ ​ 270 ​ ​ 1,138 Lease liability ​ ​ 3,201 ​ ​ 682 Other assets ​ ​ 1,602 ​ ​ 939 Total deferred tax assets ​ ​ 24,040 ​ ​ 23,599 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (5,454) ​ ​ (4,107) Goodwill amortization/impairment ​ ​ (465) ​ ​ (229) Mortgage servicing rights ​ ​ (2,842) ​ ​ (3,103) Amortization of core deposit intangible ​ ​ (2,987) ​ ​ (3,673) Right of use asset ​ ​ (1,969) ​ ​ (682) Acquired securities ​ ​ (2,376) ​ ​ (1,921) Other liabilities ​ ​ (1,263) ​ ​ (1,343) Total deferred tax liabilities ​ ​ (17,356) ​ ​ (15,058) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 6,684 ​ ​ 8,541 Tax effect of adjustments related to other comprehensive income ​ ​ 24,393 ​ ​ 36,209 Net deferred tax asset ​ $ 31,077 ​ $ 44,750 ​ ​ ​ ​ ​ ​ ​ ​ At December 31, 2023, the Company had no federal net operating loss carryforward and no state net operating loss carryforward. ​ Effective tax rates differ from federal statutory rates applied to financial statement income (loss) for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Tax at statutory federal income tax rate ​ $ 26,126 ​ $ 19,225 ​ $ 5,852 Nontaxable interest income, net of disallowed interest deduction ​ ​ (947) ​ ​ (1,097) ​ ​ (1,069) BOLI income ​ ​ (445) ​ ​ (151) ​ ​ (292) State income taxes, net of federal benefit ​ ​ 7,911 ​ ​ 6,091 ​ ​ 2,054 Stock based compensation ​ ​ (132) ​ ​ (43) ​ ​ 54 Transaction costs ​ ​ - ​ ​ - ​ ​ 396 Other, net ​ ​ 166 ​ ​ 119 ​ ​ 828 Total tax at effective tax rate ​ $ 32,679 ​ $ 24,144 ​ $ 7,823 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company evaluated positive and negative evidence in order to determine if it was more likely than not that the deferred tax asset would be recovered through future income. Significant positive evidence evaluated included recent and projected earnings, strong asset quality and an improved capital position. No significant negative evidence was noted.

Equity Compensation Plans

Equity Compensation Plans	12 Months Ended
	Dec. 31, 2023
Equity Compensation Plans
Equity Compensation Plans	Note 12: Equity Compensation Plans ​ Stock-based awards are outstanding under the Company’s 2019 Equity Incentive Plan, as amended and restated (the “2019 Plan”). The 2019 Plan was originally approved at the May 2019 annual stockholders’ meeting and authorized 600,000 shares, and at the May 2021 annual stockholders’ meeting, the Company obtained stockholder approval to increase the number of shares of common stock authorized for issuance under the plan by 1,200,000 shares, from 600,000 shares to 1,800,000 shares. Following the approval of the 2019 Plan, no further awards will be granted under any other prior plan. ​ The 2019 Plan authorizes the granting of qualified stock options, non-qualified stock options, restricted stock, restricted stock units, and stock appreciation rights (“SARs”). Awards may be granted to selected directors, officers, employees or eligible service providers under the 2019 Plan at the discretion of the Compensation Committee of the Company’s Board of Directors. As of December 31, 2023, 990,178 shares remained available for issuance under the 2019 Plan. ​ The Company has granted only restricted stock units under the 2019 Equity Incentive Plan. ​ Generally, restricted stock and restricted stock units granted under the 2019 Plan vest three years from the grant date, but the Compensation Committee of the Company’s Board of Directors has discretionary authority to change the terms of particular awards including the vesting schedule. ​ Under the 2019 Plan, unless otherwise provided in an award agreement, upon the occurrence of a change in control, all stock options and SARs then held by the participant will become fully exercisable immediately, and all stock awards and cash incentive awards will become fully earned and vested immediately if, (i) the 2019 Plan is not an obligation of the successor entity following a change in control or (ii) the 2019 Plan is an obligation of the successor entity following a change in control and the participant incurs a termination of service without cause or for good reason following the change in control. Notwithstanding the immediately preceding sentence, if the vesting of an award is conditioned upon the achievement of performance measures, then such vesting will generally be subject to the following: if, at the time of the change in control, the performance measures are less than 50% attained (pro rata based upon the time of the period through the change in control), the award will become vested and exercisable on a fractional basis with the numerator being equal to the percentage of attainment and the denominator being 50%; and if, at the time of the change in control, the performance measures are at least 50% attained (pro rata based upon the time of the period through the change in control), the award will become fully earned and vested immediately upon the change in control. ​ Awards of restricted stock units under the 2019 Plan generally entitled holders to voting and dividend rights upon grant and are subject to forfeiture until certain restrictions have lapsed including employment for a specific period. Awards of restricted stock units under the 2019 Plan are also subject to forfeiture until certain restrictions have lapsed including employment for a specific period, but do not entitle holders to voting rights until the restricted period ends and shares are transferred in connection with the units. ​ Total compensation cost that has been charged for the 2019 Plan was $3.6 million, $3.0 million and $1.4 million for the years ending December 31, 2023, 2022 and 2021 respectively. ​ There were 240,149 and 279,838 restricted stock units granted during the years ending December 31, 2023 and 2022, respectively. Compensation expense is recognized over the vesting period of the restricted stock unit based on the market value of the award on the grant date. A summary of changes in the Company’s unvested restricted awards for the years ending December 31, 2023, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 649,210 ​ $ 12.84 Granted ​ 240,149 ​ ​ 17.02 Vested ​ (150,464) ​ ​ 12.56 Forfeited ​ (29,658) ​ ​ 14.14 Unvested at December 31 ​ 709,237 ​ $ 14.26 ​ ​ ​ ​ ​ ​ ​ Total unrecognized compensation cost of restricted stock unit awards was $4.0 million as of December 31, 2023, which is expected to be recognized over a weighted-average period of 1.70 years. ​

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2023
Earnings Per Share
Earnings Per Share	Note 13: Earnings Per Share ​ The earnings per share, both basic and diluted, are included below as of December 31, (in thousands except for per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,663,722 ​ ​ 44,526,655 ​ ​ 30,208,663 Net income ​ ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Basic earnings per share ​ ​ $ 2.05 ​ $ 1.51 ​ $ 0.66 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,663,722 ​ ​ 44,526,655 ​ ​ 30,208,663 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 731,288 ​ ​ 686,433 ​ ​ 529,199 Diluted average common shares outstanding ​ ​ ​ 45,395,010 ​ ​ 45,213,088 ​ ​ 30,737,862 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Diluted earnings per share ​ ​ $ 2.02 ​ $ 1.49 ​ $ 0.65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments

Commitments	12 Months Ended
	Dec. 31, 2023
Commitments
Commitments	Note 14: Commitments ​ In the normal course of business, there are outstanding commitments that are not reflected in the Consolidated Financial Statements. Commitments include financial instruments that involve, to varying degrees, elements of credit, interest rate, and liquidity risk. In management’s opinion, these do not represent unusual risks and management does not anticipate significant losses as a result of these transactions. The Company uses the same credit policies in making commitments and conditional obligations for borrowers as it does for on-balance sheet instruments. ​ The following table is a summary of financial instrument commitments as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 173 ​ $ 16,621 ​ $ 16,794 ​ $ 3,514 ​ $ 15,365 ​ $ 18,879 ​ Performance standby ​ ​ 562 ​ ​ 13,689 ​ ​ 14,251 ​ ​ 3,161 ​ ​ 13,989 ​ ​ 17,150 ​ ​ ​ ​ 735 ​ ​ 30,310 ​ ​ 31,045 ​ ​ 6,675 ​ ​ 29,354 ​ ​ 36,029 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 735 ​ $ 30,377 ​ $ 31,112 ​ $ 6,675 ​ $ 29,421 ​ $ 36,096 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 140,305 ​ $ 694,960 ​ $ 835,265 ​ $ 139,070 ​ $ 860,255 ​ $ 999,325 ​ ​ The Bank occupies facilities under long-term operating leases, some of which include provisions for future rent increases. In addition, the Company leases space at sites that house automatic teller machines (ATMs). The Company also receives rental income on certain leased properties. As of December 31, 2023, aggregate future minimum rental income to be received under noncancelable leases totaled $442,000. Total facility net operating lease expense or revenue recorded under all operating leases was a net expense of $844,000 in 2023, $396,000 in 2022, and $361,000 in 2021. Total ATM lease expense, including the costs related to servicing those ATM’s, was $2.1 million in 2023, $1.9 million in 2022, and $1.2 million in 2021. ​ ​ The following table below is the estimated aggregate minimum annual rental commitments at December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2029 ​ 2024 ​ 2025 ​ 2026 ​ 2027 ​ 2028 ​ and thereafter Rental commitment $ 1,179 ​ $ 1,021 ​ $ 811 ​ $ 770 ​ $ 769 ​ $ 1,023 ​ Legal proceedings ​ The Company and its subsidiaries, from time to time, pursue collection suits and other actions that arise in the ordinary course of business against their borrowers and are defendants in legal actions arising from normal business activities. Management, after consultation with legal counsel, believes that the ultimate liabilities, if any, resulting from these actions will not have a material adverse effect on the financial position of the Bank or on the consolidated financial position of the Company based on all known information at this time.

Regulatory & Capital Matters

Regulatory & Capital Matters	12 Months Ended
	Dec. 31, 2023
Regulatory & Capital Matters
Regulatory & Capital Matters	Note 15: Regulatory & Capital Matters ​ The Bank is subject to the risk-based capital regulatory guidelines, which include the methodology for calculating the risk-weighted Bank assets, developed by the Office of the Comptroller of the Currency (the “OCC”) and the other bank regulatory agencies. In connection with the current economic environment, the Bank’s current level of nonperforming assets and the risk-based capital guidelines, the Bank’s board of directors’ guidelines are for the Bank to maintain a Tier 1 leverage capital ratio at or above eight percent (8%) and a total risk-based capital ratio at or above twelve percent (12%). The Bank currently exceeds those thresholds. ​ Bank holding companies are required to maintain minimum levels of capital in accordance with capital guidelines implemented by the Board of Governors of the Federal Reserve System. The general bank and holding company capital adequacy guidelines in force as of the periods reported are shown in the accompanying table, as are the capital ratios of the Company and the Bank, as of December 31, 2023, and December 31, 2022. ​ In July 2013, the U.S. federal banking authorities issued final rules (the “Basel III Rules”) establishing more stringent regulatory capital requirements for U.S. banking institutions, which went into effect on January 1, 2015. A detailed discussion of the Basel III Rules is included in Part I, Item 1 of the annual report under the heading “Supervision and Regulation.” ​ The Company and the Bank are subject to regulatory capital requirements administered by federal banking agencies. The capital ratios below are calculated pursuant to the capital requirements in effect for the periods reported below. ​ Capital levels and industry defined regulatory minimum required levels at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ Adequacy with Capital ​ Under Prompt Corrective ​ ​ ​ Actual ​ Conservation Buffer, if applicable 1 ​ Action Provisions 2 ​ ​ Amount Ratio Amount Ratio Amount Ratio ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 547,721 ​ 11.37 % ​ $ 337,207 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 12.32 ​ ​ ​ 336,598 ​ 7.00 ​ ​ $ 312,556 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 677,076 ​ 14.06 ​ ​ ​ 505,640 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 636,768 ​ 13.24 ​ ​ ​ 504,990 ​ 10.50 ​ ​ ​ 480,943 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 572,721 ​ 11.89 ​ ​ ​ 409,430 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 12.32 ​ ​ ​ 408,727 ​ 8.50 ​ ​ ​ 384,684 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 572,721 ​ 10.06 ​ ​ ​ 227,722 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 10.41 ​ ​ ​ 227,632 ​ 4.00 ​ ​ ​ 284,540 ​ 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 457,206 ​ 9.67 % ​ $ 330,966 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 11.70 ​ ​ ​ 330,498 ​ 7.00 ​ ​ $ 306,891 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 592,039 ​ 12.52 ​ ​ ​ 496,518 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 602,237 ​ 12.75 ​ ​ ​ 495,960 ​ 10.50 ​ ​ ​ 472,343 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 482,206 ​ 10.20 ​ ​ ​ 401,838 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 11.70 ​ ​ ​ 401,319 ​ 8.50 ​ ​ ​ 377,712 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 482,206 ​ 8.14 ​ ​ ​ 236,956 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 9.32 ​ ​ ​ 237,083 ​ 4.00 ​ ​ ​ 296,354 ​ 5.00 ​ ​ 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. 2 The prompt corrective action provisions are only applicable at the Bank level. The Bank exceeded the general minimum regulatory requirements to be considered “well capitalized.” ​ As part of its response to the impact of the COVID-19 pandemic, in the first quarter of 2020, U.S. federal regulatory authorities issued an interim final rule that provided banking organizations that adopted CECL during the 2020 calendar year with the option to delay for two years the estimated impact of CECL on regulatory capital relative to regulatory capital determined under the prior incurred loss methodology, followed by a three-year transition period to phase out the aggregate amount of the capital benefit provided during the initial two-year delay (i.e., a five-year transition in total). In connection with our adoption of CECL on January 1, 2020, we elected to utilize the five-year CECL transition. The cumulative amount that is not recognized in regulatory capital, in addition to the $3.8 million Day 1 impact of CECL adoption, will be phased in at 25% per year beginning January 1, 2022. As of December 31, 2023, the capital measures of the Company exclude $1.9 million, which is the Day 1 impact to retained earnings and 50% of the increase in the allowance for credit losses during 2020 and 2021, excluding PCD loans and acquisition related adjustments. ​ Dividend Restrictions ​ In addition to the above requirements, banking regulations and capital guidelines generally limit the amount of dividends that may be paid by a Bank without prior regulatory approval. Under these regulations, the amount of dividends that may be paid in any calendar year is limited to the current year’s profits, combined with the retained profit of the previous two years, subject to the capital requirements described above. As of December 31, 2023, the Company had total dividend availability of $60.4 million from the Bank, per regulatory guidelines. Pursuant to the Basel III rules that were fully phased-in at January 1, 2019, the Bank must keep a capital conservation buffer of 2.5% on all risk-based capital requirements in order to avoid additional limitations on capital distributions.

Mortgage Banking Derivatives

Mortgage Banking Derivatives	12 Months Ended
	Dec. 31, 2023
Mortgage Banking Derivatives.
Mortgage Banking Derivatives
Mortgage Banking Derivatives	Note 16: Mortgage Banking Derivatives ​ Commitments to fund certain mortgage loans (interest rate locks) to be sold into the secondary market and forward commitments for the future delivery of mortgage loans to third party investors are considered derivatives. It is the Company’s practice to sell mortgage-backed securities (“MBS”) contracts for the future delivery to economically hedge the effect of changes in interest rates resulting from its commitments to fund the loans. These contracts are also derivatives and collectively with the forward commitments for the future delivery of mortgage loans are considered forward contracts. These mortgage banking derivatives, which are not designated in hedge relationships using the accepted accounting for derivative instruments and hedging activities at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 6,000 ​ $ 2,750 ​ Fair value ​ (46) ​ 20 ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 1,312 ​ $ 2,548 ​ Fair value ​ 36 ​ 56 ​ ​ Fair values were estimated based on changes in mortgage interest rates from the date of the commitments. The Company sold $52.1 million in loans to investors receiving proceeds of $52.2 million and resulting in a gain on sale of $1.5 million for the year ended December 31, 2023. Sales to investors included $30.5 million, or 60.0% to FNMA and $9.8 million, or 19.3%, to FHLMC for the year ended December 31, 2023. No other individual investor was sold more than 10% of the total loans sold.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements
Fair Value Measurements	​ Note 17: Fair Value Measurements ​ Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The fair value hierarchy established by the Company also requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. Three levels of inputs that may be used to measure fair value are: ​ Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets that the Company has the ability to access as of the measurement date. ​ Level 2: Significant observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, and other inputs that are observable or can be corroborated by observable market data. ​ Level 3: Significant unobservable inputs that reflect a company’s own view about the assumptions that market participants would use in pricing an asset or liability. ​ During the period ending December 31, 2023, $14.9 million of asset-backed securities and $6.8 million of collateralized mortgage obligations were transferred to Level 2 from Level 3. During the period ending December 31, 2022, $15.0 million of asset-backed securities and $6.8 million of collateralized mortgage obligations were transferred to Level 3 from Level 2. These transfers are due to lack of sufficient market activity in 2022 to provide observable inputs. ​ The majority of securities are valued by external pricing services or dealer market participants and are classified in Level 2 of the fair value hierarchy. Both market and income valuation approaches are utilized. Quarterly, the Company evaluates the methodologies used by the external pricing services or dealer market participants to develop the fair values to determine whether the results of the valuations are representative of an exit price in the Company’s principal markets and an appropriate representation of fair value. The Company uses the following methods and significant assumptions to estimate fair value: ​ ● Government-sponsored agency debt securities are primarily priced using available market information through processes such as benchmark spreads, market valuations of like securities, like securities groupings and matrix pricing. ● Other government-sponsored agency securities, MBS and some of the actively traded real estate mortgage investment conduits and collateralized mortgage obligations are priced using available market information including benchmark yields, prepayment speeds, spreads, volatility of similar securities and trade date. ● State and political subdivisions are largely grouped by characteristics (e.g., geographical data and source of revenue in trade dissemination systems). Because some securities are not traded daily and due to other grouping limitations, active market quotes are often obtained using benchmarking for like securities. ● Auction rate asset backed securities are priced using market spreads, cash flows, prepayment speeds, and loss analytics. ● Annually every security holding is priced by a pricing service independent of the regular and recurring pricing services used. The independent service provides a measurement to indicate if the price assigned by the regular service is within or outside of a reasonable range. Management reviews this report and applies judgment in adjusting calculations at year end related to securities pricing. ● Residential mortgage loans available for sale in the secondary market are carried at fair market value. The fair value of loans held-for-sale is determined using quoted secondary market prices. ● Lending related commitments to fund certain residential mortgage loans, e.g., residential mortgage loans with locked interest rates to be sold in the secondary market and forward commitments for the future delivery of mortgage loans to third party investors as well as forward commitments for future delivery of MBS are considered derivatives. Fair values are estimated based on observable changes in mortgage interest rates including prices for MBS from the date of the commitment and do not typically involve significant judgments by management. ● The fair value of mortgage servicing rights is based on a valuation model that calculates the present value of estimated net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income to derive the resultant value. The Company is able to compare the valuation model inputs, such as the discount rate, prepayment speeds, weighted average delinquency and foreclosure/bankruptcy rates to widely available published industry data for reasonableness. ● Interest rate swap positions, both assets and liabilities, are based on valuation pricing models using an income approach reflecting readily observable market parameters such as interest rate yield curves. ● The fair value of individually evaluated loans with specific allocations of the ACL is essentially based on recent real estate appraisals or the fair value of the collateralized asset. These appraisals may utilize a single valuation approach or a combination of approaches including comparable sales and the income approach. Adjustments are made in the appraisal process by the appraisers to reflect differences between the available comparable sales and income data. Such adjustments are usually significant and typically result in a Level 3 classification of the inputs for determining fair value. ● Nonrecurring adjustments to certain commercial and residential real estate properties classified as OREO are measured at the lower of carrying amount or fair value, less costs to sell. Fair values are based on third party appraisals of the property, resulting in a Level 3 classification. In cases where the carrying amount exceeds the fair value, less costs to sell, a valuation loss is recognized. ​ Assets and Liabilities Measured at Fair Value on a Recurring Basis ​ The tables below present the balance of assets and liabilities at December 31, measured by the Company at fair value on a recurring basis are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 169,574 ​ $ - ​ $ - ​ $ 169,574 U.S. government agencies ​ ​ - ​ ​ 56,959 ​ ​ - ​ ​ 56,959 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 106,370 ​ ​ - ​ ​ 106,370 States and political subdivisions ​ ​ - ​ ​ 214,006 ​ ​ 15,329 ​ ​ 229,335 Collateralized mortgage obligations ​ ​ - ​ ​ 392,544 ​ ​ - ​ ​ 392,544 Asset-backed securities ​ ​ - ​ ​ 66,166 ​ ​ - ​ ​ 66,166 Collateralized loan obligations ​ ​ - ​ ​ 171,881 ​ ​ - ​ ​ 171,881 Loans held-for-sale ​ ​ - ​ ​ 1,322 ​ ​ - ​ ​ 1,322 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 10,344 ​ ​ 10,344 Interest rate swap agreements, including risk participation agreement ​ ​ - ​ ​ 5,391 ​ ​ - ​ ​ 5,391 Mortgage banking derivatives ​ ​ - ​ ​ (10) ​ ​ - ​ ​ (10) Total ​ $ 169,574 ​ $ 1,014,629 ​ $ 25,673 ​ $ 1,209,876 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 8,324 ​ $ - ​ $ 8,324 Total ​ $ - ​ $ 8,324 ​ $ - ​ $ 8,324 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 212,129 ​ $ - ​ $ - ​ $ 212,129 U.S. government agencies ​ ​ - ​ ​ 56,048 ​ ​ - ​ ​ 56,048 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 124,990 ​ ​ - ​ ​ 124,990 States and political subdivisions ​ ​ - ​ ​ 211,899 ​ ​ 14,229 ​ ​ 226,128 Corporate bonds ​ ​ - ​ ​ 9,622 ​ ​ - ​ ​ 9,622 Collateralized mortgage obligations ​ ​ - ​ ​ 526,998 ​ ​ 6,770 ​ ​ 533,768 Asset-backed securities ​ ​ - ​ ​ 186,916 ​ ​ 15,012 ​ ​ 201,928 Collateralized loan obligations ​ ​ - ​ ​ 174,746 ​ ​ - ​ ​ 174,746 Loans held-for-sale ​ ​ - ​ ​ 491 ​ ​ - ​ ​ 491 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 11,189 ​ ​ 11,189 Interest rate swap agreements ​ ​ - ​ ​ 6,516 ​ ​ - ​ ​ 6,516 Mortgage banking derivatives ​ ​ - ​ ​ 76 ​ ​ - ​ ​ 76 Total ​ $ 212,129 ​ $ 1,298,302 ​ $ 47,200 ​ $ 1,557,631 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 12,265 ​ $ - ​ $ 12,265 Total ​ $ - ​ $ 12,265 ​ $ - ​ $ 12,265 ​ The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2023 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ Asset-backed Mortgage Political ​ Servicing ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2023 ​ $ 15,012 $ 6,770 $ 14,229 ​ $ 11,189 Transfers out of Level 3 ​ ​ (14,885) ​ (6,764) ​ - ​ ​ - Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (11) ​ - ​ (134) ​ ​ (924) Included in other comprehensive income ​ ​ 226 ​ (6) ​ 1,010 ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 782 ​ ​ - Issuances ​ ​ - ​ - ​ - ​ ​ 580 Settlements ​ ​ (342) ​ - ​ (558) ​ ​ (501) Ending balance December 31, 2023 ​ $ - $ - $ 15,329 ​ $ 10,344 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2022 ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ ​ Asset-backed Mortgage Political ​ Servicing ​ ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2022 ​ $ - $ - $ 15,236 ​ $ 7,097 ​ Transfers into Level 3 ​ ​ 15,012 ​ 6,770 ​ - ​ ​ - ​ Transfers out of Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ - ​ - ​ (136) ​ ​ 4,106 ​ Included in other comprehensive income ​ ​ - ​ - ​ (86) ​ ​ - ​ Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 519 ​ ​ - ​ Issuances ​ ​ - ​ - ​ - ​ ​ 915 ​ Settlements ​ ​ - ​ - ​ (1,304) ​ ​ (929) ​ Ending balance December 31, 2022 ​ $ 15,012 $ 6,770 $ 14,229 ​ $ 11,189 ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ States and political subdivisions ​ $ 15,329 ​ Discounted Cash Flow ​ Discount Rate ​ 3.2 – 5.6% ​ 4.8 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.0 – 0.5% ​ 0.4 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 10,344 ​ Discounted Cash Flow ​ Discount Rate ​ 9.0 – 11.0% ​ 9.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 5.1 – 33.0% ​ 6.6 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ States and political subdivisions ​ $ 14,229 ​ Discounted Cash Flow ​ Discount Rate ​ 2.3 – 5.8% ​ 4.4 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.3 – 0.5% ​ 0.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateralized mortgage obligations ​ $ 6,770 ​ Discounted Cash Flow ​ Discount Rate ​ 7.0 – 7.0% ​ 7.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-backed securities ​ $ 15,012 ​ Discounted Cash Flow ​ Discount Rate ​ 6.2 – 6.5% ​ 6.3 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 11,189 ​ Discounted Cash Flow ​ Discount Rate ​ 9.0 – 11.0% ​ 9.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 3.6 – 27.3% ​ 6.2 % ​ Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis: ​ The Company may be required, from time to time, to measure certain other assets at fair value on a nonrecurring basis in accordance with GAAP. These assets consist of individually evaluated loans and OREO. For assets measured at fair value on a nonrecurring basis at December 31, the following tables provide the level of valuation assumptions used to determine each valuation and the carrying value of the related assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 66,180 ​ $ 66,180 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 5,123 ​ ​ 5,123 Total ​ $ - ​ $ - ​ $ 71,303 ​ $ 71,303 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans and to a lesser extent the discounted cash flow, had a carrying amount of $77.3 million and a valuation allowance of $11.1 million, resulting in a decrease of specific allocations within the provision for credit losses of $6.5 million for the year ending December 31, 2023. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $5.1 million, which is made up of the outstanding balance of $5.2 million, net of a valuation allowance of $ 118,000 at December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 47,700 ​ $ 47,700 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 1,561 ​ ​ 1,561 Total ​ $ - ​ $ - ​ $ 49,261 ​ $ 49,261 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans and to a lesser extent the discounted cash flow, had a carrying amount of $65.3 million and a valuation allowance of $17.6 million, resulting in an increase of specific allocations within the provision for credit losses of $12.2 million for the year ending December 31, 2022. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $1.6 million, which is made up of the outstanding balance of $2.5 million, net of a valuation allowance of $856,000 and purchase accounting adjustments of $131,000 at December 31, 2022. These OREO and individually evaluated loan valuations include assumptions related to cash flow projections, discount rates, and recent comparable sales. The numerical range of unobservable inputs for these valuation assumptions are not meaningful.

Fair Values of Financial Instru

Fair Values of Financial Instruments	12 Months Ended
	Dec. 31, 2023
Fair Values of Financial Instruments
Fair Values of Financial Instruments	Note 18: Fair Value of Financial Instruments ​ The estimated fair values approximate carrying amount for all items except those described in the following table. Securities available-for-sale fair values are based upon market prices or dealer quotes, and if no such information is available, on the rate and term of the security. The carrying value of FHLBC stock approximates fair value as the stock is nonmarketable and can only be sold to the FHLBC or another member institution at par. FHLBC stock is carried at cost and considered a Level 2 fair value. For December 31, 2023 and 2022, the fair values of loans and leases are estimated on an exit price basis incorporating discounts for credit, liquidity and marketability factors. The fair value of time deposits is estimated using discounted future cash flows at current rates offered for deposits of similar remaining maturities. The fair values of borrowings were estimated based on interest rates available to the Company for debt with similar terms and remaining maturities. The fair value of off balance sheet volume is not considered material. The fair value of mortgage banking derivatives is discussed in Note 16: Mortgage Banking Derivatives, above. ​ The carrying amount and estimated fair values of financial instruments at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 55,534 ​ $ 55,534 ​ $ 55,534 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 44,611 ​ ​ 44,611 ​ ​ 44,611 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,192,829 ​ ​ 1,192,829 ​ ​ 169,574 ​ ​ 1,007,926 ​ ​ 15,329 FHLBC and FRBC stock ​ ​ 33,355 ​ ​ 33,355 ​ ​ - ​ ​ 33,355 ​ ​ - Loans held-for-sale ​ ​ 1,322 ​ ​ 1,322 ​ ​ - ​ ​ 1,322 ​ ​ - Net loans ​ ​ 3,998,689 ​ ​ 3,876,381 ​ ​ - ​ ​ - ​ ​ 3,876,381 Mortgage servicing rights ​ ​ 10,344 ​ ​ 10,344 ​ ​ - ​ ​ - ​ ​ 10,344 Interest rate swap agreements ​ ​ 5,302 ​ ​ 5,302 ​ ​ - ​ ​ 5,302 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ (10) ​ ​ (10) ​ ​ - ​ ​ (10) ​ ​ - Interest receivable on securities and loans ​ ​ 27,159 ​ ​ 27,159 ​ ​ - ​ ​ 27,159 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 1,834,891 ​ $ 1,834,891 ​ $ 1,834,891 ​ $ - ​ $ - Interest bearing deposits ​ ​ 2,735,855 ​ ​ 2,726,223 ​ ​ - ​ ​ 2,726,223 ​ ​ - Securities sold under repurchase agreements ​ ​ 26,470 ​ ​ 26,470 ​ ​ - ​ ​ 26,470 ​ ​ - Other short-term borrowings ​ ​ 405,000 ​ ​ 405,000 ​ ​ - ​ ​ 405,000 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 20,361 ​ ​ - ​ ​ 20,361 ​ ​ - Subordinated debentures ​ ​ 59,382 ​ ​ 47,982 ​ ​ - ​ ​ 47,982 ​ ​ - Interest rate swap agreements ​ ​ 8,324 ​ ​ 8,324 ​ ​ - ​ ​ 8,324 ​ ​ - Interest payable on deposits and borrowings ​ ​ 2,962 ​ ​ 2,962 ​ ​ - ​ ​ 2,962 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 56,632 ​ $ 56,632 ​ $ 56,632 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 58,545 ​ ​ 58,545 ​ ​ 58,545 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,539,359 ​ ​ 1,539,359 ​ ​ 212,129 ​ ​ 1,291,219 ​ ​ 36,011 FHLBC and FRBC stock ​ ​ 20,530 ​ ​ 20,530 ​ ​ - ​ ​ 20,530 ​ ​ - Loans held-for-sale ​ ​ 491 ​ ​ 491 ​ ​ - ​ ​ 491 ​ ​ - Net loans ​ ​ 3,820,129 ​ ​ 3,681,387 ​ ​ - ​ ​ - ​ ​ 3,681,387 Mortgage servicing rights ​ ​ 11,189 ​ ​ 11,189 ​ ​ - ​ ​ - ​ ​ 11,189 Interest rate swap agreements ​ ​ 6,391 ​ ​ 6,391 ​ ​ - ​ ​ 6,391 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 76 ​ ​ 76 ​ ​ - ​ ​ 76 ​ ​ - Interest receivable on securities and loans ​ ​ 22,661 ​ ​ 22,661 ​ ​ - ​ ​ 22,661 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 2,051,702 ​ $ 2,051,702 ​ $ 2,051,702 ​ $ - ​ $ - Interest bearing deposits ​ ​ 3,059,021 ​ ​ 3,042,740 ​ ​ - ​ ​ 3,042,740 ​ ​ - Securities sold under repurchase agreements ​ ​ 32,156 ​ ​ 32,156 ​ ​ - ​ ​ 32,156 ​ ​ - Other short-term borrowings ​ ​ 90,000 ​ ​ 90,000 ​ ​ - ​ ​ 90,000 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 21,907 ​ ​ - ​ ​ 21,907 ​ ​ - Subordinated debentures ​ ​ 59,297 ​ ​ 52,322 ​ ​ - ​ ​ 52,322 ​ ​ - Senior notes ​ ​ 44,585 ​ ​ 44,248 ​ ​ 44,248 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 9,000 ​ ​ 8,984 ​ ​ - ​ ​ 8,984 ​ ​ - Interest rate swap agreements ​ ​ 12,264 ​ ​ 12,264 ​ ​ - ​ ​ 12,264 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,657 ​ ​ 1,657 ​ ​ - ​ ​ 1,657 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions	12 Months Ended
	Dec. 31, 2023
Derivative Excluding Mortgage Banking Derivatives
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions	Note 19: Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions ​ Risk Management Objective of Using Derivatives ​ The Company is exposed to certain risk arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, liquidity, and credit risk primarily by managing the amount, sources, and duration of its assets and liabilities and the use of derivative financial instruments. Specifically, the Company enters into derivative financial instruments to manage exposures that arise from business activities that result in the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. The Company’s derivative financial instruments are used to manage differences in the amount, timing, and duration of the Company’s known or expected cash receipts and its known or expected cash payments principally related to the Company’s loan portfolio. ​ Cash Flow Hedges of Interest Rate Risk ​ The Company’s objectives in using interest rate derivatives are to add stability to interest income and expense and to manage its exposure to interest rate movements. To accomplish this objective, the Company primarily uses interest rate swaps as part of its interest rate risk management strategy. The aggregate fair value of the swaps are recorded in other assets or other liabilities with changes in fair value recorded in other comprehensive income, net of tax. The amount included in other comprehensive income would be reclassified to current earnings should all or a portion of the hedge no longer be considered effective. For derivatives designated and that qualify as cash flow hedges of interest rate risk, the gain or loss on the derivative is recorded in accumulated other comprehensive income and subsequently reclassified into interest income or interest expense in the same period(s) during which the hedged transaction affects earnings. Amounts reported in accumulated other comprehensive income related to derivatives will be reclassified to interest income or expense as interest payments are received on the variable rate loan pools or paid on the Company’s fixed-rate borrowings. ​ Interest rate swaps with notional amounts totaling $300.0 million and $250.0 million as of December 31, 2023 and 2022, respectively, were designated as cash flow hedges of certain variable rate commercial and commercial real estate loan pools. Each of these hedges were executed to pay variable and receive fixed rate cash flows. Each of these hedges was determined to be effective during all periods presented and the Company expects the hedges to remain effective during the remaining terms of the swaps. ​ An interest rate swap with a notional amount of $25.8 million as of December 31, 2023 and 2022, is designated as a cash flow hedge of junior subordinated debentures and was executed to pay fixed and receive variable rate cash flows. The hedge was determined to be effective during all periods presented and the Company expects the hedge to remain effective during the remaining terms of the swap. ​ During the next twelve months, the Company estimates that an additional $5.1 million will be reclassified as an increase to interest income and an additional $546,000 will be reclassified as an increase to interest expense. ​ Non-designated Hedges ​ Derivatives not designated as hedges are not speculative and result from a service the Company provides to certain customers. The Company executes interest rate swaps with commercial banking customers to facilitate their respective risk management strategies. The notional amounts of interest rate swaps with its loan customers as of December 31, 2023 and 2022 were $104.8 million and $110.6 million, respectively. Those interest rate swaps are simultaneously hedged by offsetting derivatives that the Company executes with a third party, such that the Company minimizes its net risk exposure resulting from such transactions. As the interest rate derivatives associated with this program do not meet the strict hedge accounting requirements, changes in the fair value of both the customer derivatives and the offsetting derivatives are recognized directly in earnings. ​ At December 31, 2023 and 2022, the Company had $7.3 million and $11.2 million of cash collateral pledged with two correspondent financial institutions, respectively. The Company held $4.1 million and $5.3 million of cash pledged from one correspondent financial institution to support the interest rate swap activity during the years presented, respectively. No investment securities were required to be pledged to any correspondent financial institution during 2023 or 2022. The Company offsets derivative assets and liabilities that are subject to a master netting arrangement. ​ The Company also grants mortgage loan interest rate lock commitments to borrowers, subject to normal loan underwriting standards. The interest rate risk associated with these loan interest rate lock commitments is managed with contracts for future deliveries of loans as well as selling forward mortgage-backed securities contracts. Loan interest rate lock commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The notional amount of these commitments at December 31, 2023 and 2022 were $8.4 million and $5.3 million. Commitments to originate residential mortgage loans held-for-sale and forward commitments to sell residential mortgage loans or forward MBS contracts are considered derivative instruments and changes in the fair value are recorded to mortgage banking revenue. Fair values are estimated based on observable changes in mortgage interest rates including mortgage-backed securities prices from the date of the commitment. ​ ​ ​ ​ ​ The table below presents the fair value of the Company’s derivative financial instruments as well as their classification on the Balance Sheets as of December 31, were as follows: ​ Fair Value of Derivative Instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 5 ​ 325,774 ​ Other Assets 2,576 ​ Other Liabilities 5,598 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,576 ​ ​ 5,598 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 17 ​ 104,777 ​ Other Assets 2,726 ​ Other Liabilities 2,726 Interest rate lock commitments and forward contracts 24 ​ 8,375 ​ Other Assets (10) ​ Other Liabilities - Other contracts 4 ​ 44,790 ​ Other Assets 89 ​ Other Liabilities - Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 2,805 ​ ​ 2,726 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 4 ​ 275,774 ​ Other Assets 2,737 ​ Other Liabilities 8,610 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,737 ​ ​ 8,610 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 21 ​ 110,647 ​ Other Assets 3,654 ​ Other Liabilities 3,654 Interest rate lock commitments and forward contracts 28 ​ 5,298 ​ Other Assets 76 ​ Other Liabilities - Other contracts 4 ​ 43,699 ​ Other Assets 125 ​ Other Liabilities 1 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,855 ​ ​ 3,655 ​ Disclosure of the Effect of Fair Value and Cash Flow Hedge Accounting ​ The fair value and cash flow hedge accounting related to derivatives covered under ASC Subtopic 815-20 impacted Accumulated Other Comprehensive Income (“AOCI”) and the Income Statement. The loss recognized in AOCI on derivatives totaled $2.2 million, $4.2 million, and $2.4 million as of December 31, 2023, 2022, and 2021, respectively. The amount of the loss reclassified from AOCI to interest expense on the income statement totaled $5.6 million and $373,000 for the years ended December 31, 2023 and December 31, 2022, respectively, and a gain reclassified from AOCI to interest income was $56,000 for the year ended December 31, 2021. ​ Credit-risk-related Contingent Features ​ For derivative transactions involving counterparties who are lending customers of the Company, the derivative credit exposure is managed through the normal credit review and monitoring process, which may include collateralization, financial covenants and/or financial guarantees of affiliated parties. Agreements with such customers require that losses associated with derivative transactions receive payment priority from any funds recovered should a customer default and ultimate disposition of collateral or guarantees occur. ​ Credit exposure to broker/dealer counterparties is managed through agreements with each derivative counterparty that require collateralization of fair value gains owed by such counterparties. Some small degree of credit exposure exists due to timing differences between when a gain may occur and the subsequent point in time that collateral is delivered to secure that gain. This is monitored by the Company and procedures are in place to minimize this exposure. Such agreements also require the Company to collateralize counterparties in circumstances wherein the fair value of the derivatives result in loss to the Company. ​ Other provisions of such agreements define certain events that may lead to the declaration of default and/or the early termination of the derivative transaction(s), including the following: ● if the Company either defaults or is capable of being declared in default on any of its indebtedness (exclusive of deposit obligations); ● if a merger occurs that materially changes the Company's creditworthiness in an adverse manner; or ● if certain specified adverse regulatory actions occur, such as the issuance of a Cease and Desist Order, or citations for actions considered Unsafe and Unsound or that may lead to the termination of deposit insurance coverage by the Federal Deposit Insurance Corporation.

Preferred Stock

Preferred Stock	12 Months Ended
	Dec. 31, 2023
Preferred Stock.
Preferred Stock	Note 20: Preferred Stock ​ Preferred stock of 300,000 shares is authorized but unissued as of December 31, 2023 and 2022. ​

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
	Dec. 31, 2023
Parent Company Condensed Financial Information
Parent Company Condensed Financial Information	Note 21: Parent Company Condensed Financial Information ​ Condensed Balance Sheets for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 36,686 ​ $ 39,167 ​ Investment in subsidiaries ​ 620,663 ​ 555,140 ​ Other assets ​ 6,183 ​ 6,526 ​ Total assets ​ $ 663,532 ​ $ 600,833 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,382 ​ 59,297 ​ Senior notes ​ ​ - ​ ​ 44,585 ​ Notes payable ​ ​ - ​ ​ 9,000 ​ Other liabilities ​ 1,096 ​ 1,037 ​ Stockholders’ equity ​ 577,281 ​ 461,141 ​ Total liabilities and stockholders' equity ​ $ 663,532 ​ $ 600,833 ​ ​ Condensed Statements of Income for the years ended December 31 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 65,000 ​ $ 40,000 ​ $ 40,000 Other income ​ 67 ​ 29 ​ 15 Total operating income ​ 65,067 ​ 40,029 ​ 40,015 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,095 ​ 1,136 ​ 1,133 Subordinated debt ​ ​ 2,185 ​ ​ 2,185 ​ ​ 1,610 Senior notes ​ ​ 2,408 ​ ​ 2,682 ​ ​ 2,692 Notes payable ​ 87 ​ 385 ​ 291 Other expenses ​ 5,947 ​ 5,086 ​ 6,918 Total operating expense ​ 11,722 ​ 11,474 ​ 12,644 Income before income taxes and equity in undistributed net income of subsidiaries ​ 53,345 ​ 28,555 ​ 27,371 Income tax benefit ​ (3,309) ​ (3,216) ​ (2,986) Income before equity in undistributed net income of subsidiaries ​ 56,654 ​ 31,771 ​ 30,357 Equity in undistributed net income of subsidiaries ​ 35,075 ​ 35,634 ​ (10,313) Net income available to common stockholders ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 ​ ​ Condensed Statements of Cash Flows for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ (35,075) ​ (35,634) ​ 10,313 Provision for deferred tax (benefit) expense ​ (513) ​ 91 ​ (248) Change in taxes payable ​ 794 ​ (4,694) ​ (695) Change in other assets ​ (43) ​ 12 ​ (12) Stock-based compensation ​ 3,603 ​ 2,960 ​ 1,435 Other, net ​ 575 ​ (2,753) ​ 961 Net cash provided by operating activities ​ 61,070 ​ 27,387 ​ 31,798 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Investing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for acquisition, net of cash and cash equivalents retained ​ - ​ - ​ (94,406) Net cash used in investing activities ​ - ​ - ​ (94,406) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Financing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividend paid on common stock ​ ​ (8,946) ​ ​ (8,877) ​ ​ (4,612) Purchases of treasury stock ​ (605) ​ (455) ​ (10,417) Issuance of sub debt ​ ​ - ​ ​ - ​ ​ 59,148 Repayment of term note ​ ​ (9,000) ​ ​ (4,000) ​ ​ (4,000) Repayment of senior note ​ ​ (45,000) ​ ​ - ​ ​ - Net cash (used in) provided by financing activities ​ (63,551) ​ (13,332) ​ 40,119 Net change in cash and cash equivalents ​ (2,481) ​ 14,055 ​ (22,489) Cash and cash equivalents at beginning of year ​ 39,167 ​ 25,112 ​ 47,601 Cash and cash equivalents at end of year ​ $ 36,686 ​ $ 39,167 ​ $ 25,112 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2023
Employee Benefit Plans
Employee Benefit Plans	Note 22: Employee Benefit Plans ​ Old Second Bancorp, Inc. Employees 401(k) Savings Plan and Trust The Company sponsors a qualified, tax-exempt defined contribution plan (the “401(k) Plan”) qualifying under section 401(k) of the Internal Revenue Code. Virtually all employees are eligible to participate after meeting certain age and service requirements. Eligible employees are permitted to contribute up to a dollar limit set by law of their compensation to the 401(k) Plan. For the years ended December 31, 2023, 2022 and 2021, a discretionary match equal to 100% of the first 3% and 50% of the next 2% was made to participants of the 401(k) Plan. Participants are 100% vested in the discretionary matching contributions. Participants can choose between several different investment options under the 401(k) Plan, including shares of the Company’s common stock. An additional component of the 401(k) Plan arrangement allows the Company to make annual discretionary profit sharing contributions based on the Company’s profitability in a given year, and on each participant’s annual compensation. The Company elected not to make a discretionary profit sharing contribution for the years end December 31, 2023, 2022 and 2021. ​ The total expense relating to the 401(k) Plan was approximately $2.2 million in 2023, $2.0 million in 2022 and $1.4 million in 2021. ​ Old Second Bancorp, Inc. Voluntary Deferred Compensation Plan for Executives and Directors ​ The Company sponsors a deferred compensation plan, which is a means by which certain executives and directors may voluntarily defer a portion of their salary, bonus and directors fees, as applicable. This plan is an unfunded, nonqualified deferred compensation arrangement. Company obligations under this arrangement as of December 31, 2023 and 2022 are included in other liabilities.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2023
Summary of Significant Accounting Policies
Nature of Operations	Nature of Operations ​ The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Station I, LLC, which holds property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2023 presentation.
Use of Estimates	Use of Estimates
Principles of Consolidation	Principles of Consolidation –
Segment Reporting	Segment Reporting
Concentration of Credit Risk	Concentration of Credit Risk
Cash and Cash Equivalents	Cash and Cash Equivalents
Securities	Securities ​ Realized securities gains or losses, which are reported in securities (losses) gains, net, in the Consolidated Statements of Income, are recognized on a trade date basis and are determined using the specific identification method. Discounts are accreted into interest income over the estimated life of the related security and premiums are amortized into income to the earlier of the call date or estimated life of the related security using the level yield method. ​ The Company has made a policy election to exclude accrued interest income from the amortized cost basis of available-for-sale debt securities and report accrued interest separately in other assets in the Consolidated Balance Sheets. A debt security is placed on nonaccrual status at the time we no longer expect to receive all contractual amounts due, which is generally at 90 days past due. Accrued interest for a security placed on nonaccrual is reversed against interest income. Accordingly, we do not recognize an allowance for credit loss against accrued interest receivable. ​ For available-for-sale debt securities in an unrealized loss position, we first assess whether we intend to sell, or it is more likely than not that we will be required to sell the security, prior to the recovery of its amortized cost basis. If either of the above criteria is met, the security’s amortized cost basis is written down to fair value through earnings. When the criteria above is not met, we evaluate whether the decline in fair value is the result of credit losses or other factors. In making this assessment, we review changes to the rating of the security by a rating agency, an increase in defaults on the underlying collateral, and the extent to which the securities are issued by the federal government or its agencies, including the amount of the guarantee issued by those agencies, among other factors. If this assessment indicates that a credit loss exists, we compare the present value of cash flows expected to be collected from the security with the amortized cost basis of the security. If the present value of cash flows expected to be collected is less than the amortized cost basis for the security, a credit loss exists and an allowance for credit losses is recorded through earnings, limited to the amount that the fair value of the security is less than its amortized cost basis. Any impairment that has not been recorded through an allowance for credit losses is recognized in other comprehensive (loss) income, net of taxes. ​ Changes in the allowance for credit losses are recorded as a provision for (or reversal of) credit loss expense. Losses are charged against the allowance when management believes the uncollectibility of an available for sale debt security is confirmed or when either of the criteria regarding intent or requirement to sell is met.
Federal Home Loan Bank and Federal Reserve Bank Stock	Federal Home Loan Bank and Federal Reserve Bank Stock
Loans Held-for-Sale	Loans Held-for-Sale ​ Mortgage loans held for sale are generally sold with servicing rights retained. The carrying value of mortgage loans is reduced by the amount allocated to the servicing right. Gains and losses on sales of mortgage loans are based on the difference between the selling price and the carrying value of the related sold loan.
Loans	Loans ​ Interest income on loans is accrued based on principal amounts outstanding. Loan and lease origination fees, commitment fees, and certain direct loan origination costs are deferred and amortized over the life of the related loans or commitments as a yield adjustment. Fees related to standby letters of credit, whose ultimate exercise is remote, are amortized into fee income over the estimated life of the commitment. Other related fees are recognized as fee income when earned. ​ Past Due and Nonaccrual Loans ​ Loans are considered past due or delinquent when the contractual principal or interest due in accordance with the terms of the loan agreement or any portion thereof remains unpaid after the due date of the scheduled payment. Generally, loans are placed on nonaccrual status (i) when either principal or interest payments become 90 days or more past due based on contractual terms unless the loan is sufficiently collateralized such that full repayment of both principal and interest is expected and is in the process of collection within a reasonable period or (ii) when an individual analysis of a borrower’s creditworthiness indicates a credit should be placed on nonaccrual status whether or not the loan is 90 days or more past due. When a loan is placed on nonaccrual status, unpaid interest credited to income is reversed. Interest received on such loans is accounted for on the cash-basis or cost recovery method, until qualifying for return to accrual. Under the cost-recovery method, interest income is not recognized until the loan balance is reduced to zero. Under the cash basis method, interest income is recorded when the payment is received in cash. Nonaccrual loans are returned to accrual status when the financial position of the borrower and other relevant factors indicate there is no longer doubt that the Company will collect all principal and interest due. ​ Purchase Credit Deteriorated (PCD) Loans ​ Purchased credit deteriorated loans (“PCD loans”) are purchased loans, that, as of the date of acquisition, have experienced a more-than-insignificant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment. The initial allowance for credit losses determined on an individual loan basis from an evaluation of each specific loan and its related credit metrics. The sum of the loan’s purchase price and initial allowance for credit losses becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a noncredit discount or premium, which is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income. ​ Non-Purchase Credit Deteriorated (Non-PCD) Loans ​ Non-purchased credit deteriorated loans (“non-PCD loans”) are purchased loans, that, as of the date of acquisition, have not experienced a significant deterioration in credit quality since origination, as determined by the Company’s assessment. An allowance for credit losses is determined using the same methodology as other loans held for investment, and no allowance is established as a Day One fair valuation allowance. The sum of the loan’s purchase price becomes its initial amortized cost basis. The difference between the initial amortized cost basis and the par value of the loan is a discount or premium, which is comprised of an interest component and a credit component, and is accreted or amortized into interest income over the life of the loan. Expected cash flows in excess of the amount paid are recorded as interest income over the remaining life of the loans (accretable yield). The excess of the loan’s contractual principal and interest over expected cash flows is not recorded (nonaccretable difference). ​ A subsequent Day Two adjustment on non-PCD loans is recorded to the allowance for credit losses immediately after acquisition, which reflects the future estimated lifetime credit losses on the non-PCD loans, recorded through the provision for credit losses. Over the life of the loan, expected cash flows continue to be estimated. If the present value of expected cash flows is less than the carrying amount, a loss is recorded as a provision for credit losses. If the present value of expected cash flows is greater than the carrying value, it is recognized as part of future interest income.
Allowance for Credit Losses ("ACL")	Allowance for Credit Losses (“ACL”) ​ ACL on Loans ​ The ACL on loans is a valuation account that is deducted from the amortized cost basis of loans to present the net amount expected to be collected on loans. The Company’s estimate of the ACL for loans reflects losses expected over the remaining contractual life of the loans. The contractual term does not consider extensions, renewals or modifications. ​ Determination of the ACL on loans is inherently subjective in nature since it requires significant estimates and management judgment, and includes a level of imprecision given the difficulty of identifying and assessing the factors impacting loan repayment and estimating the timing and amount of losses. While management utilizes its best judgment and information available, the ultimate adequacy of the ACL is dependent upon a variety of factors beyond the Company’s direct control, including, but not limited to, the performance of the loan portfolio, consideration of current economic trends, changes in interest rates and property values, estimated losses on pools of homogeneous loans based on an analysis that uses historical loss experience for prior periods that are determined to have like characteristics with the current period such as pre-recessionary, recessionary, or recovery periods, portfolio growth and concentration risk, management and staffing changes, the interpretation of loan risk classifications by regulatory authorities and other credit market factors. While each component of the ACL on loans is determined separately, the entire balance is available for the entire loan portfolio. ​ The ACL methodology consists of measuring loans on a collective (pool) basis when similar risk characteristics exist. The type of credit composition and risk characteristics of each portfolio segment are as follows:
Lease financing receivables	Lease financing receivables –
Premises and Equipment	Premises and Equipment ​ Whenever events or changes in circumstances dictate, the Company tests its long-lived assets for impairment by determining whether the sum of the estimated undiscounted future cash flows attributable to a long-lived asset or asset group is less than the carrying value of the long-lived asset or asset group through a probability-weighted approach. In the event the carrying amount of the long-lived asset or asset group is not recoverable, an impairment loss is measured as the amount by which the carrying amount of the long-lived asset or asset group exceeds its fair value.
Other Real Estate Owned ("OREO")	Other Real Estate Owned (“OREO”)
Mortgage Servicing Rights	Mortgage Servicing Rights ​ Mortgage loans that the Company is servicing for others aggregated to $737.2 million and $771.4 million at December 31, 2023, and 2022, respectively. Mortgage loans that the Company is servicing for others are not included in the consolidated balance sheets. Fees received in connection with servicing loans for others are recognized as earned. Loan servicing costs are charged to expense as incurred. ​ Servicing rights are recognized separately as assets when they are acquired through sales of loans and servicing rights are retained. Servicing rights are initially recorded at fair value with the effect recorded in net gains on sales of mortgage loans in the Consolidated Statements of Income. Fair value is based on market prices for comparable mortgage servicing contracts, when available, or alternatively, is based on a valuation model that calculates the present value of estimated future net servicing income. The valuation model incorporates assumptions that market participants would use in estimating future net servicing income, such as the cost to service, the discount rate, the custodial earnings rate, an inflation rate, ancillary income, prepayment speeds and default rates and losses. ​ Servicing fee income, which is included in the Consolidated Statements of Income as mortgage servicing income, is recorded for fees earned for servicing loans. The fees are based on a contractual percentage of the outstanding principal or a fixed amount per loan and are recorded as income when earned. ​ Under the fair value measurement method, the Company measures mortgage servicing rights at fair value at each reporting date, reports changes in fair value of servicing assets in earnings in the period in which the changes occur, and includes these changes in mortgage servicing rights mark to market in the Consolidated Statements of Income. The fair values of mortgage servicing rights are subject to significant fluctuations as a result of interest rates, changes in estimated and actual prepayment speeds and default rates and losses. ​ Transfers of Financial Assets – ​ Transfers of a portion of a loan must meet the criteria of a participating interest. If it does not meet the criteria of a participating interest, the transfer must be accounted for as a secured borrowing. In order to meet the criteria for a participating interest, all cash flows from the loan must be divided proportionately, the rights of each loan holder must have the same priority, and the loan holders must have no recourse to the transferor other than standard representations and warranties and no loan holder has the right to pledge or exchange the entire loan. ​ The Company sells financial assets in the normal course of business, the majority of which are related to residential mortgage loan sales through established programs, and commercial loan sales through participation agreements. In accordance with accounting guidance for asset transfers, the Company considers any ongoing involvement with transferred assets in determining whether the assets can be derecognized from the balance sheet. With the exception of servicing and certain performance-based guarantees, the Company’s continuing involvement with financial assets sold is minimal and generally limited to market customary representation and warranty clauses. ​ When the Company sells financial assets, it may retain servicing rights and/or other interests in the financial assets. The gain or loss on sale depends on the previous carrying amount of the transferred financial assets, the servicing right recognized, the consideration received, and any liabilities incurred in exchange for the transferred assets. Upon transfer, any servicing assets and other interests held by the Company are carried at the lower of cost or fair value, with the exception of mortgage servicing rights related to sales of residential mortgage loans, which are carried at fair value.
Bank-Owned Life Insurance ("BOLI")	Bank-Owned Life Insurance (“BOLI”)
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible ​ The Company performed a qualitative assessment of goodwill as of November 30, 2023 which resulted in the fair value of the Company exceeding the carrying value; therefore, it was determined goodwill was not impaired at December 31, 2023. On November 30, 2022, the Company performed a quantitative assessment of goodwill from which we concluded it was more likely than not that goodwill was not impaired as of December 31, 2022. The quantitative assessment was performed as a matter of periodic practice rather than as a response to a qualitative assessment or triggering event. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2023, CDI totaled $11.2 million compared to $13.7 million at December 31, 2022. The total CDI amount reflects the acquisition of West Suburban in 2021 as well as ABC Bank in 2018 and the Talmer Bank branch purchase in 2016. Total CDI amortization expense of $2.5 million, $2.6 million, and $644,000 was recorded in 2023, 2022, and 2021, respectively. The expected future annual amortization expense for each of the next five years (2024-2028) is approximately $2.3 million, $2.1 million, $1.8 million, $1.6 million, and $1.3 million, respectively.
Debt Issuance Costs	Debt Issuance Costs –
Loss Contingencies	Loss Contingencies –
Noninterest Income	Noninterest Income ​ Wealth management ​ Service charges on deposits ​ Card related income
Advertising Costs	Advertising Costs
Equity Incentive Plan	Equity Incentive Plan
Income Taxes	Income Taxes ​ Deferred tax assets and liabilities are recognized for the future tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and liabilities are measured using the enacted tax rates that are expected to apply to taxable income in years in which those temporary differences are expected to be recovered or settled. ​ As of December 31, 2023 and 2022 the Company evaluated tax positions taken for filings with the Internal Revenue Service and all state jurisdictions in which it operates. The Company believes that income tax filing positions will be sustained under examination and does not anticipate any adjustments that would result in a material adverse effect on the Company’s financial condition, results of operations, or cash flows. Accordingly, the Company has not recorded any reserves or related accruals for interest and penalties for uncertain tax positions at December 31, 2023 and 2022. The Company is currently open to audit under the statute of limitations for Federal taxes from 2020 to 2022 and various state jurisdictions from 2018 to 2022.
Earnings Per Common Share ("EPS")	Earnings Per Common Share (“EPS”)
Treasury Stock	Treasury Stock
Derivative Financial Instruments	Derivative Financial Instruments ​ If it is determined that the derivative instrument is not highly effective as a hedge, hedge accounting is discontinued, and the adjustment to fair value of the derivative instrument is recorded in earnings. For a derivative used to hedge changes in cash flows associated with forecasted transactions, the gain or loss on the effective portion of the derivative is deferred and reported as a component of accumulated other comprehensive income, which is a component of stockholders’ equity, until such time the hedged transaction affects earnings. For derivative instruments not accounted for as hedges, changes in fair value are recognized in noninterest income/expense. Counterparty risk with loan customers is managed through loan covenant agreements and, as such, does not have a significant impact on the fair value of the swaps. Counterparty risk with other banks is managed through bilateral collateralization agreements. Deferred gains and losses from derivatives not accounted for as hedges and that are terminated are amortized over the shorter of the original remaining term of the derivative or the remaining life of the underlying asset or liability.
Comprehensive Income	Comprehensive Income
Recent Accounting Pronouncements	Recent Accounting Pronouncements : ​ ASU 2018-16, ASU 2020-04, ASU 2021-01, and ASU 2022-06 Derivatives and Hedging (Topic 815): Inclusion of the Secured Overnight Financing Rate (SOFR) Overnight Index Swap (OIS) Rate as a Benchmark Interest Rate for Hedge Accounting. Reference Rate Reform ​ The Company formed a LIBOR transition team in 2019 and developed a project plan to assess the use of alternative indexes and to seek to ensure all financial instruments that reference LIBOR were identified, quantified, and researched for the LIBOR fallback language available or needed. The Company completed the ISDA protocol adherence for LIBOR fallback language for all commercial swaps, met with its commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by the Bank for new loans to ensure appropriate fallback language was included. The Bank discontinued the use of LIBOR as a reference rate for all consumer loans issued after July 31, 2021, and all commercial loans issued after December 31, 2021, with certain exceptions for those loans that were in the process of funding at the end of 2021. The Company’s systems were updated to handle multiple SOFR-based indexes and the Company planned accordingly for the transition of existing LIBOR exposures as the final LIBOR cessation date was June 30, 2023. As of September 30, 2023, the Company’s LIBOR transition processes were determined to be completed and alternative index rates are in place. ASU 2022-01 ​ ASU 2022-02 ​ ASU 2023-06 Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative”. The amendments in this Update modify the disclosure or presentation requirements of a variety of Topics in the Codification. Certain of the amendments represent clarifications to, or technical corrections of, the current requirements. Each amendment in the ASU will only become effective if the SEC removes the related disclosure or presentation requirement from its existing regulations by June 30, 2027. The amendments in this ASU are not expected to have a material impact on the financial statements of the Company. ​ ASU 2023-09 Income Taxes (Topic 740): Improvements to Income Tax Disclosures”. (2) The amount of income taxes paid (net of refunds received) disaggregated by individual jurisdictions in which income taxes paid (net of refunds received) is equal to or greater than 5 percent of total income taxes paid (net of refunds received). The amendments also require that all entities disclose the following information: (1) Income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign, (2) Income tax expense (or benefit) from continuing operations disaggregated by federal (national), state, and foreign. The ASU is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments should be applied on a prospective basis. Retrospective application is permitted. The Company will adopt for the reporting period beginning January 1, 2025, and does not expect the amendments to have a material impact to the financial statements of the Company.
Subsequent Events	Subsequent Events ​ On January 16, 2024, the Company’s Board of Directors declared a cash dividend of $0.05 per share payable on February 5, 2024, to stockholders of record as of January 26, 2024.
Mortgage Banking Derivatives.
Summary of Significant Accounting Policies
Derivative Financial Instruments	Mortgage Banking Derivatives .
Commercial
Summary of Significant Accounting Policies
Loans	Commercial loans
Real estate - commercial loans
Summary of Significant Accounting Policies
Loans	Real estate - commercial loans - ● CRE owner occupied – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. ● CRE investor – the Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver. The primary difference between this segment and CRE owner occupied is within the slightly elevated historical loss rates and qualitative factors used, as the CRE investor properties are more susceptible to market conditions affecting commercial real estate performance compared to owner occupied.
Real estate - residential loans
Summary of Significant Accounting Policies
Loans	Real estate - residential loans ● Residential owner-occupied – these loans are secured by 1-4 family residential dwellings that are primary or secondary residences and the Company holds a first lien position. The Company applies historical loss rates from periods with like characteristics as the current period, with a longer remaining life than other segments, due to the usually longer-term nature of these loans. ● Residential investor – these loans are secured by 1-4 family residential dwellings that are not a primary or secondary residence and the Company holds a first lien position. The Company applies historical loss rates from periods with like characteristics as the current period, with a slightly longer remaining life than other segments, but shorter duration than residential owner-occupied. ● Multifamily – these loans are secured by 5+ unit residential dwellings and the Company typically holds a first lien position. The Company classifies five different risk levels within this segment to assign a loss rate based on historical losses, as well as utilizing a forecasted average unemployment rate for the next twelve months as a loss driver.
Consumer
Summary of Significant Accounting Policies
Loans	Home equity lines of credit (“HELOCs”) ​ Consumer loans ​ The methodologies used for calculating the ACL on each loan segment include (i) a migration analysis for commercial, CRE owner occupied, CRE investor, and multifamily segments; (ii) a static pool analysis for construction, residential investor, residential owner occupied and the HELOC segments; and (iii) a WARM (weighted average remaining maturity) methodology is used for lease financing receivables and consumer segments. The forecast period used for each segment calculation was one year, with an immediate reversion to historical loss rates following this one year period. In addition, the Company applies qualitative adjustments to each different loan or lease segment, as described below. ​ The qualitative factors applied to each ● changes in lending policies and procedures, including changes in underwriting standards and collections, charge-offs and recovery practices; ● changes in international, national, regional, and local conditions (specific factors which impact portfolios or discrepancies with national economic factors which are utilized within the economic forecast); ● changes in the experience, depth and ability of lending management; ● changes in the volume and severity of past due loans and other similar loan conditions; ● changes in the nature and volume of the loan portfolio and terms of loans; ● the existence and effect of any concentrations of credit and changes in the levels of such concentrations (this characteristic requires any portfolio exceeding 25% of capital to have a factor considered unless the pool is otherwise well diversified or holds a relatively low inherent risk); ● effects of other external factors, such as competition, legal or regulatory factors, on the level of estimated credit losses; ● changes in the quality of our loan review functions; and ● changes in the value of underlying collateral for collateral dependent loans. ​ The impact of the above listed internal and external qualitative and credit market risk factors is assessed within predetermined ranges to adjust the ACL totals calculated. Changes in the above factors are assessed no less than quarterly, and directly impact the total estimated credit losses recorded. ​ Loans that do not share risk characteristics are evaluated on an individual basis. Such loans evaluated individually are not also included in the collective evaluation. The amount of expected credit loss is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral less applicable selling costs. When management determines that foreclosure is probable, the amount of credit loss is determined using the fair value of collateral, less costs to sell. ​ Loans are charged off against the ACL when management believes the uncollectibility of a loan balance is confirmed, while recoveries of amounts previously charged-off are credited to the ACL. Expected recoveries do not exceed the aggregate of amounts previously charged-off and expected to be charged off. Approved releases from previously established ACL reserves authorized under our ACL methodology also reduce the ACL. Additions to the ACL are established through the provision for credit losses on loans, which is charged to expense. The Company’s ACL methodology is intended to reflect all loan portfolio risk, but management recognizes the inability to accurately depict all future credit losses in a current ACL estimate, as the impact of various factors cannot be fully known. Accrued interest receivable on loans is excluded from the amortized cost basis of financing receivables for the purpose of determining the allowance for credit losses. ​ ACL on Unfunded Loan Commitments ​ The Company estimates expected credit losses over the contractual period in which the Company is exposed to credit risk by a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The ACL related to off-balance sheet credit exposures, which is within other liabilities on the Company’s Consolidated Balance Sheets, is estimated at each balance sheet date under the CECL model, and is adjusted as determined necessary through the provision for credit losses on the income statement. The estimate for ACL on unfunded loan commitments includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on commitments expected to be funded over its estimated life.
Real estate - construction | Real estate - commercial loans
Summary of Significant Accounting Policies
Loans	Real estate - construction loans

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2023
Acquisition
Summary of acquisition	​ ​ ​ ​ ​ West Suburban Acquisition Summary As of Date of Acquisition ​ ​ ​ ​ ​ ​ December 1, 2021 Assets ​ ​ ​ Cash and due from banks ​ $ 16,794 Interest bearing deposits with financial institutions ​ ​ 232,880 Securities available-for-sale and held-to maturity, at fair value ​ ​ 1,067,517 FHLBC stock ​ ​ 3,340 Loans, net of allowance for credit losses Day One PCD loan adjustment ​ ​ 1,500,974 Premises and equipment ​ ​ 47,456 Other real estate owned ​ ​ 5,552 Core deposit intangible ​ ​ 14,772 Deferred tax assets ​ ​ 5,819 Other assets ​ ​ 48,838 Total assets ​ $ 2,943,942 ​ ​ ​ ​ Liabilities ​ ​ ​ Noninterest bearing demand ​ $ 1,070,980 Savings, NOW and money market ​ ​ 1,408,051 Time ​ ​ 215,205 Total deposits ​ ​ 2,694,236 Reserve for unfunded commitments ​ ​ 1,787 Other liabilities ​ ​ 20,629 Total liabilities ​ ​ 2,716,652 ​ ​ ​ ​ Cash consideration paid ​ ​ 100,679 Stock issued for acquisition ​ ​ 194,484 Total Liabilities Assumed and Cash and Stock Consideration Paid for Acquisition ​ $ 3,011,815 Goodwill ​ $ 67,873
Schedule of Purchase price of loans at acquisition	​ ​ ​ ​ ​ ​ ​ As of West Suburban Acquired PCD Loans ​ December 1, 2021 Par value of acquired loans ​ $ 108,241 Allowance for credit losses ​ ​ (12,075) Non-credit discount ​ ​ (1,723) Purchase price of PCD loans at acquisition ​ $ 94,443
Schedule of Unaudited Pro Forma	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unaudited Pro Forma for the Years Ended ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ 2020 Net interest income ​ ​ ​ ​ ​ ​ ​ ​ ​ $ 166,495 ​ $ 165,283 Noninterest income ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 59,036 ​ ​ 48,937 Net income attributable to Old Second Bancorp, Inc. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 67,779 ​ ​ 12,349 ​
Schedule of carrying amount of acquired loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Acquired Loan Detail ​ As of December 31, 2023 ​ ​ As of December 31, 2022 ​ ​ PCD ​ Non-PCD ​ Total ​ ​ PCD ​ Non-PCD ​ Total West Suburban acquired loans ​ $ 54,123 ​ $ 822,078 ​ $ 876,201 ​ ​ $ 75,396 ​ $ 1,059,363 ​ $ 1,134,759 ABC Bank acquired loans ​ ​ 1,602 ​ ​ 21,556 ​ ​ 23,158 ​ ​ ​ 1,786 ​ ​ 31,895 ​ ​ 33,681 Talmer Bank acquired loans ​ ​ - ​ ​ 12,193 ​ ​ 12,193 ​ ​ ​ - ​ ​ 15,693 ​ ​ 15,693 Total acquired loans net book value ​ $ 55,725 ​ $ 855,827 ​ $ 911,552 ​ ​ $ 77,182 ​ $ 1,106,951 ​ $ 1,184,133 Accretion recorded on acquired loans year to date ​ $ 668 ​ $ 1,684 ​ $ 2,352 ​ ​ $ 848 ​ $ 4,726 ​ $ 5,574 Accretion recorded on acquired unfunded commitments year to date ​ ​ ​ ​ ​ ​ ​ $ 819 ​ ​ ​ ​ ​ ​ ​ ​ $ 893

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2023
Securities
Schedule of amortized cost and fair value of the securities portfolio and corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive loss	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2023 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 174,602 ​ $ - ​ $ (5,028) ​ $ 169,574 U.S. government agencies ​ ​ 60,011 ​ ​ - ​ ​ (3,052) ​ ​ 56,959 U.S. government agencies mortgage-backed ​ ​ 118,492 ​ ​ - ​ ​ (12,122) ​ ​ 106,370 States and political subdivisions ​ ​ 238,440 ​ ​ 1,325 ​ ​ (10,430) ​ ​ 229,335 Collateralized mortgage obligations ​ ​ 442,987 ​ ​ 421 ​ ​ (50,864) ​ ​ 392,544 Asset-backed securities ​ ​ 69,248 ​ ​ 42 ​ ​ (3,124) ​ ​ 66,166 Collateralized loan obligations ​ ​ 173,201 ​ ​ 30 ​ ​ (1,350) ​ ​ 171,881 Total securities available-for-sale ​ $ 1,276,981 ​ $ 1,818 ​ $ (85,970) ​ $ 1,192,829 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2022 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 224,054 ​ $ - ​ $ (11,925) ​ $ 212,129 U.S. government agencies ​ ​ 61,178 ​ ​ - ​ ​ (5,130) ​ ​ 56,048 U.S. government agencies mortgage-backed ​ ​ 140,588 ​ ​ - ​ ​ (15,598) ​ ​ 124,990 States and political subdivisions ​ ​ 239,999 ​ ​ 363 ​ ​ (14,234) ​ ​ 226,128 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (378) ​ ​ 9,622 Collateralized mortgage obligations ​ ​ 596,336 ​ ​ 1 ​ ​ (62,569) ​ ​ 533,768 Asset-backed securities ​ ​ 210,388 ​ ​ 6 ​ ​ (8,466) ​ ​ 201,928 Collateralized loan obligations ​ ​ 180,276 ​ ​ - ​ ​ (5,530) ​ ​ 174,746 Total securities available-for-sale ​ $ 1,662,819 ​ $ 370 ​ $ (123,830) ​ $ 1,539,359 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $6.6 million and $6.8 million at December 31, 2023 and December 31, 2022, respectively, that is recorded in other assets on the consolidated balance sheets.
Schedule of fair value, amortized cost and weighted average yield of debt securities by contractual maturity along with securities not due at a single maturity date, primarily mortgage-backed securities (MBS), asset-backed securities, and collateralized loan obligations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ ​ ​ Amortized ​ Average ​ ​ Fair ​ Securities available-for-sale Cost Yield ​ Value Due in one year or less ​ $ 150,067 ​ 1.06 % ​ $ 146,728 ​ Due after one year through five years ​ ​ 99,527 ​ 1.36 ​ ​ ​ 94,572 ​ Due after five years through ten years ​ ​ 59,571 ​ 2.92 ​ ​ ​ 55,005 ​ Due after ten years ​ ​ 163,888 ​ 3.11 ​ ​ ​ 159,563 ​ ​ ​ ​ 473,053 ​ 2.07 ​ ​ ​ 455,868 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 561,479 ​ 2.42 ​ ​ ​ 498,914 ​ Asset-backed securities ​ ​ 69,248 ​ 4.35 ​ ​ ​ 66,166 ​ Collateralized loan obligations ​ ​ 173,201 ​ 7.14 ​ ​ ​ 171,881 ​ Total securities available-for-sale ​ $ 1,276,981 ​ 3.03 % ​ $ 1,192,829 ​
Schedule of securities with unrealized losses aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position	Securities with unrealized losses with no corresponding allowance for credit losses at December 31, 2023 and 2022 aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair ​ Number of ​ Unrealized ​ Fair Securities available-for-sale Securities Losses Value Securities Losses Value Securities Losses Value U.S. Treasuries ​ - ​ $ - ​ $ - ​ 4 ​ $ 5,028 ​ $ 169,574 ​ 4 ​ $ 5,028 ​ $ 169,574 U.S. government agencies ​ - ​ ​ - ​ ​ - ​ 9 ​ ​ 3,052 ​ ​ 56,959 ​ 9 ​ ​ 3,052 ​ ​ 56,959 U.S. government agencies mortgage-backed ​ - ​ ​ - ​ ​ - ​ 128 ​ ​ 12,122 ​ ​ 106,370 ​ 128 ​ ​ 12,122 ​ ​ 106,370 States and political subdivisions ​ 12 ​ ​ 137 ​ ​ 27,974 ​ 27 ​ ​ 10,293 ​ ​ 108,408 ​ 39 ​ ​ 10,430 ​ ​ 136,382 Collateralized mortgage obligations ​ 2 ​ ​ 8 ​ ​ 734 ​ 143 ​ ​ 50,856 ​ ​ 376,236 ​ 145 ​ ​ 50,864 ​ ​ 376,970 Asset-backed securities ​ - ​ ​ - ​ ​ - ​ 17 ​ ​ 3,124 ​ ​ 61,671 ​ 17 ​ ​ 3,124 ​ ​ 61,671 Collateralized loan obligations ​ - ​ ​ - ​ ​ - ​ 25 ​ ​ 1,350 ​ ​ 150,902 ​ 25 ​ ​ 1,350 ​ ​ 150,902 Total securities available-for-sale ​ 14 ​ $ 145 ​ $ 28,708 ​ 353 ​ $ 85,825 ​ $ 1,030,120 ​ 367 ​ $ 85,970 ​ $ 1,058,828 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ in an unrealized loss position ​ in an unrealized loss position ​ Total ​ ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair ​ Number of ​ Unrealized ​ ​ Fair Securities available-for-sale Securities Losses ​ Value Securities Losses ​ Value Securities Losses ​ Value U.S. Treasuries ​ 1 ​ $ 1,025 ​ $ 24,121 ​ 4 ​ $ 10,900 ​ $ 188,008 ​ 5 ​ $ 11,925 ​ $ 212,129 U.S. government agencies ​ - ​ ​ - ​ ​ - ​ 9 ​ ​ 5,130 ​ ​ 56,048 ​ 9 ​ ​ 5,130 ​ ​ 56,048 U.S. government agencies mortgage-backed ​ 15 ​ ​ 975 ​ ​ 11,369 ​ 117 ​ ​ 14,623 ​ ​ 113,621 ​ 132 ​ ​ 15,598 ​ ​ 124,990 States and political subdivisions ​ 45 ​ ​ 5,800 ​ ​ 128,770 ​ 15 ​ ​ 8,434 ​ ​ 48,877 ​ 60 ​ ​ 14,234 ​ ​ 177,647 Corporate bonds ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 378 ​ ​ 9,622 ​ 2 ​ ​ 378 ​ ​ 9,622 Collateralized mortgage obligations ​ 80 ​ ​ 12,895 ​ ​ 180,624 ​ 120 ​ ​ 49,674 ​ ​ 348,880 ​ 200 ​ ​ 62,569 ​ ​ 529,504 Asset-backed securities ​ 30 ​ ​ 3,030 ​ ​ 121,915 ​ 21 ​ ​ 5,436 ​ ​ 79,659 ​ 51 ​ ​ 8,466 ​ ​ 201,574 Collateralized loan obligations ​ 23 ​ ​ 3,579 ​ ​ 112,772 ​ 11 ​ ​ 1,951 ​ ​ 61,974 ​ 34 ​ ​ 5,530 ​ ​ 174,746 Total securities available-for-sale ​ 194 ​ $ 27,304 ​ $ 579,571 ​ 299 ​ $ 96,526 ​ $ 906,689 ​ 493 ​ $ 123,830 ​ $ 1,486,260 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of securities available for sale net realized gains (losses)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ ​ December 31, ​ Securities available-for-sale 2023 2022 2021 ​ Proceeds from sales of securities ​ $ 205,738 ​ $ 30,981 ​ $ 605,846 ​ Gross realized gains on securities ​ - ​ - ​ 270 ​ Gross realized losses on securities ​ (4,148) ​ (944) ​ (38) ​ Net realized (losses) gains ​ $ (4,148) ​ $ (944) ​ $ 232 ​ Income tax benefit (expense) on net realized (losses) gains ​ $ 1,117 ​ $ 265 ​ $ (65) ​ Effective tax rate applied ​ ​ 26.9 % ​ 28.1 % ​ 28.0 ​ ​

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	12 Months Ended
	Dec. 31, 2023
Loans and Allowance for Credit Losses on Loans
Schedule of major classifications of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 December 31, 2022 Commercial ​ $ 841,697 ​ $ 840,964 Leases ​ ​ 398,223 ​ ​ 277,385 Commercial real estate – investor ​ ​ 1,034,424 ​ ​ 987,635 Commercial real estate – owner occupied ​ ​ 796,538 ​ ​ 854,879 Construction ​ ​ 165,380 ​ ​ 180,535 Residential real estate – investor ​ ​ 52,595 ​ ​ 57,353 Residential real estate – owner occupied ​ ​ 226,248 ​ ​ 219,718 Multifamily ​ ​ 401,696 ​ ​ 323,691 HELOC ​ ​ 103,237 ​ ​ 109,202 Other 1 ​ ​ 22,915 ​ ​ 18,247 Total loans ​ ​ 4,042,953 ​ ​ 3,869,609 Allowance for credit losses on loans ​ ​ (44,264) ​ ​ (49,480) Net loans 2 ​ $ 3,998,689 ​ $ 3,820,129 ​ 1 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 5 - Loans and Allowance for Credit Losses on Loans. ​ 2 Excludes accrued interest receivable of $ 20.5 million and $15.9 million at December 31, 2023 and December 31, 2022, respectively, which is recorded in other assets on the consolidated balance sheets.
Schedule of changes in the allowance for loan losses by segment of loans based on method of impairment	​ ​ The following tables represent the activity in the ACL for loans for the years ended December 31, 2023, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses January 1, 2023 Credit Losses Charge-offs Recoveries December 31, 2023 Commercial ​ $ 11,968 ​ $ (7,717) ​ $ 885 ​ $ 632 ​ $ 3,998 Leases ​ ​ 2,865 ​ ​ 850 ​ ​ 882 ​ ​ 119 ​ ​ 2,952 Commercial real estate – investor ​ ​ 10,674 ​ ​ 18,170 ​ ​ 11,816 ​ ​ 77 ​ ​ 17,105 Commercial real estate – owner occupied ​ ​ 15,001 ​ ​ 7,941 ​ ​ 10,691 ​ ​ 29 ​ ​ 12,280 Construction ​ ​ 1,546 ​ ​ (608) ​ ​ - ​ ​ 100 ​ ​ 1,038 Residential real estate – investor ​ ​ 768 ​ ​ (129) ​ ​ - ​ ​ 30 ​ ​ 669 Residential real estate – owner occupied ​ ​ 2,046 ​ ​ (304) ​ ​ - ​ ​ 79 ​ ​ 1,821 Multifamily ​ ​ 2,453 ​ ​ 275 ​ ​ - ​ ​ - ​ ​ 2,728 HELOC ​ ​ 1,806 ​ ​ (255) ​ ​ - ​ ​ 105 ​ ​ 1,656 Other ​ ​ 353 ​ ​ (137) ​ ​ 368 ​ ​ 169 ​ ​ 17 Total ​ $ 49,480 ​ $ 18,086 ​ $ 24,642 ​ $ 1,340 ​ $ 44,264 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending Allowance for credit losses ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance ​ January 1, 2022 Credit Losses Charge-offs Recoveries December 31, 2022 Commercial ​ $ 11,751 ​ $ 273 ​ $ 151 ​ $ 95 ​ $ 11,968 Leases ​ ​ 3,480 ​ ​ (246) ​ ​ 371 ​ ​ 2 ​ ​ 2,865 Commercial real estate – investor ​ ​ 10,795 ​ ​ 1,199 ​ ​ 1,401 ​ ​ 81 ​ ​ 10,674 Commercial real estate – owner occupied ​ ​ 4,913 ​ ​ 10,117 ​ ​ 133 ​ ​ 104 ​ ​ 15,001 Construction ​ ​ 3,373 ​ ​ (1,827) ​ ​ - ​ ​ - ​ ​ 1,546 Residential real estate – investor ​ ​ 760 ​ ​ (22) ​ ​ - ​ ​ 30 ​ ​ 768 Residential real estate – owner occupied ​ ​ 2,832 ​ ​ (1,010) ​ ​ 2 ​ ​ 226 ​ ​ 2,046 Multifamily ​ ​ 3,675 ​ ​ (1,285) ​ ​ - ​ ​ 63 ​ ​ 2,453 HELOC ​ ​ 2,510 ​ ​ (844) ​ ​ - ​ ​ 140 ​ ​ 1,806 Other ​ ​ 192 ​ ​ 395 ​ ​ 402 ​ ​ 168 ​ ​ 353 Total ​ $ 44,281 ​ $ 6,750 ​ $ 2,460 ​ $ 909 ​ $ 49,480 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ ​ Impact of Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ ​ WSB Acquisition (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses January 1, 2021 ​ with PCD Loans Credit Losses Charge-offs Recoveries December 31, 2021 Commercial ​ $ 2,812 ​ ​ 7,161 ​ $ 2,389 ​ $ 963 ​ $ 352 ​ $ 11,751 Leases ​ ​ 3,888 ​ ​ - ​ ​ (339) ​ ​ 69 ​ ​ - ​ ​ 3,480 Commercial real estate – Investor ​ ​ 7,899 ​ ​ 1,877 ​ ​ 3,665 ​ ​ 2,724 ​ ​ 78 ​ ​ 10,795 Commercial real estate – Owner occupied ​ ​ 3,557 ​ ​ 2,771 ​ ​ 147 ​ ​ 1,797 ​ ​ 235 ​ ​ 4,913 Construction ​ ​ 4,054 ​ ​ 102 ​ ​ (783) ​ ​ - ​ ​ - ​ ​ 3,373 Residential real estate – Investor ​ ​ 1,740 ​ ​ 23 ​ ​ (1,294) ​ ​ - ​ ​ 291 ​ ​ 760 Residential real estate – Owner occupied ​ ​ 2,714 ​ ​ 136 ​ ​ (176) ​ ​ - ​ ​ 158 ​ ​ 2,832 Multifamily ​ ​ 3,625 ​ ​ - ​ ​ 233 ​ ​ 183 ​ ​ - ​ ​ 3,675 HELOC ​ ​ 1,948 ​ ​ 5 ​ ​ 340 ​ ​ 17 ​ ​ 234 ​ ​ 2,510 Other ​ ​ 1,618 ​ ​ - ​ ​ (1,387) ​ ​ 180 ​ ​ 141 ​ ​ 192 Total ​ $ 33,855 ​ $ 12,075 ​ $ 2,795 ​ $ 5,933 ​ $ 1,489 ​ $ 44,281 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of collateral dependent loans and related loan allowances.	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2023 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 837 ​ $ 797 ​ $ - ​ $ - ​ $ 1,634 ​ $ 2 Leases ​ ​ - ​ ​ - ​ ​ 321 ​ ​ - ​ ​ 321 ​ ​ 320 Commercial real estate – investor ​ ​ 15,735 ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,735 ​ ​ 3,656 Commercial real estate – owner occupied ​ ​ 34,894 ​ ​ - ​ ​ - ​ ​ - ​ ​ 34,894 ​ ​ 3,900 Construction ​ ​ 7,162 ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,162 ​ ​ - Residential real estate – investor ​ ​ 422 ​ ​ - ​ ​ - ​ ​ - ​ ​ 422 ​ ​ - Residential real estate – owner occupied ​ ​ 1,506 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,506 ​ ​ - Multifamily ​ ​ 1,402 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,402 ​ ​ - HELOC ​ ​ 39 ​ ​ - ​ ​ - ​ ​ - ​ ​ 39 ​ ​ - Total ​ $ 61,997 ​ $ 797 ​ $ 321 ​ $ - ​ $ 63,115 ​ $ 7,878 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2022 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 883 ​ $ 5,915 ​ $ - ​ $ 364 ​ $ 7,162 ​ $ 569 Leases ​ ​ - ​ ​ - ​ ​ 1,248 ​ ​ - ​ ​ 1,248 ​ ​ 1,248 Commercial real estate – investor ​ ​ 16,576 ​ ​ - ​ ​ - ​ ​ - ​ ​ 16,576 ​ ​ 2,875 Commercial real estate – owner occupied ​ ​ 19,188 ​ ​ - ​ ​ - ​ ​ 2,310 ​ ​ 21,498 ​ ​ 5,808 Residential real estate – investor ​ ​ 675 ​ ​ - ​ ​ - ​ ​ - ​ ​ 675 ​ ​ - Residential real estate – owner occupied ​ ​ 1,817 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,817 ​ ​ 244 Multifamily ​ ​ 1,322 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,322 ​ ​ - HELOC ​ ​ 180 ​ ​ - ​ ​ - ​ ​ - ​ ​ 180 ​ ​ - Total ​ $ 40,641 ​ $ 5,915 ​ $ 1,248 ​ $ 2,674 ​ $ 50,478 ​ $ 10,744 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of aged analysis of past due loans by class of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2023 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ $982 ​ $ - ​ $ $1,228 ​ $ $2,210 ​ $ 839,487 ​ $ 841,697 ​ $ 1,155 Leases ​ ​ 599 ​ ​ - ​ ​ 347 ​ ​ 946 ​ ​ 397,277 ​ ​ 398,223 ​ ​ - Commercial real estate – investor ​ ​ 1,209 ​ ​ - ​ ​ 6,087 ​ ​ 7,296 ​ ​ 1,027,128 ​ ​ 1,034,424 ​ ​ - Commercial real estate – owner occupied ​ ​ 2,103 ​ ​ 3,726 ​ ​ 15,645 ​ ​ 21,474 ​ ​ 775,064 ​ ​ 796,538 ​ ​ - Construction ​ ​ 2,540 ​ ​ 307 ​ ​ 7,161 ​ ​ 10,008 ​ ​ 155,372 ​ ​ 165,380 ​ ​ - Residential real estate – investor ​ ​ 540 ​ ​ 579 ​ ​ 168 ​ ​ 1,287 ​ ​ 51,308 ​ ​ 52,595 ​ ​ - Residential real estate – owner occupied ​ ​ 553 ​ ​ 125 ​ ​ 1,944 ​ ​ 2,622 ​ ​ 223,626 ​ ​ 226,248 ​ ​ - Multifamily ​ ​ 1,085 ​ ​ - ​ ​ 233 ​ ​ 1,318 ​ ​ 400,378 ​ ​ 401,696 ​ ​ - HELOC ​ ​ 565 ​ ​ 1,396 ​ ​ 269 ​ ​ 2,230 ​ ​ 101,007 ​ ​ 103,237 ​ ​ 41 Other ​ ​ - ​ ​ 1 ​ ​ - ​ ​ 1 ​ ​ 22,914 ​ ​ 22,915 ​ ​ - Total ​ $ 10,176 ​ $ 6,134 ​ $ 33,082 ​ $ 49,392 ​ $ 3,993,561 ​ $ 4,042,953 ​ $ 1,196 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2022 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3 ​ $ 1,012 ​ $ 825 ​ $ 1,840 ​ $ 839,124 ​ $ 840,964 ​ $ 460 Leases ​ ​ 447 ​ ​ 22 ​ ​ 614 ​ ​ 1,083 ​ ​ 276,302 ​ ​ 277,385 ​ ​ - Commercial real estate – investor ​ ​ 3,276 ​ ​ 1,276 ​ ​ 4,315 ​ ​ 8,867 ​ ​ 978,768 ​ ​ 987,635 ​ ​ - Commercial real estate – owner occupied ​ ​ 373 ​ ​ 113 ​ ​ 2,211 ​ ​ 2,697 ​ ​ 852,182 ​ ​ 854,879 ​ ​ 173 Construction ​ ​ 14 ​ ​ - ​ ​ 116 ​ ​ 130 ​ ​ 180,405 ​ ​ 180,535 ​ ​ - Residential real estate – investor ​ ​ 445 ​ ​ - ​ ​ 987 ​ ​ 1,432 ​ ​ 55,921 ​ ​ 57,353 ​ ​ 144 Residential real estate – owner occupied ​ ​ 1,191 ​ ​ - ​ ​ 2,232 ​ ​ 3,423 ​ ​ 216,295 ​ ​ 219,718 ​ ​ 485 Multifamily ​ ​ 267 ​ ​ 361 ​ ​ 1,322 ​ ​ 1,950 ​ ​ 321,741 ​ ​ 323,691 ​ ​ - HELOC ​ ​ 291 ​ ​ 90 ​ ​ 392 ​ ​ 773 ​ ​ 108,429 ​ ​ 109,202 ​ ​ - Other ​ ​ 19 ​ ​ - ​ ​ - ​ ​ 19 ​ ​ 18,228 ​ ​ 18,247 ​ ​ - Total ​ $ 6,326 ​ $ 2,874 ​ $ 13,014 ​ $ 22,214 ​ $ 3,847,395 ​ $ 3,869,609 ​ $ 1,262 ​
Schedule of loans on nonaccrual for which there was no related allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nonaccrual loan detail December 31, 2023 With no ACL December 31, 2022 With no ACL Commercial ​ $ 870 ​ $ 870 ​ $ 7,189 ​ $ 6,598 Leases ​ ​ 639 ​ ​ 318 ​ ​ 1,876 ​ ​ - Commercial real estate – investor ​ ​ 16,572 ​ ​ 8,926 ​ ​ 4,346 ​ ​ 4,244 Commercial real estate – owner occupied ​ ​ 34,946 ​ ​ 8,429 ​ ​ 8,050 ​ ​ 3,813 Construction ​ ​ 7,162 ​ ​ 7,162 ​ ​ 251 ​ ​ - Residential real estate – investor ​ ​ 1,331 ​ ​ 1,331 ​ ​ 1,528 ​ ​ 675 Residential real estate – owner occupied ​ ​ 3,078 ​ ​ 3,078 ​ ​ 3,713 ​ ​ 1,572 Multifamily ​ ​ 1,775 ​ ​ 1,775 ​ ​ 2,538 ​ ​ 1,322 HELOC ​ ​ 1,210 ​ ​ 1,210 ​ ​ 2,109 ​ ​ 180 Other ​ ​ - ​ ​ - ​ ​ 2 ​ ​ - Total ​ $ 67,583 ​ $ 33,099 ​ $ 31,602 ​ $ 18,404
Schedule of credit quality indicators by class of loans	Credit quality indicators by class of loans as of December 31, 2023 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 318,569 ​ $ 136,668 ​ $ 35,901 ​ $ 11,983 ​ $ 18,390 ​ $ 3,426 ​ $ 298,931 ​ $ 1,408 ​ $ 825,276 Special Mention ​ ​ - ​ ​ 2,737 ​ ​ 707 ​ ​ 171 ​ ​ - ​ ​ - ​ ​ 4,392 ​ ​ - ​ ​ 8,007 Substandard ​ ​ - ​ ​ 2,099 ​ ​ 146 ​ ​ - ​ ​ 199 ​ ​ - ​ ​ 5,970 ​ ​ - ​ ​ 8,414 Total commercial ​ ​ 318,569 ​ ​ 141,504 ​ ​ 36,754 ​ ​ 12,154 ​ ​ 18,589 ​ ​ 3,426 ​ ​ 309,293 ​ ​ 1,408 ​ ​ 841,697 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 219,163 ​ ​ 113,074 ​ $ 42,275 ​ ​ 14,663 ​ ​ 6,975 ​ ​ 1,255 ​ ​ - ​ ​ - ​ ​ 397,405 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 407 ​ ​ 203 ​ ​ - ​ ​ 208 ​ ​ - ​ ​ - ​ ​ - ​ ​ 818 Total leases ​ ​ 219,163 ​ ​ 113,481 ​ ​ 42,478 ​ ​ 14,663 ​ ​ 7,183 ​ ​ 1,255 ​ ​ - ​ ​ - ​ ​ 398,223 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 159,654 ​ ​ 367,512 ​ ​ 218,084 ​ ​ 108,384 ​ ​ 54,322 ​ ​ 63,281 ​ ​ 8,122 ​ ​ - ​ ​ 979,359 Special Mention ​ ​ - ​ ​ - ​ ​ 11,267 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 11,267 Substandard ​ ​ - ​ ​ - ​ ​ 838 ​ ​ 5,327 ​ ​ 15,658 ​ ​ 9,648 ​ ​ 12,327 ​ ​ - ​ ​ 43,798 Total commercial real estate – investor ​ ​ 159,654 ​ ​ 367,512 ​ ​ 230,189 ​ ​ 113,711 ​ ​ 69,980 ​ ​ 72,929 ​ ​ 20,449 ​ ​ - ​ ​ 1,034,424 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 124,059 ​ ​ 134,383 ​ ​ 177,553 ​ ​ 103,109 ​ ​ 42,839 ​ ​ 91,062 ​ ​ 33,243 ​ ​ - ​ ​ 706,248 Special Mention ​ ​ 1,650 ​ ​ 17,415 ​ ​ 9,585 ​ ​ 3,128 ​ ​ 218 ​ ​ 3,681 ​ ​ - ​ ​ - ​ ​ 35,677 Substandard ​ ​ - ​ ​ 14,630 ​ ​ 18,817 ​ ​ 4,571 ​ ​ 14,809 ​ ​ 1,786 ​ ​ - ​ ​ - ​ ​ 54,613 Total commercial real estate – owner occupied ​ ​ 125,709 ​ ​ 166,428 ​ ​ 205,955 ​ ​ 110,808 ​ ​ 57,866 ​ ​ 96,529 ​ ​ 33,243 ​ ​ - ​ ​ 796,538 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 42,808 ​ ​ 66,513 ​ ​ 32,942 ​ ​ 100 ​ ​ 1,593 ​ ​ 1,083 ​ ​ 3,186 ​ ​ - ​ ​ 148,225 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 9,993 ​ ​ - ​ ​ 7,162 ​ ​ - ​ ​ - ​ ​ 17,155 Total construction ​ ​ 42,808 ​ ​ 66,513 ​ ​ 32,942 ​ ​ 10,093 ​ ​ 1,593 ​ ​ 8,245 ​ ​ 3,186 ​ ​ - ​ ​ 165,380 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 5,062 ​ ​ 14,434 ​ ​ 9,027 ​ ​ 6,227 ​ ​ 6,508 ​ ​ 8,469 ​ ​ 1,471 ​ ​ - ​ ​ 51,198 Special Mention ​ ​ - ​ ​ - ​ ​ 66 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 66 Substandard ​ ​ - ​ ​ 390 ​ ​ - ​ ​ - ​ ​ 408 ​ ​ 533 ​ ​ - ​ ​ - ​ ​ 1,331 Total residential real estate – investor ​ ​ 5,062 ​ ​ 14,824 ​ ​ 9,093 ​ ​ 6,227 ​ ​ 6,916 ​ ​ 9,002 ​ ​ 1,471 ​ ​ - ​ ​ 52,595 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 32,574 ​ ​ 41,528 ​ ​ 40,335 ​ ​ 25,322 ​ ​ 14,233 ​ ​ 68,277 ​ ​ 763 ​ ​ - ​ ​ 223,032 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 191 ​ ​ 685 ​ ​ 2,340 ​ ​ - ​ ​ - ​ ​ 3,216 Total residential real estate – owner occupied ​ ​ 32,574 ​ ​ 41,528 ​ ​ 40,335 ​ ​ 25,513 ​ ​ 14,918 ​ ​ 70,617 ​ ​ 763 ​ ​ - ​ ​ 226,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 55,310 ​ ​ 79,060 ​ ​ 123,834 ​ ​ 72,539 ​ ​ 12,231 ​ ​ 40,825 ​ ​ 562 ​ ​ - ​ ​ 384,361 Special Mention ​ ​ - ​ ​ 168 ​ ​ 13,425 ​ ​ 322 ​ ​ 1,645 ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,560 Substandard ​ ​ - ​ ​ 1,009 ​ ​ - ​ ​ - ​ ​ - ​ ​ 766 ​ ​ - ​ ​ - ​ ​ 1,775 Total multifamily ​ ​ 55,310 ​ ​ 80,237 ​ ​ 137,259 ​ ​ 72,861 ​ ​ 13,876 ​ ​ 41,591 ​ ​ 562 ​ ​ - ​ ​ 401,696 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,735 ​ ​ 2,679 ​ ​ 490 ​ ​ 1,757 ​ ​ 1,756 ​ ​ 2,995 ​ ​ 89,161 ​ ​ - ​ ​ 101,573 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 25 ​ ​ 1 ​ ​ 41 ​ ​ 24 ​ ​ 184 ​ ​ 1,389 ​ ​ - ​ ​ 1,664 Total HELOC ​ ​ 2,735 ​ ​ 2,704 ​ ​ 491 ​ ​ 1,798 ​ ​ 1,780 ​ ​ 3,179 ​ ​ 90,550 ​ ​ - ​ ​ 103,237 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 4,060 ​ ​ 2,278 ​ ​ 1,569 ​ ​ 153 ​ ​ 85 ​ ​ 73 ​ ​ 14,697 ​ ​ - ​ ​ 22,915 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Total other ​ ​ 4,060 ​ ​ 2,278 ​ ​ 1,569 ​ ​ 153 ​ ​ 85 ​ ​ 73 ​ ​ 14,697 ​ ​ - ​ ​ 22,915 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 963,994 ​ ​ 958,129 ​ ​ 682,010 ​ ​ 344,237 ​ ​ 158,932 ​ ​ 280,746 ​ ​ 450,136 ​ ​ 1,408 ​ ​ 3,839,592 Special Mention ​ ​ 1,650 ​ ​ 20,320 ​ ​ 35,050 ​ ​ 3,621 ​ ​ 1,863 ​ ​ 3,681 ​ ​ 4,392 ​ ​ - ​ ​ 70,577 Substandard ​ ​ - ​ ​ 18,560 ​ ​ 20,005 ​ ​ 20,123 ​ ​ 31,991 ​ ​ 22,419 ​ ​ 19,686 ​ ​ - ​ ​ 132,784 Total loans ​ $ 965,644 ​ $ 997,009 ​ $ 737,065 ​ $ 367,981 ​ $ 192,786 ​ $ 306,846 ​ $ 474,214 ​ $ 1,408 ​ $ 4,042,953 ​ Credit quality indicators by class of loans as of December 31, 2022 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 2019 2018 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 222,856 ​ $ 72,808 ​ $ 21,597 ​ $ 12,742 ​ $ 6,957 ​ $ 2,651 ​ $ 447,821 ​ $ - ​ $ 787,432 Special Mention ​ ​ 1,701 ​ ​ 446 ​ ​ 1,182 ​ ​ 2,432 ​ ​ - ​ ​ - ​ ​ 21,286 ​ ​ - ​ ​ 27,047 Substandard ​ ​ - ​ ​ 2,447 ​ ​ 3,139 ​ ​ 12,176 ​ ​ 4,807 ​ ​ - ​ ​ 3,916 ​ ​ - ​ ​ 26,485 Total commercial ​ ​ 224,557 ​ ​ 75,701 ​ ​ 25,918 ​ ​ 27,350 ​ ​ 11,764 ​ ​ 2,651 ​ ​ 473,023 ​ ​ - ​ ​ 840,964 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 161,379 ​ ​ 64,203 ​ $ 26,995 ​ ​ 17,653 ​ ​ 4,449 ​ ​ 830 ​ ​ - ​ ​ - ​ ​ 275,509 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 1,606 ​ ​ - ​ ​ - ​ ​ 270 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,876 Total leases ​ ​ 162,985 ​ ​ 64,203 ​ ​ 26,995 ​ ​ 17,923 ​ ​ 4,449 ​ ​ 830 ​ ​ - ​ ​ - ​ ​ 277,385 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 382,311 ​ ​ 229,155 ​ ​ 133,215 ​ ​ 76,846 ​ ​ 46,935 ​ ​ 51,995 ​ ​ 7,113 ​ ​ - ​ ​ 927,570 Special Mention ​ ​ - ​ ​ 6,766 ​ ​ 5,490 ​ ​ 10,206 ​ ​ 1,070 ​ ​ 9,123 ​ ​ - ​ ​ - ​ ​ 32,655 Substandard ​ ​ - ​ ​ 71 ​ ​ - ​ ​ 25,042 ​ ​ - ​ ​ 2,297 ​ ​ - ​ ​ - ​ ​ 27,410 Total commercial real estate – investor ​ ​ 382,311 ​ ​ 235,992 ​ ​ 138,705 ​ ​ 112,094 ​ ​ 48,005 ​ ​ 63,415 ​ ​ 7,113 ​ ​ - ​ ​ 987,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 168,776 ​ ​ 223,731 ​ ​ 105,669 ​ ​ 47,351 ​ ​ 49,597 ​ ​ 87,357 ​ ​ 33,745 ​ ​ - ​ ​ 716,226 Special Mention ​ ​ - ​ ​ 22,242 ​ ​ 48,184 ​ ​ 17,668 ​ ​ 8,661 ​ ​ 1,008 ​ ​ - ​ ​ - ​ ​ 97,763 Substandard ​ ​ 2,309 ​ ​ 15,182 ​ ​ 1,191 ​ ​ 17,865 ​ ​ 853 ​ ​ 3,490 ​ ​ - ​ ​ - ​ ​ 40,890 Total commercial real estate – owner occupied ​ ​ 171,085 ​ ​ 261,155 ​ ​ 155,044 ​ ​ 82,884 ​ ​ 59,111 ​ ​ 91,855 ​ ​ 33,745 ​ ​ - ​ ​ 854,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 52,508 ​ ​ 66,308 ​ ​ 39,542 ​ ​ 2,390 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 163,905 Special Mention ​ ​ - ​ ​ - ​ ​ 15,297 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,297 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,198 ​ ​ - ​ ​ 135 ​ ​ - ​ ​ - ​ ​ 1,333 Total construction ​ ​ 52,508 ​ ​ 66,308 ​ ​ 54,839 ​ ​ 3,588 ​ ​ 226 ​ ​ 1,543 ​ ​ 1,523 ​ ​ - ​ ​ 180,535 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 14,659 ​ ​ 9,910 ​ ​ 6,945 ​ ​ 8,585 ​ ​ 4,853 ​ ​ 9,626 ​ ​ 991 ​ ​ - ​ ​ 55,569 Special Mention ​ ​ - ​ ​ 70 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 70 Substandard ​ ​ 621 ​ ​ - ​ ​ - ​ ​ 499 ​ ​ 186 ​ ​ 408 ​ ​ - ​ ​ - ​ ​ 1,714 Total residential real estate – investor ​ ​ 15,280 ​ ​ 9,980 ​ ​ 6,945 ​ ​ 9,084 ​ ​ 5,039 ​ ​ 10,034 ​ ​ 991 ​ ​ - ​ ​ 57,353 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 41,885 ​ ​ 44,884 ​ ​ 28,418 ​ ​ 16,146 ​ ​ 12,152 ​ ​ 70,741 ​ ​ 1,638 ​ ​ - ​ ​ 215,864 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 22 ​ ​ 237 ​ ​ 968 ​ ​ 131 ​ ​ 2,496 ​ ​ - ​ ​ - ​ ​ 3,854 Total residential real estate – owner occupied ​ ​ 41,885 ​ ​ 44,906 ​ ​ 28,655 ​ ​ 17,114 ​ ​ 12,283 ​ ​ 73,237 ​ ​ 1,638 ​ ​ - ​ ​ 219,718 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 76,877 ​ ​ 126,257 ​ ​ 52,262 ​ ​ 13,125 ​ ​ 39,703 ​ ​ 6,098 ​ ​ 329 ​ ​ - ​ ​ 314,651 Special Mention ​ ​ 377 ​ ​ 3,683 ​ ​ 342 ​ ​ 1,684 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,086 Substandard ​ ​ 1,684 ​ ​ - ​ ​ - ​ ​ - ​ ​ 587 ​ ​ 683 ​ ​ - ​ ​ - ​ ​ 2,954 Total multifamily ​ ​ 78,938 ​ ​ 129,940 ​ ​ 52,604 ​ ​ 14,809 ​ ​ 40,290 ​ ​ 6,781 ​ ​ 329 ​ ​ - ​ ​ 323,691 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 2,760 ​ ​ 517 ​ ​ 1,497 ​ ​ 1,703 ​ ​ 657 ​ ​ 2,288 ​ ​ 97,258 ​ ​ - ​ ​ 106,680 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 111 ​ ​ - ​ ​ 111 Substandard ​ ​ 62 ​ ​ 1 ​ ​ - ​ ​ - ​ ​ 67 ​ ​ 309 ​ ​ 1,972 ​ ​ - ​ ​ 2,411 Total HELOC ​ ​ 2,822 ​ ​ 518 ​ ​ 1,497 ​ ​ 1,703 ​ ​ 724 ​ ​ 2,597 ​ ​ 99,341 ​ ​ - ​ ​ 109,202 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 4,195 ​ ​ 2,835 ​ ​ 432 ​ ​ 167 ​ ​ 69 ​ ​ 111 ​ ​ 10,436 ​ ​ - ​ ​ 18,245 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 1 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1 ​ ​ - ​ ​ 2 Total other ​ ​ 4,195 ​ ​ 2,835 ​ ​ 433 ​ ​ 167 ​ ​ 69 ​ ​ 111 ​ ​ 10,437 ​ ​ - ​ ​ 18,247 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,128,206 ​ ​ 840,608 ​ ​ 416,572 ​ ​ 196,708 ​ ​ 165,598 ​ ​ 233,105 ​ ​ 600,854 ​ ​ - ​ ​ 3,581,651 Special Mention ​ ​ 2,078 ​ ​ 33,207 ​ ​ 70,495 ​ ​ 31,990 ​ ​ 9,731 ​ ​ 10,131 ​ ​ 21,397 ​ ​ - ​ ​ 179,029 Substandard ​ ​ 6,282 ​ ​ 17,723 ​ ​ 4,568 ​ ​ 58,018 ​ ​ 6,631 ​ ​ 9,818 ​ ​ 5,889 ​ ​ - ​ ​ 108,929 Total loans ​ $ 1,136,566 ​ $ 891,538 ​ $ 491,635 ​ $ 286,716 ​ $ 181,960 ​ $ 253,054 ​ $ 628,140 ​ $ - ​ $ 3,869,609
Schedule of gross charge-offs	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Current period gross charge-offs 2023 2022 2021 2020 2019 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ $ - ​ ​ - ​ ​ 466 ​ ​ 364 ​ ​ - ​ ​ 55 ​ $ - ​ $ - ​ $ 885 Leases ​ ​ - ​ ​ 870 ​ ​ - ​ ​ - ​ ​ 12 ​ ​ - ​ ​ - ​ ​ - ​ ​ 882 Commercial real estate – investor ​ ​ 123 ​ ​ 8,352 ​ ​ 71 ​ ​ 3,270 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 11,816 Commercial real estate – owner occupied ​ ​ - ​ ​ 22 ​ ​ 178 ​ ​ 6,947 ​ ​ 3,512 ​ ​ 32 ​ ​ - ​ ​ - ​ ​ 10,691 Construction ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Residential real estate – investor ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Residential real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Multifamily ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - HELOC ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Other ​ ​ - ​ ​ 3 ​ ​ 27 ​ ​ 6 ​ ​ - ​ ​ 332 ​ ​ - ​ ​ - ​ ​ 368 Total ​ $ 123 ​ $ 9,247 ​ $ 742 ​ $ 10,587 ​ $ 3,524 ​ $ 419 ​ ​ - ​ ​ - ​ $ 24,642
Schedule of class of financing receivable	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Term Extension ​ Combination - Term Extension and Interest Rate Reduction ​ Combination - Term Extension and Payment Delay ​ Total Loans Modified ​ % of Total Loan Segment Modified to Total Loan Segment Commercial ​ $ 3,000 ​ $ 979 ​ $ - ​ $ 3,979 ​ 0.5% Commercial real estate – investor ​ ​ 13,521 ​ ​ - ​ ​ 7,646 ​ ​ 21,167 ​ 2.0% Commercial real estate – owner occupied ​ ​ 16,082 ​ ​ - ​ ​ - ​ ​ 16,082 ​ 2.0% Residential real estate – owner occupied ​ ​ 119 ​ ​ - ​ ​ - ​ ​ 119 ​ 0.1% Multifamily ​ ​ 233 ​ ​ - ​ ​ - ​ ​ 233 ​ 0.1% HELOC ​ ​ 166 ​ ​ - ​ ​ - ​ ​ 166 ​ 0.2% Total ​ $ 33,121 ​ $ 979 ​ $ 7,646 ​ $ 41,746 ​ 1.0% ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ 30-59 days past due ​ 60-89 Days Past Due ​ 90 Days or Greater Past Due ​ Total Past Due ​ Current ​ Total Loan Modified Commercial ​ $ - ​ $ - ​ $ 979 ​ $ 979 ​ $ 3,000 ​ $ 3,979 Commercial real estate – investor ​ ​ 838 ​ ​ - ​ ​ - ​ ​ 838 ​ ​ 20,329 ​ ​ 21,167 Commercial real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 16,082 ​ ​ 16,082 Residential real estate – owner occupied ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 119 ​ ​ 119 Multifamily ​ ​ - ​ ​ - ​ ​ 233 ​ ​ 233 ​ ​ - ​ ​ 233 HELOC ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 166 ​ ​ 166 Total ​ $ 838 ​ $ - ​ $ 1,212 ​ $ 2,050 ​ $ 39,696 ​ $ 41,746 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Weighted-Average Term Extension (In Months) ​ Weighted-Average Interest Rate Change ​ Weighted-Average Delay of Payment (In Months) Commercial ​ ​ 8.31 ​ ​ 5.00 % ​ ​ - Commercial real estate – investor ​ ​ 9.96 ​ ​ - ​ ​ ​ 7.00 Commercial real estate – owner occupied ​ ​ 11.65 ​ ​ - ​ ​ ​ - Residential real estate – owner occupied ​ ​ 39.00 ​ ​ - ​ ​ ​ - Multifamily ​ ​ 21.00 ​ ​ - ​ ​ ​ - HELOC ​ ​ 24.00 ​ ​ - ​ ​ ​ - Total ​ ​ 10.65 ​ ​ 5.00 % ​ ​ 7.00
Schedule of loans to principal officers, directors, and their affiliates, made in the ordinary course of business	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Beginning balance ​ $ 8,483 ​ $ 10,162 ​ New loans, including acquired related party loans ​ 30 ​ 267 ​ Repayments and other reductions ​ (30) ​ (1,946) ​ Change in related party status ​ (8,483) ​ - ​ Ending balance ​ $ - ​ $ 8,483 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2023
Other Real Estate Owned
Schedule of activity in the other real estate owned (OREO) portfolio, net of valuation reserve	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, Other real estate owned 2023 2022 ​ 2021 Balance at beginning of period ​ $ 1,561 ​ $ 2,356 ​ $ 2,474 Property additions, net of acquisition adjustments ​ ​ 5,580 ​ ​ 87 ​ ​ 5,748 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and gains/losses ​ ​ 1,749 ​ ​ 778 ​ ​ 5,787 Period valuation write-down ​ ​ 269 ​ ​ 104 ​ ​ 79 Balance at end of period ​ $ 5,123 ​ $ 1,561 ​ $ 2,356
Schedule of activity in valuation allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2023 2022 2021 Balance at beginning of period ​ $ 856 ​ $ 1,179 ​ $ 1,643 Provision for unrealized losses ​ ​ 269 ​ ​ 104 ​ ​ 79 Reductions taken on sales ​ ​ (1,007) ​ ​ (427) ​ ​ (543) Balance at end of period ​ $ 118 ​ $ 856 ​ $ 1,179 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of expenses related to foreclosed assets, net of lease revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2023 2022 ​ 2021 Gain on sales, net ​ $ (256) ​ $ (163) ​ $ (41) Provision for unrealized losses ​ ​ 269 ​ ​ 104 ​ ​ 79 Operating expenses ​ ​ 434 ​ ​ 193 ​ ​ 133 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 48 ​ ​ 4 ​ ​ 4 Net OREO expense ​ $ 399 ​ $ 130 ​ $ 167 ​

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2023
Premises and Equipment
Schedule of components of premises and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ ​ Land ​ $ 29,741 ​ $ - ​ $ 29,741 ​ $ 29,741 ​ $ - ​ $ 29,741 ​ ​ Buildings ​ 58,311 ​ 25,911 ​ 32,400 ​ 54,075 ​ 24,427 ​ 29,648 ​ ​ Leasehold improvements ​ 7,785 ​ 1,574 ​ 6,211 ​ 2,790 ​ 1,280 ​ 1,510 ​ ​ Furniture and equipment ​ 57,447 ​ 46,489 ​ 10,958 ​ 58,183 ​ ​ 46,727 ​ 11,456 ​ ​ Total Premises and Equipment ​ $ 153,284 ​ $ 73,974 ​ $ 79,310 ​ $ 144,789 ​ $ 72,434 ​ $ 72,355 ​ ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2023
Deposits
Schedule of major classifications of deposits	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Noninterest bearing demand ​ $ 1,834,891 ​ $ 2,051,702 ​ Savings ​ ​ 971,334 ​ ​ 1,145,592 ​ NOW accounts ​ ​ 565,375 ​ ​ 609,338 ​ Money market accounts ​ ​ 671,240 ​ ​ 862,170 ​ Certificates of deposit of less than $100,000 ​ ​ 266,035 ​ ​ 244,017 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 180,289 ​ ​ 157,438 ​ Certificates of deposit of more than $250,000 ​ ​ 81,582 ​ ​ 40,466 ​ Total deposits ​ $ 4,570,746 ​ $ 5,110,723 ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of scheduled maturities of time deposits	​ ​ ​ ​ ​ ​ 2024 $ 435,491 ​ 2025 ​ 63,409 ​ 2026 ​ 15,097 ​ 2027 ​ 5,401 ​ 2028 ​ 8,508 ​ Total time deposits ​ $ 527,906 ​ ​

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2023
Borrowings
Summary of borrowings and junior subordinated debentures	The following table is a summary of borrowings as of December 31, 2023 and 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Securities sold under repurchase agreements ​ ​ $ 26,470 ​ $ 32,156 ​ Other short-term borrowings ​ ​ ​ 405,000 ​ ​ 90,000 ​ Junior subordinated debentures 1 ​ ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ ​ 59,382 ​ ​ 59,297 ​ Senior notes ​ ​ ​ - ​ ​ 44,585 ​ Notes payable and other borrowings ​ ​ ​ - ​ ​ 9,000 ​ Total borrowings ​ ​ $ 516,625 ​ $ 260,811 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 See Note 10: Junior Subordinated Debentures, below.
Summary of scheduled maturities and weighted average rates of borrowings	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 ​ 2022 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2023 ​ $ - - % $ 131,156 ​ 2.89 % 2024 ​ ​ 431,470 ​ 4.98 ​ ​ - - ​ 2025 ​ - - ​ - - ​ 2026 ​ - - ​ 44,585 ​ 6.02 ​ 2027 ​ - - ​ - - ​ 2028 ​ - - ​ - ​ - ​ Thereafter ​ 85,155 4.10 ​ 85,070 3.91 ​ Total borrowings ​ $ 516,625 4.84 % $ 260,811 3.76 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2023
Income Taxes
Schedule of components of income tax expense (benefit)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Current federal ​ $ 20,724 ​ $ 13,241 ​ $ 750 Current state ​ ​ 10,098 ​ ​ 6,209 ​ ​ 594 Deferred federal ​ ​ 1,964 ​ ​ 3,338 ​ ​ 4,445 Deferred state ​ ​ (107) ​ ​ 1,356 ​ ​ 2,034 Total income tax expense ​ $ 32,679 ​ $ 24,144 ​ $ 7,823 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of components of deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Accrued bonus ​ $ 2,500 ​ $ 2,700 Allowance for credit losses ​ ​ 13,077 ​ ​ 15,591 Deferred compensation ​ ​ 1,622 ​ ​ 1,292 Stock based compensation ​ ​ 1,768 ​ ​ 1,257 Business combination adjustments ​ ​ 270 ​ ​ 1,138 Lease liability ​ ​ 3,201 ​ ​ 682 Other assets ​ ​ 1,602 ​ ​ 939 Total deferred tax assets ​ ​ 24,040 ​ ​ 23,599 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (5,454) ​ ​ (4,107) Goodwill amortization/impairment ​ ​ (465) ​ ​ (229) Mortgage servicing rights ​ ​ (2,842) ​ ​ (3,103) Amortization of core deposit intangible ​ ​ (2,987) ​ ​ (3,673) Right of use asset ​ ​ (1,969) ​ ​ (682) Acquired securities ​ ​ (2,376) ​ ​ (1,921) Other liabilities ​ ​ (1,263) ​ ​ (1,343) Total deferred tax liabilities ​ ​ (17,356) ​ ​ (15,058) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 6,684 ​ ​ 8,541 Tax effect of adjustments related to other comprehensive income ​ ​ 24,393 ​ ​ 36,209 Net deferred tax asset ​ $ 31,077 ​ $ 44,750 ​ ​ ​ ​ ​ ​ ​
Schedule of difference between effective tax rates from federal statutory rates	Effective tax rates differ from federal statutory rates applied to financial statement income (loss) for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Tax at statutory federal income tax rate ​ $ 26,126 ​ $ 19,225 ​ $ 5,852 Nontaxable interest income, net of disallowed interest deduction ​ ​ (947) ​ ​ (1,097) ​ ​ (1,069) BOLI income ​ ​ (445) ​ ​ (151) ​ ​ (292) State income taxes, net of federal benefit ​ ​ 7,911 ​ ​ 6,091 ​ ​ 2,054 Stock based compensation ​ ​ (132) ​ ​ (43) ​ ​ 54 Transaction costs ​ ​ - ​ ​ - ​ ​ 396 Other, net ​ ​ 166 ​ ​ 119 ​ ​ 828 Total tax at effective tax rate ​ $ 32,679 ​ $ 24,144 ​ $ 7,823 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2023
Equity Compensation Plans
Summary of changes in nonvested shares of restricted share rights	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 649,210 ​ $ 12.84 Granted ​ 240,149 ​ ​ 17.02 Vested ​ (150,464) ​ ​ 12.56 Forfeited ​ (29,658) ​ ​ 14.14 Unvested at December 31 ​ 709,237 ​ $ 14.26 ​ ​ ​ ​ ​ ​

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2023
Earnings Per Share
Schedule of Earnings Per Share	The earnings per share, both basic and diluted, are included below as of December 31, (in thousands except for per share data): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,663,722 ​ ​ 44,526,655 ​ ​ 30,208,663 Net income ​ ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Basic earnings per share ​ ​ $ 2.05 ​ $ 1.51 ​ $ 0.66 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,663,722 ​ ​ 44,526,655 ​ ​ 30,208,663 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 731,288 ​ ​ 686,433 ​ ​ 529,199 Diluted average common shares outstanding ​ ​ ​ 45,395,010 ​ ​ 45,213,088 ​ ​ 30,737,862 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Diluted earnings per share ​ ​ $ 2.02 ​ $ 1.49 ​ $ 0.65 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2023
Commitments
Schedule of contractual commitments due to letters of credit	The following table is a summary of financial instrument commitments as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ December 31, 2022 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 173 ​ $ 16,621 ​ $ 16,794 ​ $ 3,514 ​ $ 15,365 ​ $ 18,879 ​ Performance standby ​ ​ 562 ​ ​ 13,689 ​ ​ 14,251 ​ ​ 3,161 ​ ​ 13,989 ​ ​ 17,150 ​ ​ ​ ​ 735 ​ ​ 30,310 ​ ​ 31,045 ​ ​ 6,675 ​ ​ 29,354 ​ ​ 36,029 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 735 ​ $ 30,377 ​ $ 31,112 ​ $ 6,675 ​ $ 29,421 ​ $ 36,096 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 140,305 ​ $ 694,960 ​ $ 835,265 ​ $ 139,070 ​ $ 860,255 ​ $ 999,325 ​
Schedule of aggregate minimum annual rental commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2029 ​ 2024 ​ 2025 ​ 2026 ​ 2027 ​ 2028 ​ and thereafter Rental commitment $ 1,179 ​ $ 1,021 ​ $ 811 ​ $ 770 ​ $ 769 ​ $ 1,023

Regulatory & Capital Matters (T

Regulatory & Capital Matters (Tables)	12 Months Ended
	Dec. 31, 2023
Regulatory & Capital Matters
Schedule of capital levels and industry defined regulatory minimum required levels	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Minimum Capital ​ Well Capitalized ​ ​ ​ ​ ​ ​ ​ ​ ​ Adequacy with Capital ​ Under Prompt Corrective ​ ​ ​ Actual ​ Conservation Buffer, if applicable 1 ​ Action Provisions 2 ​ ​ Amount Ratio Amount Ratio Amount Ratio ​ 2023 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 547,721 ​ 11.37 % ​ $ 337,207 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 12.32 ​ ​ ​ 336,598 ​ 7.00 ​ ​ $ 312,556 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 677,076 ​ 14.06 ​ ​ ​ 505,640 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 636,768 ​ 13.24 ​ ​ ​ 504,990 ​ 10.50 ​ ​ ​ 480,943 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 572,721 ​ 11.89 ​ ​ ​ 409,430 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 12.32 ​ ​ ​ 408,727 ​ 8.50 ​ ​ ​ 384,684 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 572,721 ​ 10.06 ​ ​ ​ 227,722 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 592,413 ​ 10.41 ​ ​ ​ 227,632 ​ 4.00 ​ ​ ​ 284,540 ​ 5.00 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 457,206 ​ 9.67 % ​ $ 330,966 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 11.70 ​ ​ ​ 330,498 ​ 7.00 ​ ​ $ 306,891 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 592,039 ​ 12.52 ​ ​ ​ 496,518 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 602,237 ​ 12.75 ​ ​ ​ 495,960 ​ 10.50 ​ ​ ​ 472,343 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 482,206 ​ 10.20 ​ ​ ​ 401,838 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 11.70 ​ ​ ​ 401,319 ​ 8.50 ​ ​ ​ 377,712 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 482,206 ​ 8.14 ​ ​ ​ 236,956 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 552,404 ​ 9.32 ​ ​ ​ 237,083 ​ 4.00 ​ ​ ​ 296,354 ​ 5.00 ​ ​ 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. 2 The prompt corrective action provisions are only applicable at the Bank level. The Bank exceeded the general minimum regulatory requirements to be considered “well capitalized.” ​

Mortgage Banking Derivatives (T

Mortgage Banking Derivatives (Tables)	12 Months Ended
	Dec. 31, 2023
Not Designated as Hedging Instrument | Mortgage Banking Derivatives.
Mortgage Banking Derivatives
Schedule of the effect of fair value and cash flow hedge accounting	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 6,000 ​ $ 2,750 ​ Fair value ​ (46) ​ 20 ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 1,312 ​ $ 2,548 ​ Fair value ​ 36 ​ 56 ​

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Value Measurements
Schedule of balance of assets and liabilities which are measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 169,574 ​ $ - ​ $ - ​ $ 169,574 U.S. government agencies ​ ​ - ​ ​ 56,959 ​ ​ - ​ ​ 56,959 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 106,370 ​ ​ - ​ ​ 106,370 States and political subdivisions ​ ​ - ​ ​ 214,006 ​ ​ 15,329 ​ ​ 229,335 Collateralized mortgage obligations ​ ​ - ​ ​ 392,544 ​ ​ - ​ ​ 392,544 Asset-backed securities ​ ​ - ​ ​ 66,166 ​ ​ - ​ ​ 66,166 Collateralized loan obligations ​ ​ - ​ ​ 171,881 ​ ​ - ​ ​ 171,881 Loans held-for-sale ​ ​ - ​ ​ 1,322 ​ ​ - ​ ​ 1,322 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 10,344 ​ ​ 10,344 Interest rate swap agreements, including risk participation agreement ​ ​ - ​ ​ 5,391 ​ ​ - ​ ​ 5,391 Mortgage banking derivatives ​ ​ - ​ ​ (10) ​ ​ - ​ ​ (10) Total ​ $ 169,574 ​ $ 1,014,629 ​ $ 25,673 ​ $ 1,209,876 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 8,324 ​ $ - ​ $ 8,324 Total ​ $ - ​ $ 8,324 ​ $ - ​ $ 8,324 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 212,129 ​ $ - ​ $ - ​ $ 212,129 U.S. government agencies ​ ​ - ​ ​ 56,048 ​ ​ - ​ ​ 56,048 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 124,990 ​ ​ - ​ ​ 124,990 States and political subdivisions ​ ​ - ​ ​ 211,899 ​ ​ 14,229 ​ ​ 226,128 Corporate bonds ​ ​ - ​ ​ 9,622 ​ ​ - ​ ​ 9,622 Collateralized mortgage obligations ​ ​ - ​ ​ 526,998 ​ ​ 6,770 ​ ​ 533,768 Asset-backed securities ​ ​ - ​ ​ 186,916 ​ ​ 15,012 ​ ​ 201,928 Collateralized loan obligations ​ ​ - ​ ​ 174,746 ​ ​ - ​ ​ 174,746 Loans held-for-sale ​ ​ - ​ ​ 491 ​ ​ - ​ ​ 491 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 11,189 ​ ​ 11,189 Interest rate swap agreements ​ ​ - ​ ​ 6,516 ​ ​ - ​ ​ 6,516 Mortgage banking derivatives ​ ​ - ​ ​ 76 ​ ​ - ​ ​ 76 Total ​ $ 212,129 ​ $ 1,298,302 ​ $ 47,200 ​ $ 1,557,631 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 12,265 ​ $ - ​ $ 12,265 Total ​ $ - ​ $ 12,265 ​ $ - ​ $ 12,265
Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2023 ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ Asset-backed Mortgage Political ​ Servicing ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2023 ​ $ 15,012 $ 6,770 $ 14,229 ​ $ 11,189 Transfers out of Level 3 ​ ​ (14,885) ​ (6,764) ​ - ​ ​ - Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ (11) ​ - ​ (134) ​ ​ (924) Included in other comprehensive income ​ ​ 226 ​ (6) ​ 1,010 ​ ​ - Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 782 ​ ​ - Issuances ​ ​ - ​ - ​ - ​ ​ 580 Settlements ​ ​ (342) ​ - ​ (558) ​ ​ (501) Ending balance December 31, 2023 ​ $ - $ - $ 15,329 ​ $ 10,344 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2022 ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ ​ Asset-backed Mortgage Political ​ Servicing ​ ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2022 ​ $ - $ - $ 15,236 ​ $ 7,097 ​ Transfers into Level 3 ​ ​ 15,012 ​ 6,770 ​ - ​ ​ - ​ Transfers out of Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ - ​ - ​ (136) ​ ​ 4,106 ​ Included in other comprehensive income ​ ​ - ​ - ​ (86) ​ ​ - ​ Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 519 ​ ​ - ​ Issuances ​ ​ - ​ - ​ - ​ ​ 915 ​ Settlements ​ ​ - ​ - ​ (1,304) ​ ​ (929) ​ Ending balance December 31, 2022 ​ $ 15,012 $ 6,770 $ 14,229 ​ $ 11,189 ​
Schedule of quantitative information about level 3 fair value measurements	The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2023: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ States and political subdivisions ​ $ 15,329 ​ Discounted Cash Flow ​ Discount Rate ​ 3.2 – 5.6% ​ 4.8 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.0 – 0.5% ​ 0.4 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 10,344 ​ Discounted Cash Flow ​ Discount Rate ​ 9.0 – 11.0% ​ 9.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 5.1 – 33.0% ​ 6.6 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted Measured at fair value ​ ​ ​ ​ ​ ​ Significant Unobservable ​ ​ ​ Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ States and political subdivisions ​ $ 14,229 ​ Discounted Cash Flow ​ Discount Rate ​ 2.3 – 5.8% ​ 4.4 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.3 – 0.5% ​ 0.5 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Collateralized mortgage obligations ​ $ 6,770 ​ Discounted Cash Flow ​ Discount Rate ​ 7.0 – 7.0% ​ 7.0 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Asset-backed securities ​ $ 15,012 ​ Discounted Cash Flow ​ Discount Rate ​ 6.2 – 6.5% ​ 6.3 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 11,189 ​ Discounted Cash Flow ​ Discount Rate ​ 9.0 – 11.0% ​ 9.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 3.6 – 27.3% ​ 6.2 %
Schedule of assets measured at fair value on a nonrecurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 66,180 ​ $ 66,180 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 5,123 ​ ​ 5,123 Total ​ $ - ​ $ - ​ $ 71,303 ​ $ 71,303 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans and to a lesser extent the discounted cash flow, had a carrying amount of $77.3 million and a valuation allowance of $11.1 million, resulting in a decrease of specific allocations within the provision for credit losses of $6.5 million for the year ending December 31, 2023. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $5.1 million, which is made up of the outstanding balance of $5.2 million, net of a valuation allowance of $ 118,000 at December 31, 2023. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 47,700 ​ $ 47,700 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 1,561 ​ ​ 1,561 Total ​ $ - ​ $ - ​ $ 49,261 ​ $ 49,261 ​ 1 Represents carrying value and related write-downs of loans for which adjustments are substantially based on the appraised value of collateral for collateral-dependent loans and to a lesser extent the discounted cash flow, had a carrying amount of $65.3 million and a valuation allowance of $17.6 million, resulting in an increase of specific allocations within the provision for credit losses of $12.2 million for the year ending December 31, 2022. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $1.6 million, which is made up of the outstanding balance of $2.5 million, net of a valuation allowance of $856,000 and purchase accounting adjustments of $131,000 at December 31, 2022.

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2023
Fair Values of Financial Instruments
Schedule of carrying amount and estimated fair values of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 55,534 ​ $ 55,534 ​ $ 55,534 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 44,611 ​ ​ 44,611 ​ ​ 44,611 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,192,829 ​ ​ 1,192,829 ​ ​ 169,574 ​ ​ 1,007,926 ​ ​ 15,329 FHLBC and FRBC stock ​ ​ 33,355 ​ ​ 33,355 ​ ​ - ​ ​ 33,355 ​ ​ - Loans held-for-sale ​ ​ 1,322 ​ ​ 1,322 ​ ​ - ​ ​ 1,322 ​ ​ - Net loans ​ ​ 3,998,689 ​ ​ 3,876,381 ​ ​ - ​ ​ - ​ ​ 3,876,381 Mortgage servicing rights ​ ​ 10,344 ​ ​ 10,344 ​ ​ - ​ ​ - ​ ​ 10,344 Interest rate swap agreements ​ ​ 5,302 ​ ​ 5,302 ​ ​ - ​ ​ 5,302 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ (10) ​ ​ (10) ​ ​ - ​ ​ (10) ​ ​ - Interest receivable on securities and loans ​ ​ 27,159 ​ ​ 27,159 ​ ​ - ​ ​ 27,159 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 1,834,891 ​ $ 1,834,891 ​ $ 1,834,891 ​ $ - ​ $ - Interest bearing deposits ​ ​ 2,735,855 ​ ​ 2,726,223 ​ ​ - ​ ​ 2,726,223 ​ ​ - Securities sold under repurchase agreements ​ ​ 26,470 ​ ​ 26,470 ​ ​ - ​ ​ 26,470 ​ ​ - Other short-term borrowings ​ ​ 405,000 ​ ​ 405,000 ​ ​ - ​ ​ 405,000 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 20,361 ​ ​ - ​ ​ 20,361 ​ ​ - Subordinated debentures ​ ​ 59,382 ​ ​ 47,982 ​ ​ - ​ ​ 47,982 ​ ​ - Interest rate swap agreements ​ ​ 8,324 ​ ​ 8,324 ​ ​ - ​ ​ 8,324 ​ ​ - Interest payable on deposits and borrowings ​ ​ 2,962 ​ ​ 2,962 ​ ​ - ​ ​ 2,962 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 56,632 ​ $ 56,632 ​ $ 56,632 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 58,545 ​ ​ 58,545 ​ ​ 58,545 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,539,359 ​ ​ 1,539,359 ​ ​ 212,129 ​ ​ 1,291,219 ​ ​ 36,011 FHLBC and FRBC stock ​ ​ 20,530 ​ ​ 20,530 ​ ​ - ​ ​ 20,530 ​ ​ - Loans held-for-sale ​ ​ 491 ​ ​ 491 ​ ​ - ​ ​ 491 ​ ​ - Net loans ​ ​ 3,820,129 ​ ​ 3,681,387 ​ ​ - ​ ​ - ​ ​ 3,681,387 Mortgage servicing rights ​ ​ 11,189 ​ ​ 11,189 ​ ​ - ​ ​ - ​ ​ 11,189 Interest rate swap agreements ​ ​ 6,391 ​ ​ 6,391 ​ ​ - ​ ​ 6,391 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 76 ​ ​ 76 ​ ​ - ​ ​ 76 ​ ​ - Interest receivable on securities and loans ​ ​ 22,661 ​ ​ 22,661 ​ ​ - ​ ​ 22,661 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 2,051,702 ​ $ 2,051,702 ​ $ 2,051,702 ​ $ - ​ $ - Interest bearing deposits ​ ​ 3,059,021 ​ ​ 3,042,740 ​ ​ - ​ ​ 3,042,740 ​ ​ - Securities sold under repurchase agreements ​ ​ 32,156 ​ ​ 32,156 ​ ​ - ​ ​ 32,156 ​ ​ - Other short-term borrowings ​ ​ 90,000 ​ ​ 90,000 ​ ​ - ​ ​ 90,000 ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 21,907 ​ ​ - ​ ​ 21,907 ​ ​ - Subordinated debentures ​ ​ 59,297 ​ ​ 52,322 ​ ​ - ​ ​ 52,322 ​ ​ - Senior notes ​ ​ 44,585 ​ ​ 44,248 ​ ​ 44,248 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 9,000 ​ ​ 8,984 ​ ​ - ​ ​ 8,984 ​ ​ - Interest rate swap agreements ​ ​ 12,264 ​ ​ 12,264 ​ ​ - ​ ​ 12,264 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,657 ​ ​ 1,657 ​ ​ - ​ ​ 1,657 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Tables)	12 Months Ended
	Dec. 31, 2023
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Schedule of fair value of derivative financial instruments as well as their classification on the Balance Sheet	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2023 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 5 ​ 325,774 ​ Other Assets 2,576 ​ Other Liabilities 5,598 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,576 ​ ​ 5,598 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 17 ​ 104,777 ​ Other Assets 2,726 ​ Other Liabilities 2,726 Interest rate lock commitments and forward contracts 24 ​ 8,375 ​ Other Assets (10) ​ Other Liabilities - Other contracts 4 ​ 44,790 ​ Other Assets 89 ​ Other Liabilities - Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 2,805 ​ ​ 2,726 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 4 ​ 275,774 ​ Other Assets 2,737 ​ Other Liabilities 8,610 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 2,737 ​ ​ 8,610 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 21 ​ 110,647 ​ Other Assets 3,654 ​ Other Liabilities 3,654 Interest rate lock commitments and forward contracts 28 ​ 5,298 ​ Other Assets 76 ​ Other Liabilities - Other contracts 4 ​ 43,699 ​ Other Assets 125 ​ Other Liabilities 1 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,855 ​ ​ 3,655

Parent Company Condensed Fina_2

Parent Company Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2023
Parent Company Condensed Financial Information
Schedule of condensed balance sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 36,686 ​ $ 39,167 ​ Investment in subsidiaries ​ 620,663 ​ 555,140 ​ Other assets ​ 6,183 ​ 6,526 ​ Total assets ​ $ 663,532 ​ $ 600,833 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,382 ​ 59,297 ​ Senior notes ​ ​ - ​ ​ 44,585 ​ Notes payable ​ ​ - ​ ​ 9,000 ​ Other liabilities ​ 1,096 ​ 1,037 ​ Stockholders’ equity ​ 577,281 ​ 461,141 ​ Total liabilities and stockholders' equity ​ $ 663,532 ​ $ 600,833 ​
Schedule of condensed statements of operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 65,000 ​ $ 40,000 ​ $ 40,000 Other income ​ 67 ​ 29 ​ 15 Total operating income ​ 65,067 ​ 40,029 ​ 40,015 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,095 ​ 1,136 ​ 1,133 Subordinated debt ​ ​ 2,185 ​ ​ 2,185 ​ ​ 1,610 Senior notes ​ ​ 2,408 ​ ​ 2,682 ​ ​ 2,692 Notes payable ​ 87 ​ 385 ​ 291 Other expenses ​ 5,947 ​ 5,086 ​ 6,918 Total operating expense ​ 11,722 ​ 11,474 ​ 12,644 Income before income taxes and equity in undistributed net income of subsidiaries ​ 53,345 ​ 28,555 ​ 27,371 Income tax benefit ​ (3,309) ​ (3,216) ​ (2,986) Income before equity in undistributed net income of subsidiaries ​ 56,654 ​ 31,771 ​ 30,357 Equity in undistributed net income of subsidiaries ​ 35,075 ​ 35,634 ​ (10,313) Net income available to common stockholders ​ $ 91,729 ​ $ 67,405 ​ $ 20,044
Schedule of condensed statements of cash Flows	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2023 2022 2021 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 91,729 ​ $ 67,405 ​ $ 20,044 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ (35,075) ​ (35,634) ​ 10,313 Provision for deferred tax (benefit) expense ​ (513) ​ 91 ​ (248) Change in taxes payable ​ 794 ​ (4,694) ​ (695) Change in other assets ​ (43) ​ 12 ​ (12) Stock-based compensation ​ 3,603 ​ 2,960 ​ 1,435 Other, net ​ 575 ​ (2,753) ​ 961 Net cash provided by operating activities ​ 61,070 ​ 27,387 ​ 31,798 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Investing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash paid for acquisition, net of cash and cash equivalents retained ​ - ​ - ​ (94,406) Net cash used in investing activities ​ - ​ - ​ (94,406) ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash Flows from Financing Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Dividend paid on common stock ​ ​ (8,946) ​ ​ (8,877) ​ ​ (4,612) Purchases of treasury stock ​ (605) ​ (455) ​ (10,417) Issuance of sub debt ​ ​ - ​ ​ - ​ ​ 59,148 Repayment of term note ​ ​ (9,000) ​ ​ (4,000) ​ ​ (4,000) Repayment of senior note ​ ​ (45,000) ​ ​ - ​ ​ - Net cash (used in) provided by financing activities ​ (63,551) ​ (13,332) ​ 40,119 Net change in cash and cash equivalents ​ (2,481) ​ 14,055 ​ (22,489) Cash and cash equivalents at beginning of year ​ 39,167 ​ 25,112 ​ 47,601 Cash and cash equivalents at end of year ​ $ 36,686 ​ $ 39,167 ​ $ 25,112 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) segment item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 16, 2024 $ / shares
Number of banking centres | item	48
Operating segment | segment	1
Reportable Segment | segment	1
Deferred tax assets	$ 24,040,000	$ 23,599,000
Period from due date after which accrual of interest income is discontinued	90 days
Goodwill and Core Deposit Intangible
Amortization of core deposit intangibles	$ 2,461,000	2,626,000	$ 644,000
90-Days or Greater Past Due Loans
Percentage of forfeiture assumption for group grant	5%
Core Deposits
Goodwill and Core Deposit Intangible
Carrying value of the intangible asset	$ 11,200,000	13,700,000
Amortization of core deposit intangibles	2,500,000	$ 2,600,000	$ 644,000
Expected future annual amortization expense:
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2024	2,300,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2025	2,100,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2026	1,800,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2027	1,600,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2028	$ 1,300,000
GCFC/ABC Bank | Core Deposits
Goodwill and Core Deposit Intangible
Useful life (in years)	10 years
Subsequent Event
90-Days or Greater Past Due Loans
Cash dividend declared (per share) | $ / shares				$ 0.05

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Transfers and Servicing of Financial Assets
Mortgage loans serviced for others	$ 737.2	$ 771.4
Other Assets
Premises and equipment
Fixed Assets Held for Sale	$ 1	$ 4.6
Buildings | Minimum
Premises and equipment
Useful lives	25 years
Buildings | Maximum
Premises and equipment
Useful lives	40 years
Building Improvements | Minimum
Premises and equipment
Useful lives	3 years
Building Improvements | Maximum
Premises and equipment
Useful lives	15 years
Furniture and equipment | Minimum
Premises and equipment
Useful lives	3 years
Furniture and equipment | Maximum
Premises and equipment
Useful lives	10 years

Acquisition (Details)

Acquisition (Details) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 01, 2021	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
Liabilities
Goodwill			$ 86,478,000		$ 86,478,000
West Suburban acquired loans
Assets
Cash and due from banks	$ 16,794,000
Interest bearing deposits with financial institutions	232,880,000
Securities available-for-sale and held-to maturity, at fair value	1,067,517,000
FHLBC stock	3,340,000
Loans, net of allowance for credit losses Day One PCD loan adjustment	1,500,974,000
Premises and equipment	47,456,000
Other real estate owned	5,552,000
Core deposit intangible	14,772,000
Deferred tax assets	5,819,000
Other assets	48,838,000
Total assets	2,943,942,000
Liabilities
Noninterest bearing demand	1,070,980,000
Savings, NOW and money market	1,408,051,000
Time	215,205,000
Total deposits	2,694,236,000
Reserve for unfunded commitments	1,787,000
Other liabilities	20,629,000
Total liabilities	2,716,652,000
Cash consideration paid	100,679,000
Stock issued for acquisition	194,484,000
Total Liabilities Assumed and Cash Consideration Paid for Acquisition	3,011,815,000
Goodwill	$ 67,873,000	$ 67,700,000
Shares issued or issuable	42.413
Cash consideration for each share	$ 271.15
Merger consideration	$ 295,200,000
Common stock shares issued	15,700,000
Measurement period	1 year
Increase decrease in deferred tax assets		3,700,000
Decrease in current taxes receivable		3,900,000
Increase to goodwill		$ 146,000
Expenses related to acquisition			$ 9,100,000	$ 13,200,000
Acquisition expenses				$ 25,100,000

Acquisition - Purchase Price of

Acquisition - Purchase Price of PCD Loans (Details) - West Suburban acquired loans $ in Thousands	Dec. 01, 2021 USD ($)
Business Acquisition [Line Items]
Purchase price of PCD loans at acquisition	$ 1,500,974
PCD
Business Acquisition [Line Items]
Par value of acquired loans	108,241
Allowance for credit losses	(12,075)
Non-credit discount	(1,723)
Purchase price of PCD loans at acquisition	$ 94,443

Acquisition - Carrying Value of

Acquisition - Carrying Value of Acquired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Business Acquisition [Line Items]
Book value of loans acquired	$ 911,552	$ 1,184,133
Accretion recorded on acquired loans year to date	2,352	5,574
Accretion recorded on acquired unfunded commitments year to date	819	893
West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	876,201	1,134,759
ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	23,158	33,681
Talmer Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	12,193	15,693
PCD
Business Acquisition [Line Items]
Book value of loans acquired	55,725	77,182
Accretion recorded on acquired loans year to date	668	848
PCD | West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	54,123	75,396
PCD | ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	1,602	1,786
Non-PCD
Business Acquisition [Line Items]
Book value of loans acquired	855,827	1,106,951
Accretion recorded on acquired loans year to date	1,684	4,726
Non-PCD | West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	822,078	1,059,363
Non-PCD | ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	21,556	31,895
Non-PCD | Talmer Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	$ 12,193	$ 15,693

Acquisition - Unaudited Pro For

Acquisition - Unaudited Pro Forma (Details) - West Suburban acquired loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Net interest income	$ 166,495	$ 165,283
Noninterest income	59,036	48,937
Net income attributable to Old Second Bancorp, Inc.	$ 67,779	$ 12,349

Cash and Due from Banks (Detail

Cash and Due from Banks (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Cash and Due from Banks.
Cash and cash equivalents	$ 100,145	$ 115,177

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)
Securities Available-for-Sale
Amortized Cost	$ 1,276,981	$ 1,662,819
Gross Unrealized Gains	1,818	370
Gross Unrealized Losses	(85,970)	(123,830)
Securities available-for-sale	1,192,829	1,539,359
Accrued interest receivable	6,600	6,800
FHLB and FRB Stock
FHLBC stock	18,500	5,600
FRBC stock	14,900	14,900
Securities pledged to secure deposits and for other purposes	810,200	547,800
Other disclosures
Securities available-for-sale	$ 1,192,829	1,539,359
Number of securities issued from originators	0
Number of originators | item	1
Minimum percentage of securities investment	10%
US government and agencies debt securities, percentage of guarantee	100%
US government and agencies debt securities, threshold percentage of guarantee for allowance of credit loss	100%
U.S. Treasury
Securities Available-for-Sale
Amortized Cost	$ 174,602	224,054
Gross Unrealized Losses	(5,028)	(11,925)
Securities available-for-sale	169,574	212,129
Other disclosures
Securities available-for-sale	169,574	212,129
U.S. government agencies
Securities Available-for-Sale
Amortized Cost	60,011	61,178
Gross Unrealized Losses	(3,052)	(5,130)
Securities available-for-sale	56,959	56,048
Other disclosures
Securities available-for-sale	56,959	56,048
U.S. government agencies mortgage-backed
Securities Available-for-Sale
Amortized Cost	118,492	140,588
Gross Unrealized Losses	(12,122)	(15,598)
Securities available-for-sale	106,370	124,990
Other disclosures
Securities available-for-sale	106,370	124,990
States and political subdivisions
Securities Available-for-Sale
Amortized Cost	238,440	239,999
Gross Unrealized Gains	1,325	363
Gross Unrealized Losses	(10,430)	(14,234)
Securities available-for-sale	229,335	226,128
Other disclosures
Securities available-for-sale	229,335	226,128
Corporate bonds
Securities Available-for-Sale
Amortized Cost		10,000
Gross Unrealized Losses		(378)
Securities available-for-sale		9,622
Other disclosures
Securities available-for-sale		9,622
Collateralized mortgage obligations
Securities Available-for-Sale
Amortized Cost	442,987	596,336
Gross Unrealized Gains	421	1
Gross Unrealized Losses	(50,864)	(62,569)
Securities available-for-sale	392,544	533,768
Other disclosures
Securities available-for-sale	392,544	533,768
Asset-backed Securities
Securities Available-for-Sale
Amortized Cost	69,248	210,388
Gross Unrealized Gains	42	6
Gross Unrealized Losses	(3,124)	(8,466)
Securities available-for-sale	66,166	201,928
Other disclosures
Securities available-for-sale	66,166	201,928
Collateralized loan obligations.
Securities Available-for-Sale
Amortized Cost	173,201	180,276
Gross Unrealized Gains	30
Gross Unrealized Losses	(1,350)	(5,530)
Securities available-for-sale	171,881	174,746
Other disclosures
Securities available-for-sale	$ 171,881	$ 174,746
Minimum
Other disclosures
Debt securities, available-for-sale, allowance for credit loss, percent of market value loss	5%
Debt securities, available-for-sale, allowance for credit loss, market value loss	$ 200,000

Securities - Contractual Maturi

Securities - Contractual Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 150,067
Due after one year through five years	99,527
Due after five years through ten years	59,571
Due after ten years	163,888
Debt securities excluding securities not due at a single maturity date	473,053
Total	$ 1,276,981	$ 1,662,819
Securities Available-for-Sale, Weighted Average Yield
Due in one year or less (as a percent)	1.06%
Due after one year through five years (as a percent)	1.36%
Due after five years through ten years (as a percent)	2.92%
Due after ten years (as a percent)	3.11%
Debt securities (as a percent)	2.07%
Total (as a percent)	3.03%
Securities Available-for-Sale, Fair Value
Due in one year or less	$ 146,728
Due after one year through five years	94,572
Due after five years through ten years	55,005
Due after ten years	159,563
Debt securities	455,868
Debt Securities, Available-for-sale, Total	1,192,829	1,539,359
Mortgage-backed and collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	$ 561,479
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.42%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 498,914
Asset-backed Securities
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	69,248
Total	$ 69,248	210,388
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	4.35%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 66,166
Debt Securities, Available-for-sale, Total	66,166	201,928
Collateralized loan obligations.
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	173,201
Total	$ 173,201	180,276
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	7.14%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 171,881
Debt Securities, Available-for-sale, Total	$ 171,881	$ 174,746

Securities - Unrealized Loss Po

Securities - Unrealized Loss Positions (Details) $ in Thousands	Dec. 31, 2023 USD ($) security	Dec. 31, 2022 USD ($) security
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	14	194
Greater than 12 months in an unrealized loss position | security	353	299
Total | security	367	493
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 145	$ 27,304
Greater than 12 months in an unrealized loss position	85,825	96,526
Total	85,970	123,830
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	28,708	579,571
Greater than 12 months in an unrealized loss position	1,030,120	906,689
Total	$ 1,058,828	$ 1,486,260
U.S. Treasury
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		1
Greater than 12 months in an unrealized loss position | security	4	4
Total | security	4	5
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 1,025
Greater than 12 months in an unrealized loss position	$ 5,028	10,900
Total	5,028	11,925
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		24,121
Greater than 12 months in an unrealized loss position	169,574	188,008
Total	$ 169,574	$ 212,129
U.S. government agencies
Securities Available-for-Sale, Number of Securities
Greater than 12 months in an unrealized loss position | security	9	9
Total | security	9	9
Securities Available-for-Sale, Unrealized Losses
Greater than 12 months in an unrealized loss position	$ 3,052	$ 5,130
Total	3,052	5,130
Securities Available-for-Sale, Fair Value
Greater than 12 months in an unrealized loss position	56,959	56,048
Total	$ 56,959	$ 56,048
Mortgage Backed Securities, Issued by US Government Agencies
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		15
Greater than 12 months in an unrealized loss position | security	128	117
Total | security	128	132
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 975
Greater than 12 months in an unrealized loss position	$ 12,122	14,623
Total	12,122	15,598
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		11,369
Greater than 12 months in an unrealized loss position	106,370	113,621
Total	$ 106,370	$ 124,990
States and political subdivisions
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	12	45
Greater than 12 months in an unrealized loss position | security	27	15
Total | security	39	60
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 137	$ 5,800
Greater than 12 months in an unrealized loss position	10,293	8,434
Total	10,430	14,234
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	27,974	128,770
Greater than 12 months in an unrealized loss position	108,408	48,877
Total	$ 136,382	$ 177,647
Corporate bonds
Securities Available-for-Sale, Number of Securities
Greater than 12 months in an unrealized loss position | security		2
Total | security		2
Securities Available-for-Sale, Unrealized Losses
Greater than 12 months in an unrealized loss position		$ 378
Total		378
Securities Available-for-Sale, Fair Value
Greater than 12 months in an unrealized loss position		9,622
Total		$ 9,622
Collateralized mortgage obligations
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	2	80
Greater than 12 months in an unrealized loss position | security	143	120
Total | security	145	200
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 8	$ 12,895
Greater than 12 months in an unrealized loss position	50,856	49,674
Total	50,864	62,569
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	734	180,624
Greater than 12 months in an unrealized loss position	376,236	348,880
Total	$ 376,970	$ 529,504
Asset-backed Securities
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		30
Greater than 12 months in an unrealized loss position | security	17	21
Total | security	17	51
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 3,030
Greater than 12 months in an unrealized loss position	$ 3,124	5,436
Total	3,124	8,466
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		121,915
Greater than 12 months in an unrealized loss position	61,671	79,659
Total	$ 61,671	$ 201,574
Collateralized loan obligations.
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		23
Greater than 12 months in an unrealized loss position | security	25	11
Total | security	25	34
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 3,579
Greater than 12 months in an unrealized loss position	$ 1,350	1,951
Total	1,350	5,530
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		112,772
Greater than 12 months in an unrealized loss position	150,902	61,974
Total	$ 150,902	$ 174,746

Securities - Realized Gain (Los

Securities - Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securities
Proceeds from sales of securities	$ 205,738	$ 30,981	$ 605,846
Gross realized gains on securities			270
Gross realized losses on securities	(4,148)	(944)	(38)
Net realized losses	(4,148)	(944)	232
Income tax benefit on net realized losses	$ 1,117	$ 265	$ (65)
Effective tax rate applied (as a percent)	26.90%	28.10%	28%

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loans
Total Loans	$ 4,042,953	$ 3,869,609
Allowance for credit losses	(44,264)	(49,480)	$ (44,281)	$ (33,855)
Net loans	3,998,689	3,820,129
PCD
Loans
Allowance for credit losses			(12,075)
Commercial
Loans
Total Loans	841,697	840,964
Allowance for credit losses	(3,998)	(11,968)	(11,751)	(2,812)
Commercial | PCD
Loans
Allowance for credit losses			(7,161)
Leases
Loans
Total Loans	398,223	277,385
Allowance for credit losses	(2,952)	(2,865)	(3,480)	(3,888)
Commercial real estate - Investor
Loans
Total Loans	1,034,424	987,635
Allowance for credit losses	(17,105)	(10,674)	(10,795)	(7,899)
Commercial real estate - Investor | PCD
Loans
Allowance for credit losses			(1,877)
Commercial real estate - Owner occupied
Loans
Total Loans	796,538	854,879
Allowance for credit losses	(12,280)	(15,001)	(4,913)	(3,557)
Commercial real estate - Owner occupied | PCD
Loans
Allowance for credit losses			(2,771)
Construction
Loans
Total Loans	165,380	180,535
Residential real estate - Investor
Loans
Total Loans	52,595	57,353
Allowance for credit losses	(669)	(768)	(760)	(1,740)
Residential real estate - Investor | PCD
Loans
Allowance for credit losses			(23)
Residential real estate - Owner occupied
Loans
Total Loans	226,248	219,718
Allowance for credit losses	(1,821)	(2,046)	(2,832)	(2,714)
Residential real estate - Owner occupied | PCD
Loans
Allowance for credit losses			(136)
Multifamily
Loans
Total Loans	401,696	323,691
Allowance for credit losses	(2,728)	(2,453)	(3,675)	(3,625)
HELOC
Loans
Total Loans	103,237	109,202
Allowance for credit losses	(1,656)	(1,806)	(2,510)	$ (1,948)
HELOC | PCD
Loans
Allowance for credit losses			$ (5)
Others
Loans
Total Loans	$ 22,915	$ 18,247

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Major Classifications - Loan Concentrations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans
Loans and leases receivable, accrued interest receivable	$ 20.5	$ 15.9
Real estate | Loan receivables | Customer Concentration Risk
Loans
Loans receivable as a percentage of total portfolio	68.80%	70.60%

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	$ 49,480	$ 44,281	$ 33,855
(Release of) Provision for Credit Losses	18,086	6,750	2,795
Charge-offs	24,642	2,460	5,933
Recoveries	1,340	909	1,489
Financing Receivable, Allowance for Credit Loss, Ending Balance	44,264	49,480	44,281
PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		12,075
Financing Receivable, Allowance for Credit Loss, Ending Balance			12,075
Commercial
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	11,968	11,751	2,812
(Release of) Provision for Credit Losses	(7,717)	273	2,389
Charge-offs	885	151	963
Recoveries	632	95	352
Financing Receivable, Allowance for Credit Loss, Ending Balance	3,998	11,968	11,751
Commercial | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		7,161
Financing Receivable, Allowance for Credit Loss, Ending Balance			7,161
Leases
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	2,865	3,480	3,888
(Release of) Provision for Credit Losses	850	(246)	(339)
Charge-offs	882	371	69
Recoveries	119	2
Financing Receivable, Allowance for Credit Loss, Ending Balance	2,952	2,865	3,480
Commercial real estate - Investor
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	10,674	10,795	7,899
(Release of) Provision for Credit Losses	18,170	1,199	3,665
Charge-offs	11,816	1,401	2,724
Recoveries	77	81	78
Financing Receivable, Allowance for Credit Loss, Ending Balance	17,105	10,674	10,795
Commercial real estate - Investor | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		1,877
Financing Receivable, Allowance for Credit Loss, Ending Balance			1,877
Commercial real estate - Owner occupied
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	15,001	4,913	3,557
(Release of) Provision for Credit Losses	7,941	10,117	147
Charge-offs	10,691	133	1,797
Recoveries	29	104	235
Financing Receivable, Allowance for Credit Loss, Ending Balance	12,280	15,001	4,913
Commercial real estate - Owner occupied | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		2,771
Financing Receivable, Allowance for Credit Loss, Ending Balance			2,771
Real estate - construction
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	1,546	3,373	4,054
(Release of) Provision for Credit Losses	(608)	(1,827)	(783)
Recoveries	100
Financing Receivable, Allowance for Credit Loss, Ending Balance	1,038	1,546	3,373
Real estate - construction | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		102
Financing Receivable, Allowance for Credit Loss, Ending Balance			102
Residential real estate - Investor
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	768	760	1,740
(Release of) Provision for Credit Losses	(129)	(22)	(1,294)
Recoveries	30	30	291
Financing Receivable, Allowance for Credit Loss, Ending Balance	669	768	760
Residential real estate - Investor | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		23
Financing Receivable, Allowance for Credit Loss, Ending Balance			23
Residential real estate - Owner occupied
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	2,046	2,832	2,714
(Release of) Provision for Credit Losses	(304)	(1,010)	(176)
Charge-offs		2
Recoveries	79	226	158
Financing Receivable, Allowance for Credit Loss, Ending Balance	1,821	2,046	2,832
Residential real estate - Owner occupied | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		136
Financing Receivable, Allowance for Credit Loss, Ending Balance			136
Multifamily
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	2,453	3,675	3,625
(Release of) Provision for Credit Losses	275	(1,285)	233
Charge-offs			183
Recoveries		63
Financing Receivable, Allowance for Credit Loss, Ending Balance	2,728	2,453	3,675
HELOC
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	1,806	2,510	1,948
(Release of) Provision for Credit Losses	(255)	(844)	340
Charge-offs			17
Recoveries	105	140	234
Financing Receivable, Allowance for Credit Loss, Ending Balance	1,656	1,806	2,510
HELOC | PCD
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance		5
Financing Receivable, Allowance for Credit Loss, Ending Balance			5
Other
Allowance for loan losses:
Financing Receivable, Allowance for Credit Loss, Beginning Balance	353	192	1,618
(Release of) Provision for Credit Losses	(137)	395	(1,387)
Charge-offs	368	402	180
Recoveries	169	168	141
Financing Receivable, Allowance for Credit Loss, Ending Balance	$ 17	$ 353	$ 192

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	$ 3,998,689	$ 3,820,129
ACL Allocation	44,264	49,480	$ 44,281	$ 33,855
Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	63,115	50,478
Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	61,997	40,641
Accounts Receivable | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	797	5,915
Equipment | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	321	1,248
Other. | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI		2,674
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	7,878	10,744
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	3,998	11,968	11,751	2,812
Commercial | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	1,634	7,162
Commercial | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	837	883
Commercial | Accounts Receivable | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	797	5,915
Commercial | Other. | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI		364
Commercial | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2	569
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,952	2,865	3,480	3,888
Leases | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	321	1,248
Leases | Equipment | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	321	1,248
Leases | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	320	1,248
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	17,105	10,674	10,795	7,899
Commercial real estate - Investor | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	15,735	16,576
Commercial real estate - Investor | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	15,735	16,576
Commercial real estate - Investor | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	3,656	2,875
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	12,280	15,001	4,913	3,557
Commercial real estate - Owner occupied | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	34,894	21,498
Commercial real estate - Owner occupied | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	34,894	19,188
Commercial real estate - Owner occupied | Other. | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI		2,310
Commercial real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	3,900	5,808
Construction | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	7,162
Construction | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	7,162
Residential real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	669	768	760	1,740
Residential real estate - Investor | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	422	675
Residential real estate - Investor | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	422	675
Residential real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	1,821	2,046	2,832	2,714
Residential real estate - Owner occupied | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	1,506	1,817
Residential real estate - Owner occupied | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	1,506	1,817
Residential real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		244
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,728	2,453	3,675	3,625
Multifamily | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	1,402	1,322
Multifamily | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	1,402	1,322
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	1,656	1,806	2,510	1,948
HELOC | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	39	180
HELOC | Real Estate | Asset Pledged as Collateral without Right
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans, including deferred loan loan costs and PCI	39	180
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	$ 17	$ 353	$ 192	$ 1,618

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Aging Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Aged analysis of past due loans
Total Loans	$ 4,042,953	$ 3,869,609
Recorded Investment 90 days or Greater Past Due and Accruing	1,196	1,262
Special Mention [Member]
Aged analysis of past due loans
Total Loans	70,577	179,029
Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	49,392	22,214
30 to 59 Days Past Due
Aged analysis of past due loans
Current	10,176	6,326
60 to 89 Days Past Due
Aged analysis of past due loans
Current	6,134	2,874
90 Days or Greater Past Due
Aged analysis of past due loans
Current	33,082	13,014
Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	3,993,561	3,847,395
Commercial
Aged analysis of past due loans
Total Loans	841,697	840,964
Recorded Investment 90 days or Greater Past Due and Accruing	1,155	460
Commercial | Special Mention [Member]
Aged analysis of past due loans
Total Loans	8,007	27,047
Commercial | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	2,210	1,840
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	982	3
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		1,012
Commercial | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,228	825
Commercial | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	839,487	839,124
Leases
Aged analysis of past due loans
Total Loans	398,223	277,385
Leases | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	946	1,083
Leases | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	599	447
Leases | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		22
Leases | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	347	614
Leases | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	397,277	276,302
Commercial real estate - Investor
Aged analysis of past due loans
Total Loans	1,034,424	987,635
Commercial real estate - Investor | Special Mention [Member]
Aged analysis of past due loans
Total Loans	11,267	32,655
Commercial real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	7,296	8,867
Commercial real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	1,209	3,276
Commercial real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		1,276
Commercial real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	6,087	4,315
Commercial real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	1,027,128	978,768
Commercial real estate - Owner occupied
Aged analysis of past due loans
Total Loans	796,538	854,879
Recorded Investment 90 days or Greater Past Due and Accruing		173
Commercial real estate - Owner occupied | Special Mention [Member]
Aged analysis of past due loans
Total Loans	35,677	97,763
Commercial real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	21,474	2,697
Commercial real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	2,103	373
Commercial real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	3,726	113
Commercial real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	15,645	2,211
Commercial real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	775,064	852,182
Real estate - construction
Aged analysis of past due loans
Total Loans	165,380	180,535
Real estate - construction | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	10,008	130
Real estate - construction | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	2,540	14
Real estate - construction | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	307
Real estate - construction | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	7,161	116
Real estate - construction | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	155,372	180,405
Residential real estate - Investor
Aged analysis of past due loans
Total Loans	52,595	57,353
Recorded Investment 90 days or Greater Past Due and Accruing		144
Residential real estate - Investor | Special Mention [Member]
Aged analysis of past due loans
Total Loans	66	70
Residential real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,287	1,432
Residential real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	540	445
Residential real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	579
Residential real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	168	987
Residential real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	51,308	55,921
Residential real estate - Owner occupied
Aged analysis of past due loans
Total Loans	226,248	219,718
Recorded Investment 90 days or Greater Past Due and Accruing		485
Residential real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	2,622	3,423
Residential real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	553	1,191
Residential real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	125
Residential real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,944	2,232
Residential real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	223,626	216,295
Multifamily
Aged analysis of past due loans
Total Loans	401,696	323,691
Multifamily | Special Mention [Member]
Aged analysis of past due loans
Total Loans	15,560	6,086
Multifamily | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,318	1,950
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	1,085	267
Multifamily | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		361
Multifamily | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	233	1,322
Multifamily | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	400,378	321,741
HELOC
Aged analysis of past due loans
Total Loans	103,237	109,202
Recorded Investment 90 days or Greater Past Due and Accruing	41
HELOC | Special Mention [Member]
Aged analysis of past due loans
Total Loans		111
HELOC | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	2,230	773
HELOC | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	565	291
HELOC | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1,396	90
HELOC | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	269	392
HELOC | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	101,007	108,429
Other
Aged analysis of past due loans
Total Loans	22,915	18,247
Other | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1	19
Other | 30 to 59 Days Past Due
Aged analysis of past due loans
Current		19
Other | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1
Other | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	$ 22,914	$ 18,228

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Nonaccruals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 67,583	$ 31,602
Nonaccrual with no ACL	33,099	18,404
Interest on nonaccrual loans	1,900
Accrued interest reversed against interest income	1,300
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	870	7,189
Nonaccrual with no ACL	870	6,598
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	639	1,876
Nonaccrual with no ACL	318
Commercial real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	16,572	4,346
Nonaccrual with no ACL	8,926	4,244
Commercial real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	34,946	8,050
Nonaccrual with no ACL	8,429	3,813
Real estate - construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,162	251
Nonaccrual with no ACL	7,162
Residential real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,331	1,528
Nonaccrual with no ACL	1,331	675
Residential real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,078	3,713
Nonaccrual with no ACL	3,078	1,572
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,775	2,538
Nonaccrual with no ACL	1,775	1,322
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,210	2,109
Nonaccrual with no ACL	$ 1,210	180
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		$ 2

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Credit Quality (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	$ 965,644,000	$ 1,136,566,000
2022 / 2021	997,009,000	891,538,000
2021 / 2020	737,065,000	491,635,000
2020 / 2019	367,981,000	286,716,000
2019 / 2018	192,786,000	181,960,000
Prior	306,846,000	253,054,000
Revolving Loans	474,214,000	628,140,000
Revolving Loans Converted To Term Loans	1,408,000
Total Loans	4,042,953,000	3,869,609,000
Minimum
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Loan commitment for inclusion in credit quality analysis	50,000
Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	963,994,000	1,128,206,000
2022 / 2021	958,129,000	840,608,000
2021 / 2020	682,010,000	416,572,000
2020 / 2019	344,237,000	196,708,000
2019 / 2018	158,932,000	165,598,000
Prior	280,746,000	233,105,000
Revolving Loans	450,136,000	600,854,000
Revolving Loans Converted To Term Loans	1,408,000
Total Loans	3,839,592,000	3,581,651,000
Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	1,650,000	2,078,000
2022 / 2021	20,320,000	33,207,000
2021 / 2020	35,050,000	70,495,000
2020 / 2019	3,621,000	31,990,000
2019 / 2018	1,863,000	9,731,000
Prior	3,681,000	10,131,000
Revolving Loans	4,392,000	21,397,000
Total Loans	70,577,000	179,029,000
Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		6,282,000
2022 / 2021	18,560,000	17,723,000
2021 / 2020	20,005,000	4,568,000
2020 / 2019	20,123,000	58,018,000
2019 / 2018	31,991,000	6,631,000
Prior	22,419,000	9,818,000
Revolving Loans	19,686,000	5,889,000
Total Loans	132,784,000	108,929,000
Commercial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	318,569,000	224,557,000
2022 / 2021	141,504,000	75,701,000
2021 / 2020	36,754,000	25,918,000
2020 / 2019	12,154,000	27,350,000
2019 / 2018	18,589,000	11,764,000
Prior	3,426,000	2,651,000
Revolving Loans	309,293,000	473,023,000
Revolving Loans Converted To Term Loans	1,408,000
Total Loans	841,697,000	840,964,000
Commercial | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	318,569,000	222,856,000
2022 / 2021	136,668,000	72,808,000
2021 / 2020	35,901,000	21,597,000
2020 / 2019	11,983,000	12,742,000
2019 / 2018	18,390,000	6,957,000
Prior	3,426,000	2,651,000
Revolving Loans	298,931,000	447,821,000
Revolving Loans Converted To Term Loans	1,408,000
Total Loans	825,276,000	787,432,000
Commercial | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		1,701,000
2022 / 2021	2,737,000	446,000
2021 / 2020	707,000	1,182,000
2020 / 2019	171,000	2,432,000
Revolving Loans	4,392,000	21,286,000
Total Loans	8,007,000	27,047,000
Commercial | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022 / 2021	2,099,000	2,447,000
2021 / 2020	146,000	3,139,000
2020 / 2019		12,176,000
2019 / 2018	199,000	4,807,000
Revolving Loans	5,970,000	3,916,000
Total Loans	8,414,000	26,485,000
Real estate - residential loans
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Mortgage loans in process of foreclosure	170,000	600,000
Leases
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	219,163,000	162,985,000
2022 / 2021	113,481,000	64,203,000
2021 / 2020	42,478,000	26,995,000
2020 / 2019	14,663,000	17,923,000
2019 / 2018	7,183,000	4,449,000
Prior	1,255,000	830,000
Total Loans	398,223,000	277,385,000
Leases | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	219,163,000	161,379,000
2022 / 2021	113,074,000	64,203,000
2021 / 2020	42,275,000	26,995,000
2020 / 2019	14,663,000	17,653,000
2019 / 2018	6,975,000	4,449,000
Prior	1,255,000	830,000
Total Loans	397,405,000	275,509,000
Leases | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		1,606,000
2022 / 2021	407,000
2021 / 2020	203,000
2020 / 2019		270,000
2019 / 2018	208,000
Total Loans	818,000	1,876,000
Commercial real estate - Investor
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	159,654,000	382,311,000
2022 / 2021	367,512,000	235,992,000
2021 / 2020	230,189,000	138,705,000
2020 / 2019	113,711,000	112,094,000
2019 / 2018	69,980,000	48,005,000
Prior	72,929,000	63,415,000
Revolving Loans	20,449,000	7,113,000
Total Loans	1,034,424,000	987,635,000
Commercial real estate - Investor | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	159,654,000	382,311,000
2022 / 2021	367,512,000	229,155,000
2021 / 2020	218,084,000	133,215,000
2020 / 2019	108,384,000	76,846,000
2019 / 2018	54,322,000	46,935,000
Prior	63,281,000	51,995,000
Revolving Loans	8,122,000	7,113,000
Total Loans	979,359,000	927,570,000
Commercial real estate - Investor | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022 / 2021		6,766,000
2021 / 2020	11,267,000	5,490,000
2020 / 2019		10,206,000
2019 / 2018		1,070,000
Prior		9,123,000
Total Loans	11,267,000	32,655,000
Commercial real estate - Investor | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022 / 2021		71,000
2021 / 2020	838,000
2020 / 2019	5,327,000	25,042,000
2019 / 2018	15,658,000
Prior	9,648,000	2,297,000
Revolving Loans	12,327,000
Total Loans	43,798,000	27,410,000
Commercial real estate - Owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	125,709,000	171,085,000
2022 / 2021	166,428,000	261,155,000
2021 / 2020	205,955,000	155,044,000
2020 / 2019	110,808,000	82,884,000
2019 / 2018	57,866,000	59,111,000
Prior	96,529,000	91,855,000
Revolving Loans	33,243,000	33,745,000
Total Loans	796,538,000	854,879,000
Commercial real estate - Owner occupied | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	124,059,000	168,776,000
2022 / 2021	134,383,000	223,731,000
2021 / 2020	177,553,000	105,669,000
2020 / 2019	103,109,000	47,351,000
2019 / 2018	42,839,000	49,597,000
Prior	91,062,000	87,357,000
Revolving Loans	33,243,000	33,745,000
Total Loans	706,248,000	716,226,000
Commercial real estate - Owner occupied | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	1,650,000
2022 / 2021	17,415,000	22,242,000
2021 / 2020	9,585,000	48,184,000
2020 / 2019	3,128,000	17,668,000
2019 / 2018	218,000	8,661,000
Prior	3,681,000	1,008,000
Total Loans	35,677,000	97,763,000
Commercial real estate - Owner occupied | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		2,309,000
2022 / 2021	14,630,000	15,182,000
2021 / 2020	18,817,000	1,191,000
2020 / 2019	4,571,000	17,865,000
2019 / 2018	14,809,000	853,000
Prior	1,786,000	3,490,000
Total Loans	54,613,000	40,890,000
Construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	42,808,000	52,508,000
2022 / 2021	66,513,000	66,308,000
2021 / 2020	32,942,000	54,839,000
2020 / 2019	10,093,000	3,588,000
2019 / 2018	1,593,000	226,000
Prior	8,245,000	1,543,000
Revolving Loans	3,186,000	1,523,000
Total Loans	165,380,000	180,535,000
Construction | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	42,808,000	52,508,000
2022 / 2021	66,513,000	66,308,000
2021 / 2020	32,942,000	39,542,000
2020 / 2019	100,000	2,390,000
2019 / 2018	1,593,000	226,000
Prior	1,083,000	1,408,000
Revolving Loans	3,186,000	1,523,000
Total Loans	148,225,000	163,905,000
Construction | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2021 / 2020		15,297,000
Total Loans		15,297,000
Construction | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2020 / 2019	9,993,000	1,198,000
Prior	7,162,000	135,000
Total Loans	17,155,000	1,333,000
Residential real estate - Investor
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	5,062,000	15,280,000
2022 / 2021	14,824,000	9,980,000
2021 / 2020	9,093,000	6,945,000
2020 / 2019	6,227,000	9,084,000
2019 / 2018	6,916,000	5,039,000
Prior	9,002,000	10,034,000
Revolving Loans	1,471,000	991,000
Total Loans	52,595,000	57,353,000
Residential real estate - Investor | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	5,062,000	14,659,000
2022 / 2021	14,434,000	9,910,000
2021 / 2020	9,027,000	6,945,000
2020 / 2019	6,227,000	8,585,000
2019 / 2018	6,508,000	4,853,000
Prior	8,469,000	9,626,000
Revolving Loans	1,471,000	991,000
Total Loans	51,198,000	55,569,000
Residential real estate - Investor | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022 / 2021		70,000
2021 / 2020	66,000
Total Loans	66,000	70,000
Residential real estate - Investor | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		621,000
2022 / 2021	390,000
2020 / 2019		499,000
2019 / 2018	408,000	186,000
Prior	533,000	408,000
Total Loans	1,331,000	1,714,000
Residential real estate - Owner occupied
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	32,574,000	41,885,000
2022 / 2021	41,528,000	44,906,000
2021 / 2020	40,335,000	28,655,000
2020 / 2019	25,513,000	17,114,000
2019 / 2018	14,918,000	12,283,000
Prior	70,617,000	73,237,000
Revolving Loans	763,000	1,638,000
Total Loans	226,248,000	219,718,000
Residential real estate - Owner occupied | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	32,574,000	41,885,000
2022 / 2021	41,528,000	44,884,000
2021 / 2020	40,335,000	28,418,000
2020 / 2019	25,322,000	16,146,000
2019 / 2018	14,233,000	12,152,000
Prior	68,277,000	70,741,000
Revolving Loans	763,000	1,638,000
Total Loans	223,032,000	215,864,000
Residential real estate - Owner occupied | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2022 / 2021		22,000
2021 / 2020		237,000
2020 / 2019	191,000	968,000
2019 / 2018	685,000	131,000
Prior	2,340,000	2,496,000
Total Loans	3,216,000	3,854,000
Multifamily
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	55,310,000	78,938,000
2022 / 2021	80,237,000	129,940,000
2021 / 2020	137,259,000	52,604,000
2020 / 2019	72,861,000	14,809,000
2019 / 2018	13,876,000	40,290,000
Prior	41,591,000	6,781,000
Revolving Loans	562,000	329,000
Total Loans	401,696,000	323,691,000
Multifamily | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	55,310,000	76,877,000
2022 / 2021	79,060,000	126,257,000
2021 / 2020	123,834,000	52,262,000
2020 / 2019	72,539,000	13,125,000
2019 / 2018	12,231,000	39,703,000
Prior	40,825,000	6,098,000
Revolving Loans	562,000	329,000
Total Loans	384,361,000	314,651,000
Multifamily | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		377,000
2022 / 2021	168,000	3,683,000
2021 / 2020	13,425,000	342,000
2020 / 2019	322,000	1,684,000
2019 / 2018	1,645,000
Total Loans	15,560,000	6,086,000
Multifamily | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		1,684,000
2022 / 2021	1,009,000
2019 / 2018		587,000
Prior	766,000	683,000
Total Loans	1,775,000	2,954,000
HELOC
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	2,735,000	2,822,000
2022 / 2021	2,704,000	518,000
2021 / 2020	491,000	1,497,000
2020 / 2019	1,798,000	1,703,000
2019 / 2018	1,780,000	724,000
Prior	3,179,000	2,597,000
Revolving Loans	90,550,000	99,341,000
Total Loans	103,237,000	109,202,000
HELOC | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	2,735,000	2,760,000
2022 / 2021	2,679,000	517,000
2021 / 2020	490,000	1,497,000
2020 / 2019	1,757,000	1,703,000
2019 / 2018	1,756,000	657,000
Prior	2,995,000	2,288,000
Revolving Loans	89,161,000	97,258,000
Total Loans	101,573,000	106,680,000
HELOC | Special Mention [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Revolving Loans		111,000
Total Loans		111,000
HELOC | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022		62,000
2022 / 2021	25,000	1,000
2021 / 2020	1,000
2020 / 2019	41,000
2019 / 2018	24,000	67,000
Prior	184,000	309,000
Revolving Loans	1,389,000	1,972,000
Total Loans	1,664,000	2,411,000
Other
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	4,060,000	4,195,000
2022 / 2021	2,278,000	2,835,000
2021 / 2020	1,569,000	433,000
2020 / 2019	153,000	167,000
2019 / 2018	85,000	69,000
Prior	73,000	111,000
Revolving Loans	14,697,000	10,437,000
Total Loans	22,915,000	18,247,000
Other | Pass [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023 / 2022	4,060,000	4,195,000
2022 / 2021	2,278,000	2,835,000
2021 / 2020	1,569,000	432,000
2020 / 2019	153,000	167,000
2019 / 2018	85,000	69,000
Prior	73,000	111,000
Revolving Loans	14,697,000	10,436,000
Total Loans	$ 22,915,000	18,245,000
Other | Substandard [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2021 / 2020		1,000
Revolving Loans		1,000
Total Loans		$ 2,000

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses on Loans - Charge-offs Activity by Loan Type (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans by risk rating
2023	$ 123
2022	9,247
2021	742
2020	10,587
2019	3,524
Prior	419
Total	24,642	$ 2,460	$ 5,933
Commercial
Loans by risk rating
2021	466
2020	364
Prior	55
Total	885	151	963
Leases
Loans by risk rating
2022	870
2019	12
Total	882	371	69
Commercial real estate - Investor
Loans by risk rating
2023	123
2022	8,352
2021	71
2020	3,270
Total	11,816	1,401	2,724
Commercial real estate - Owner occupied
Loans by risk rating
2022	22
2021	178
2020	6,947
2019	3,512
Prior	32
Total	10,691	133	1,797
Residential real estate - Owner occupied
Loans by risk rating
Total		2
Multifamily
Loans by risk rating
Total			183
HELOC
Loans by risk rating
Total			17
Other
Loans by risk rating
2022	3
2021	27
2020	6
Prior	332
Total	$ 368	$ 402	$ 180

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses on Loans - TDR (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) item
Troubled debt restructurings - modified during the period
Total Loans modified	$ 41,746
Other information
Number of payment modification | item	1
Commercial
Troubled debt restructurings - modified during the period
Total Loans modified	$ 3,979

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses on Loans - Loan Modifications (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)
Financing Receivable
Total Loans modified	$ 41,746
Total Loan Segment Modified to Total Loan Segment	1%
Weighted-Average Term Extension (In Months)	10 months 19 days
Weighted-Average Interest Rate Change	5%
Weighted-Average Delay of Payment (In Months)	7 months
30 to 59 Days Past Due
Financing Receivable
Total Loans modified	$ 838
90 Days or Greater Past Due
Financing Receivable
Total Loans modified	1,212
Total Past Due
Financing Receivable
Total Loans modified	2,050
Current
Financing Receivable
Total Loans modified	39,696
Term Extension
Financing Receivable
Total Loans modified	33,121
Combination - Term Extension and Payment Delay
Financing Receivable
Total Loans modified	7,646
Combination - Term Extension and Interest Rate Reduction
Financing Receivable
Total Loans modified	979
Commercial
Financing Receivable
Total Loans modified	$ 3,979
Total Loan Segment Modified to Total Loan Segment	0.50%
Weighted-Average Term Extension (In Months)	8 months 9 days
Weighted-Average Interest Rate Change	5%
Commercial | 90 Days or Greater Past Due
Financing Receivable
Total Loans modified	$ 979
Commercial | Total Past Due
Financing Receivable
Total Loans modified	979
Commercial | Current
Financing Receivable
Total Loans modified	3,000
Commercial | Term Extension
Financing Receivable
Total Loans modified	3,000
Commercial | Combination - Term Extension and Interest Rate Reduction
Financing Receivable
Total Loans modified	979
Commercial real estate - Investor
Financing Receivable
Total Loans modified	$ 21,167
Total Loan Segment Modified to Total Loan Segment	2%
Weighted-Average Term Extension (In Months)	9 months 29 days
Weighted-Average Delay of Payment (In Months)	7 months
Commercial real estate - Investor | 30 to 59 Days Past Due
Financing Receivable
Total Loans modified	$ 838
Commercial real estate - Investor | Total Past Due
Financing Receivable
Total Loans modified	838
Commercial real estate - Investor | Current
Financing Receivable
Total Loans modified	20,329
Commercial real estate - Investor | Term Extension
Financing Receivable
Total Loans modified	13,521
Commercial real estate - Investor | Combination - Term Extension and Payment Delay
Financing Receivable
Total Loans modified	7,646
Commercial real estate - Owner occupied
Financing Receivable
Total Loans modified	$ 16,082
Total Loan Segment Modified to Total Loan Segment	2%
Weighted-Average Term Extension (In Months)	11 months 19 days
Commercial real estate - Owner occupied | Current
Financing Receivable
Total Loans modified	$ 16,082
Commercial real estate - Owner occupied | Term Extension
Financing Receivable
Total Loans modified	16,082
Residential real estate - Owner occupied
Financing Receivable
Total Loans modified	$ 119
Total Loan Segment Modified to Total Loan Segment	0.10%
Weighted-Average Term Extension (In Months)	39 months
Residential real estate - Owner occupied | Current
Financing Receivable
Total Loans modified	$ 119
Residential real estate - Owner occupied | Term Extension
Financing Receivable
Total Loans modified	119
Multifamily
Financing Receivable
Total Loans modified	$ 233
Total Loan Segment Modified to Total Loan Segment	0.10%
Weighted-Average Term Extension (In Months)	21 months
Multifamily | 90 Days or Greater Past Due
Financing Receivable
Total Loans modified	$ 233
Multifamily | Total Past Due
Financing Receivable
Total Loans modified	233
Multifamily | Term Extension
Financing Receivable
Total Loans modified	233
HELOC
Financing Receivable
Total Loans modified	$ 166
Total Loan Segment Modified to Total Loan Segment	0.20%
Weighted-Average Term Extension (In Months)	24 months
HELOC | Current
Financing Receivable
Total Loans modified	$ 166
HELOC | Term Extension
Financing Receivable
Total Loans modified	$ 166

Loans and Allowance for Cred_13

Loans and Allowance for Credit Losses on Loans - Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loans to principal officers, directors, and their affiliates
Beginning balance	$ 8,483	$ 10,162
New loans, including acquired related party loans	30	267
Repayments and other reductions	(30)	(1,946)
Change in related party status	$ (8,483)
Ending balance		$ 8,483

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve
Balance at beginning of period	$ 1,561	$ 2,356	$ 2,474
Property additions, net of acquisition adjustments	5,580	87	5,748
Less: Proceeds from property disposals, net of participation purchase and of gains/losses	1,749	778	5,787
Less: Period valuation write-down	269	104	79
Balance at end of period	5,123	1,561	2,356
Activity in the valuation allowance
Balance at beginning of period	856	1,179	1,643
Provision for unrealized losses	269	104	79
Reductions taken on sales	(1,007)	(427)	(543)
Balance at end of period	118	856	1,179
Expenses related to foreclosed assets, net of lease revenue
Gain on sales, net	(256)	(163)	(41)
Provision for unrealized losses	269	104	79
Operating expenses	434	193	133
Less: Lease revenue	48	4	4
Net OREO expense	$ 399	$ 130	$ 167

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Premises and equipment
Cost	$ 153,284	$ 144,789
Accumulated Depreciation/Amortization	73,974	72,434
Net Book Value	79,310	72,355
Other Assets
Premises and equipment
Fixed Assets Held for Sale	1,000	4,600
Land
Premises and equipment
Cost	29,741	29,741
Net Book Value	29,741	29,741
Buildings
Premises and equipment
Cost	58,311	54,075
Accumulated Depreciation/Amortization	25,911	24,427
Net Book Value	32,400	29,648
Leasehold improvements
Premises and equipment
Cost	7,785	2,790
Accumulated Depreciation/Amortization	1,574	1,280
Net Book Value	6,211	1,510
Furniture and equipment
Premises and equipment
Cost	57,447	58,183
Accumulated Depreciation/Amortization	46,489	46,727
Net Book Value	$ 10,958	$ 11,456

Deposits - Classifications of D

Deposits - Classifications of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Deposits
Noninterest bearing demand	$ 1,834,891	$ 2,051,702
Savings	971,334	1,145,592
NOW accounts	565,375	609,338
Money market accounts	671,240	862,170
Certificates of deposit of less than $100,000	266,035	244,017
Certificates of deposit of $100,000 through $250,000	180,289	157,438
Certificates of deposit of more than $250,000	81,582	40,466
Total deposits	$ 4,570,746	$ 5,110,723

Deposits - Scheduled maturities

Deposits - Scheduled maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Brokered certificates
Brokered certificates of deposit	$ 30,700	$ 37,000
Deposits held by senior officers and directors, including their related interests	12,000	13,800
Time Deposit Maturities
2024	435,491
2025	63,409
2026	15,097
2027	5,401
2028	8,508
Total	$ 527,906	$ 441,921

Borrowings - Summary (Details)

Borrowings - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Borrowings
Total borrowings	$ 516,625	$ 260,811
Securities sold under repurchase agreements
Borrowings
Total borrowings	26,470	32,156
Other short-term borrowings
Borrowings
Total borrowings	405,000	90,000
Junior subordinated debentures
Borrowings
Total borrowings	25,773	25,773
Subordinated debentures
Borrowings
Total borrowings	$ 59,382	59,297
Senior notes
Borrowings
Total borrowings		44,585
Notes payable and other borrowings
Borrowings
Total borrowings		$ 9,000

Borrowings - Additional informa

Borrowings - Additional information (Details) $ in Thousands			1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 24, 2023 USD ($)	Feb. 24, 2020 USD ($)	Dec. 31, 2016	Jun. 30, 2023 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)
Borrowings
Securities available-for-sale, at fair value						$ 1,192,829	$ 1,539,359
Threshold percentage of stockholders' equity						10%
Borrowings at FHLBC as percentage of total assets						35%
FHLBC stock						$ 18,500	5,600
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock						33,355	20,530
Proceeds from term note		$ 30,000
Repayment of term note						9,000	4,000	$ 4,000
Senior notes							44,585
Basis points added to reference rate (as a percent)		1.75%
Outstanding, net of deferred issuance costs						59,400	59,300
Effective interest rate		6.32%
Total borrowings						516,625	260,811
Asset Pledged as Collateral with Right | Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars						45,700	71,400
GCFC/ABC Bank
Borrowings
Debt assumed									$ 23,400
Balance of borrowings paid off								$ 5,900
Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars						$ 26,500	32,200
Number of customers having secured balances exceeding specified percentage of stockholders equity | item						0
Total borrowings						$ 26,470	32,156
Securities sold under repurchase agreements | Minimum
Borrowings
Maturity						1 day
Securities sold under repurchase agreements | Maximum
Borrowings
Maturity						90 days
Federal Home Loan Bank Advances
Borrowings
Borrowings at FHLBC as percentage of book value of certain mortgage loans						60%
FHLBC advance amount						$ 405,000	90,000
FHLBC stock						18,500	5,600
Principal balance of loans collateralized						1,460,000	969,100
Maximum borrowing capacity						1,000,000
Combined collateral value						1,000,000
Amount available for additional borrowings						599,900
Subordinated debentures
Borrowings
Total borrowings						59,382	59,297
Notes Payable to Banks [Member]
Borrowings
Total borrowings							9,000
Junior subordinated debentures
Borrowings
Total borrowings						$ 25,773	$ 25,773
Senior Notes [Member]
Borrowings
Interest rate (as a percent)			5.75%
Debt Instrument, Term			10 years
Interest rate term			5 years
Effective interest rate				9.39%			8.62%
Debt issuance costs				$ 362
Total borrowings							$ 44,585
Debt instrument redemption price, percentage				12.85%		100%
Debt redeemed amount				$ 45,000
Senior Notes [Member] | Debt Instrument Variable Rate Base LIBOR [Member]
Borrowings
Basis points added to reference rate (as a percent)			3.85%
Term Debt
Borrowings
Proceeds from term note		$ 20,000
Repayment of term note	$ 9,000
Debt term		3 years
Subordinated Notes Due 2031
Borrowings
Interest rate (as a percent)					3.50%
Face amount					$ 60,000
Subordinated Notes Due 2031 | Three Months Secured Overnight Financing Rate
Borrowings
Basis points added to reference rate (as a percent)					2.73%

Borrowings - Maturities and Wei

Borrowings - Maturities and Weighted Average Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Scheduled maturities and weighted average rates of borrowings
Year one		$ 131,156
Year two	$ 431,470
Year four		44,585
Thereafter	85,155	85,070
Total borrowings	$ 516,625	$ 260,811
Weighted Average Rate
Year one (as a percent)		2.89%
Year two (as a percent)	4.98%
Year four (as a percent)		6.02%
Thereafter (as a percent)	4.10%	3.91%
Total borrowings (as a percent)	4.84%	3.76%

Junior Subordinated Debentures

Junior Subordinated Debentures - Issuance (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended	7 Months Ended	12 Months Ended
	Jun. 15, 2017	Apr. 30, 2007	Jun. 15, 2017	Dec. 31, 2017	Dec. 31, 2023	Dec. 31, 2022
Junior subordinated debentures
Junior subordinated debentures					$ 25,773	$ 25,773
Old Second Capital Trust II [Member]
Junior subordinated debentures
Proceeds from sale of cumulative trust preferred securities		$ 25,000
Maturity Period					30 years
Cash distribution fixed rate of trust preferred securities (as a percent)			6.77%
Basis points added to cash distribution floating rate base (as a percent)	1.50%			1.50%
Cash distribution, floating rate base	three-month				three-month SOFR
Amortization period					30 years
Old Second Capital Trust II [Member] | Debt Instrument, Redemption, Period One [Member]
Junior subordinated debentures
Interest rate (as a percent)					4.46%	4.42%
Junior subordinated debentures
Junior subordinated debentures
Junior Subordinated Debentures issuance cost					$ 1,000	$ 1,000
Junior subordinated debentures | Old Second Capital Trust II [Member]
Junior subordinated debentures
Junior subordinated debentures					$ 25,800

Income Taxes - Components (Deta

Income Taxes - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of income tax expense (benefit)
Current federal	$ 20,724	$ 13,241	$ 750
Current state	10,098	6,209	594
Deferred federal	1,964	3,338	4,445
Deferred state	(107)	1,356	2,034
Total tax at effective tax rate	32,679	24,144	$ 7,823
Deferred tax assets
Accrued Bonus	2,500	2,700
Allowance for credit losses	13,077	15,591
Deferred compensation	1,622	1,292
Stock based compensation	1,768	1,257
Business combination adjustments	270	1,138
Lease liability	3,201	682
Other assets	1,602	939
Total deferred tax assets	24,040	23,599
Deferred tax liabilities
Accumulated depreciation on premises and equipment	(5,454)	(4,107)
Goodwill amortization/impairment	(465)	(229)
Mortgage servicing rights	(2,842)	(3,103)
Amortization of core deposit intangible	(2,987)	(3,673)
Right of use asset	(1,969)	(682)
Acquired Securities	(2,376)	(1,921)
Other liabilities	(1,263)	(1,343)
Total deferred tax liabilities	(17,356)	(15,058)
Net deferred tax asset before adjustments related to other comprehensive income	6,684	8,541
Tax effect of adjustments related to other comprehensive loss	24,393	36,209
Net deferred tax asset	31,077	$ 44,750
Federal
Deferred tax liabilities
Net operating loss carryforward, which may be carried forward indefinitely	0
State and Local Jurisdiction
Deferred tax liabilities
Net operating loss carryforward	$ 0

Income Taxes - Components of De

Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Difference between effective tax rates and federal statutory rates applied to financial statement income
Tax at statutory federal income tax rate	$ 26,126	$ 19,225	$ 5,852
Nontaxable interest income, net of disallowed interest deduction	(947)	(1,097)	(1,069)
BOLI Income	(445)	(151)	(292)
State income taxes, net of federal benefit	7,911	6,091	2,054
Stock based compensation	(132)	(43)	54
Transaction costs			396
Other, net	166	119	828
Total tax at effective tax rate	$ 32,679	$ 24,144	$ 7,823

Equity Compensation Plans (Deta

Equity Compensation Plans (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	May 31, 2019
Equity Compensation Plans
Total compensation cost		$ 3.6	$ 3	$ 1.4
Vesting Percentage , Fully Vest , Performance measure		50%
Minimum
Equity Compensation Plans
Vesting Percentage , Fully Vest , Performance measure		50%
Maximum
Equity Compensation Plans
Vesting Percentage , Pro rata , Performance measure		50%
2019 Plan
Equity Compensation Plans
Number of shares authorized	1,800,000				600,000
Increase in number of shares authorized	1,200,000
Number of shares available for issuance		990,178
Restricted Stock and Restricted Stock Units [Member]
Equity Compensation Plans
Vesting period		3 years

Equity Compensation Plans - Res

Equity Compensation Plans - Restricted Stock and RSUs (Details) - Restricted Stock and Restricted Stock Units [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Changes in unvested awards
Nonvested at the beginning of the period (in shares)	649,210
Granted (in shares)	240,149	279,838
Vested (in shares)	(150,464)
Forfeited (in shares)	(29,658)
Nonvested at the end of the period (in shares)	709,237	649,210
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 12.84
Granted (in dollars per share)	17.02
Vested (in dollars per share)	12.56
Forfeited (in dollars per share)	14.14
Nonvested at the end of the period (in dollars per share)	$ 14.26	$ 12.84
Additional information
Total unrecognized compensation cost of restricted awards	$ 4
Expected weighted-average period for recognition of unrecognized compensation	1 year 8 months 12 days

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Basic earnings per share:
Weighted-average common shares outstanding	44,663,722	44,526,655	30,208,663
Net income	$ 91,729	$ 67,405	$ 20,044
Basic earnings per share	$ 2.05	$ 1.51	$ 0.66
Diluted earnings per share:
Weighted-average common shares outstanding	44,663,722	44,526,655	30,208,663
Diluted average common shares outstanding	45,395,010	45,213,088	30,737,862
Diluted earnings per share	$ 2.02	$ 1.49	$ 0.65
Restricted Stock and Restricted Stock Units [Member]
Diluted earnings per share:
Dilutive effect of share-based payment awards (in shares)	731,288	686,433	529,199

Commitments - Summary of Financ

Commitments - Summary of Financial Instrument Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Fixed Letters of Credit
Financial instrument commitments
Financial instrument commitments	$ 735	$ 6,675
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	735	6,675
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	173	3,514
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	562	3,161
Fixed Letters of Credit | Unused lines of Credit
Financial instrument commitments
Loan commitments	140,305	139,070
Variable Letters of Credit
Financial instrument commitments
Financial instrument commitments	30,377	29,421
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	30,310	29,354
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	16,621	15,365
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	13,689	13,989
Variable Letters of Credit | Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	67	67
Variable Letters of Credit | Unused lines of Credit
Financial instrument commitments
Loan commitments	694,960	860,255
Letter of Credit
Financial instrument commitments
Financial instrument commitments	31,112	36,096
Letter of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	31,045	36,029
Letter of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	16,794	18,879
Letter of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	14,251	17,150
Letter of Credit | Commitments to Extend Credit Nonborrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	67	67
Letter of Credit | Unused lines of Credit
Financial instrument commitments
Loan commitments	$ 835,265	$ 999,325

Commitments - Lease Commitments

Commitments - Lease Commitments and Legal Proceedings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Estimated aggregate minimum annual rental commitments
2024	$ 1,179,000
2025	1,021,000
2026	811,000
2027	770,000
2028	769,000
2029 and Thereafter	1,023,000
Aggregate future minimum rental income receivable under noncancelable leases	442,000
Total facility net operating lease revenue/expense	844,000	$ 396,000	$ 361,000
Total ATM lease expense	$ 2,100,000	$ 1,900,000	$ 1,200,000

Regulatory & Capital Matters (D

Regulatory & Capital Matters (Details) $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.1006	0.0814
Risk-based capital ratio (as a percent)	0.1406	0.1252
Phase out of impact of allowance for credit loss		$ 3.8
Deferment of impact on retained earnings	$ 1.9
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.1041	0.0932
Risk-based capital ratio (as a percent)	0.1324	0.1275
Minimum | Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.08
Risk-based capital ratio (as a percent)	0.12

Regulatory & Capital Matters -

Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Common equity tier 1 capital to risk weighted assets
Actual	$ 547,721	$ 457,206
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 337,207	$ 330,966
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1137%	0.0967%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.07%	0.07%
Total capital to risk weighted assets, Amount
Actual at period end	$ 677,076	$ 592,039
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 505,640	$ 496,518
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	0.1406	0.1252
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.1050	0.1050
Tier 1 capital to risk weighted assets, Amount
Actual	$ 572,721	$ 482,206
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 409,430	$ 401,838
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1189	0.1020
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.0850	0.0850
Tier 1 capital to average assets, Amount
Actual	$ 572,721	$ 482,206
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 227,722	$ 236,956
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	0.1006	0.0814
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.0400	0.0400
Subsidiaries [Member]
Common equity tier 1 capital to risk weighted assets
Actual	$ 592,413	$ 552,404
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	336,598	330,498
Minimum Required to Be Well Capitalized	$ 312,556	$ 306,891
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1232%	0.117%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.07%	0.07%
Minimum Required to Be Well Capitalized (as a percent)	0.065%	0.065%
Total capital to risk weighted assets, Amount
Actual at period end	$ 636,768	$ 602,237
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	504,990	495,960
Minimum Required to Be Well Capitalized	$ 480,943	$ 472,343
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	0.1324	0.1275
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.1050	0.1050
Minimum Required to Be Well Capitalized (as a percent)	0.1000	0.1000
Tier 1 capital to risk weighted assets, Amount
Actual	$ 592,413	$ 552,404
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	408,727	401,319
Minimum Required to Be Well Capitalized	$ 384,684	$ 377,712
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1232	0.1170
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.0850	0.0850
Minimum Required to Be Well Capitalized (as a percent)	0.0800	0.0800
Tier 1 capital to average assets, Amount
Actual	$ 592,413	$ 552,404
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	227,632	237,083
Minimum Required to Be Well Capitalized	$ 284,540	$ 296,354
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	0.1041	0.0932
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	0.0400	0.0400
Minimum Required to Be Well Capitalized (as a percent)	0.0500	0.0500

Regulatory & Capital Matters _2

Regulatory & Capital Matters - Dividend Restrictions and Deferrals (Details) - USD ($) $ in Millions	12 Months Ended		24 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Dividend Restrictions and Deferrals
Number of previous years retained profit considered for dividend payment	2 years
Minimum capital requirements, minimum percentage required	2.50%
Payments of dividends	$ 60.4
Percentage of increase in the allowance for credit losses		25%	50%

Mortgage Banking Derivatives (D

Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 52,100
Proceeds from sale of loan to investors	52,186	$ 81,776	$ 254,374
Gain on sale of loan	1,477	2,022	$ 9,300
Federal National Mortgage Association [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 30,500
Federal National Mortgage Association [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	60%
Federal Home Loan Mortgage Corporation [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 9,800
Federal Home Loan Mortgage Corporation [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	19.30%
Not Designated as Hedging Instrument | Forward Contracts [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	$ 6,000	2,750
Fair value	(46)	20
Not Designated as Hedging Instrument | Interest Rate Lock Commitments [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	1,312	2,548
Fair value	$ 36	$ 56

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset-backed Securities
Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value transfer assets into level 3		$ 15,012
Fair value transfer assets out of level 3	$ 14,885	(15,000)
Collateralized loan obligations.
Fair Value Assets and Liabilities Measured on Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value transfer assets into level 3		6,770
Fair value transfer assets out of level 3	$ 6,764	$ (6,800)

Fair Value Measurements - Recur

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Assets:
Securities available-for-sale	$ 1,192,829	$ 1,539,359
Mortgage servicing rights	$ 10,344	11,189
Derivative Asset Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true
Liabilities:
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag	true
U.S. Treasury
Assets:
Securities available-for-sale	$ 169,574	212,129
U.S. government agencies
Assets:
Securities available-for-sale	56,959	56,048
States and political subdivisions
Assets:
Securities available-for-sale	229,335	226,128
Corporate bonds
Assets:
Securities available-for-sale		9,622
Collateralized mortgage obligations
Assets:
Securities available-for-sale	392,544	533,768
Asset-backed Securities
Assets:
Securities available-for-sale	66,166	201,928
Collateralized loan obligations.
Assets:
Securities available-for-sale	171,881	174,746
Fair Value, Inputs, Level 1 [Member]
Assets:
Securities available-for-sale	169,574	212,129
Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	1,007,926	1,291,219
Loans held-for-sale	1,322	491
Other assets	5,302	6,391
Liabilities:
Other liabilities	8,324	12,264
Fair Value, Inputs, Level 3 [Member]
Assets:
Securities available-for-sale	15,329	36,011
Mortgage servicing rights	10,344	11,189
Fair Value, Measurements, Recurring [Member]
Assets:
Loans held-for-sale	1,322	491
Mortgage servicing rights	10,344	11,189
Total financial assets	1,209,876	1,557,631
Liabilities:
Total	8,324	12,265
Fair Value, Measurements, Recurring [Member] | Interest rate swap agreements, including risk participation agreement
Assets:
Other assets	5,391	6,516
Liabilities:
Other liabilities	8,324	12,265
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Assets:
Other assets	(10)	76
Fair Value, Measurements, Recurring [Member] | U.S. Treasury
Assets:
Securities available-for-sale	169,574	212,129
Fair Value, Measurements, Recurring [Member] | U.S. government agencies
Assets:
Securities available-for-sale	56,959	56,048
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	106,370	124,990
Fair Value, Measurements, Recurring [Member] | States and political subdivisions
Assets:
Securities available-for-sale	229,335	226,128
Fair Value, Measurements, Recurring [Member] | Corporate bonds
Assets:
Securities available-for-sale		9,622
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations
Assets:
Securities available-for-sale	392,544	533,768
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	66,166	201,928
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	171,881	174,746
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Total financial assets	169,574	212,129
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury
Assets:
Securities available-for-sale	169,574	212,129
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Loans held-for-sale	1,322	491
Total financial assets	1,014,629	1,298,302
Liabilities:
Total	8,324	12,265
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swap agreements, including risk participation agreement
Assets:
Other assets	5,391	6,516
Liabilities:
Other liabilities	8,324	12,265
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Assets:
Other assets	(10)	76
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agencies
Assets:
Securities available-for-sale	56,959	56,048
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	106,370	124,990
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	214,006	211,899
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds
Assets:
Securities available-for-sale		9,622
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations
Assets:
Securities available-for-sale	392,544	526,998
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	66,166	186,916
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	171,881	174,746
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Mortgage servicing rights	10,344	11,189
Total financial assets	25,673	47,200
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	$ 15,329	14,229
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Collateralized mortgage obligations
Assets:
Securities available-for-sale		6,770
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Asset-backed Securities
Assets:
Securities available-for-sale		$ 15,012

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Asset-backed Securities
Changes in Level 3
Beginning balance	$ 15,012
Transfers into Level 3		$ 15,012
Transfers out of Level 3	(14,885)	15,000
Total gains or losses
Included in earnings (or changes in net assets)	(11)
Included in other comprehensive income	226
Purchases, issuances, sales, and settlements
Settlements	(342)
Ending balance		15,012
Collateralized loan obligations.
Changes in Level 3
Beginning balance	6,770
Transfers into Level 3		6,770
Transfers out of Level 3	(6,764)	6,800
Total gains or losses
Included in other comprehensive income	(6)
Purchases, issuances, sales, and settlements
Ending balance		6,770
States and political subdivisions
Changes in Level 3
Beginning balance	14,229	15,236
Total gains or losses
Included in earnings (or changes in net assets)	(134)	(136)
Included in other comprehensive income	1,010	(86)
Purchases, issuances, sales, and settlements
Purchases	782	519
Settlements	(558)	(1,304)
Ending balance	15,329	14,229
Mortgage Servicing Rights [Member]
Changes in Level 3
Beginning balance	11,189	7,097
Total gains or losses
Included in earnings (or changes in net assets)	(924)	4,106
Purchases, issuances, sales, and settlements
Issuances	580	915
Settlements	(501)	(929)
Ending balance	$ 10,344	$ 11,189

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative and Qualitative Information (Details)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 10,344,000	$ 11,189,000
Securities available-for-sale, at fair value	1,192,829,000	1,539,359,000
Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	10,344,000	11,189,000
Securities available-for-sale, at fair value	15,329,000	36,011,000
Asset-backed Securities
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	66,166,000	201,928,000
States and political subdivisions
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	229,335,000	226,128,000
Collateralized mortgage obligations
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	392,544,000	533,768,000
Fair Value, Measurements, Recurring [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	10,344,000	11,189,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	10,344,000	11,189,000
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	66,166,000	201,928,000
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value		15,012,000
Fair Value, Measurements, Recurring [Member] | States and political subdivisions
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	229,335,000	226,128,000
Fair Value, Measurements, Recurring [Member] | States and political subdivisions | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	15,329,000	14,229,000
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	392,544,000	533,768,000
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value		6,770,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Asset-backed Securities | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value		$ 15,012,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Asset-backed Securities | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input		6.2
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Asset-backed Securities | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input		6.5
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Asset-backed Securities | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input		6.3
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 10,344,000	$ 11,189,000
Securities available-for-sale, at fair value		$ 6,770,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	9	9
Debt Securities, Measurement Input		7
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11	11
Debt Securities, Measurement Input		7
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	9	9
Debt Securities, Measurement Input		7
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	$ 15,329,000	$ 14,229,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	3.2
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	5.6
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	4.8	4.4
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	5.1	3.6
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	33	27.3
Fair Value, Measurements, Recurring [Member] | Measurement Input, Constant Prepayment Rate | Mortgage Servicing Rights [Member] | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	6.6	6.2
Fair Value, Measurements, Recurring [Member] | Measurement Input, Liquidity Premium | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Minimum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	0	0.3
Fair Value, Measurements, Recurring [Member] | Measurement Input, Liquidity Premium | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Maximum
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	0.5	0.5
Fair Value, Measurements, Recurring [Member] | Measurement Input, Liquidity Premium | States and political subdivisions | Discounted Cash Flow Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input	0.4
Fair Value, Measurements, Recurring [Member] | Measurement Input, Liquidity Premium | States and political subdivisions | Management Estimate of Credit Risk Exposure Valuation Technique [Member] | Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Debt Securities, Measurement Input		0.5

Fair Value Measurements - Nonre

Fair Value Measurements - Nonrecurring (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets and liabilities measured at fair value
Valuation allowance	$ 77,300,000
Carrying value of other real estate owned	5,123,000	$ 1,561,000	$ 2,356,000	$ 2,474,000
OREO Valuation allowance	118,000	856,000	$ 1,179,000	$ 1,643,000
Impaired Loans [Member]
Assets and liabilities measured at fair value
Valuation allowance		65,300,000
Impaired Loans [Member] | Reported Value Measurement [Member]
Assets and liabilities measured at fair value
Increase (decrease) of specific allocations within the provision for loan losses		12,200,000
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value
Total	71,303,000	49,261,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	66,180,000	47,700,000
Valuation allowance	11,100,000	17,600,000
Increase (decrease) of specific allocations within the provision for loan losses	6,500,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member] | Reported Value Measurement [Member]
Assets and liabilities measured at fair value
Total	77,300,000
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	5,123,000	1,561,000
Carrying value of other real estate owned	5,100,000	1,600,000
Outstanding balance	5,200,000	2,500,000
OREO Valuation allowance	118,000	131,000
OREO participations		856,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and liabilities measured at fair value
Total	71,303,000	49,261,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	66,180,000	47,700,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	$ 5,123,000	$ 1,561,000

Fair Values of Financial Inst_3

Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Financial assets:
Cash and due from banks	$ 55,534	$ 56,632
Interest earning deposits with financial institutions	44,611	58,545
Securities available-for-sale	1,192,829	1,539,359
FHLBC and FRBC Stock	33,355	20,530
Mortgage servicing rights	10,344	11,189
Financial liabilities:
Noninterest bearing deposits	1,834,891	2,051,702
Other short-term borrowings	405,000	90,000
Junior subordinated debentures	25,773	25,773
Senior notes		44,585
Reported Value Measurement
Financial assets:
Cash and due from banks	55,534	56,632
Interest earning deposits with financial institutions	44,611	58,545
Securities available-for-sale	1,192,829	1,539,359
FHLBC and FRBC Stock	33,355	20,530
Loans held for sale	1,322	491
Net loans	3,998,689	3,820,129
Mortgage servicing rights	10,344	11,189
Interest rate swap agreements	5,302	6,391
Interest rate lock commitments and forward contracts	(10)	76
Interest receivable on securities and loans	27,159	22,661
Financial liabilities:
Noninterest bearing deposits	1,834,891	2,051,702
Interest bearing deposits	2,735,855	3,059,021
Securities sold under repurchase agreements	26,470	32,156
Other short-term borrowings	405,000	90,000
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,382	59,297
Senior notes		44,585
Note payable and other borrowings		9,000
Interest rate swap agreements	8,324	12,264
Interest payable on deposits and borrowings	2,962	1,657
Estimate of Fair Value Measurement
Financial assets:
Cash and due from banks	55,534	56,632
Interest earning deposits with financial institutions	44,611	58,545
Securities available-for-sale	1,192,829	1,539,359
FHLBC and FRBC Stock	33,355	20,530
Loans held for sale	1,322	491
Net loans	3,876,381	3,681,387
Mortgage servicing rights	10,344	11,189
Interest rate swap agreements	5,302	6,391
Interest rate lock commitments and forward contracts	(10)	76
Interest receivable on securities and loans	27,159	22,661
Financial liabilities:
Noninterest bearing deposits	1,834,891	2,051,702
Interest bearing deposits	2,726,223	3,042,740
Securities sold under repurchase agreements	26,470	32,156
Other short-term borrowings	405,000	90,000
Junior subordinated debentures	20,361	21,907
Subordinated debentures	47,982	52,322
Senior notes		44,248
Note payable and other borrowings		8,984
Interest rate swap agreements	8,324	12,264
Interest payable on deposits and borrowings	2,962	1,657
Fair Value, Inputs, Level 1
Financial assets:
Cash and due from banks	55,534	56,632
Interest earning deposits with financial institutions	44,611	58,545
Securities available-for-sale	169,574	212,129
Financial liabilities:
Noninterest bearing deposits	1,834,891	2,051,702
Senior notes		44,248
Fair Value, Inputs, Level 2
Financial assets:
Securities available-for-sale	1,007,926	1,291,219
FHLBC and FRBC Stock	33,355	20,530
Loans held for sale	1,322	491
Interest rate swap agreements	5,302	6,391
Interest rate lock commitments and forward contracts	(10)	76
Interest receivable on securities and loans	27,159	22,661
Financial liabilities:
Interest bearing deposits	2,726,223	3,042,740
Securities sold under repurchase agreements	26,470	32,156
Other short-term borrowings	405,000	90,000
Junior subordinated debentures	20,361	21,907
Subordinated debentures	47,982	52,322
Note payable and other borrowings		8,984
Interest rate swap agreements	8,324	12,264
Interest payable on deposits and borrowings	2,962	1,657
Fair Value, Inputs, Level 3
Financial assets:
Securities available-for-sale	15,329	36,011
Net loans	3,876,381	3,681,387
Mortgage servicing rights	$ 10,344	$ 11,189

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Fair Value of Derivatives (Details)	12 Months Ended
	Dec. 31, 2023 USD ($) item	Dec. 31, 2023 USD ($) item	Dec. 31, 2022 USD ($) item
Two financial institutions
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Cash collateral pledged with financial institutions, dollars	$ 7,300,000	$ 7,300,000	$ 11,200,000
Number of financial institutions in which cash collateral pledged | item		2
Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Investment securities pledged with financial institutions, dollars	$ 0	$ 0	$ 0
Number of financial institutions in which cash collateral pledged	4,100,000	1	5,300,000
Designated as Hedging Instrument
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value	$ 2,576,000	$ 2,576,000	$ 2,737,000
Derivative liabilities designated as hedging instruments, fair value	$ 5,598,000	$ 5,598,000	$ 8,610,000
Designated as Hedging Instrument | Interest Rate Products | OSBC Affiliates
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	5	5	4
Notional amount	$ 325,774,000	$ 325,774,000	$ 275,774,000
Derivative assets designated as hedging instruments, fair value	2,576,000	2,576,000	2,737,000
Derivative liabilities designated as hedging instruments, fair value	5,598,000	5,598,000	8,610,000
Designated as Hedging Instrument | Interest Rate Swap [Member] | Cash flow hedges of certain variable rate commercial and commercial real estate loan pools
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	300,000,000	300,000,000	250,000,000
Designated as Hedging Instrument | Interest Rate Swap [Member] | Cash flow hedge of junior subordinated debentures and was executed to pay fixed and receive variable rate cash flows
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	25,800,000	25,800,000	25,800,000
Not Designated as Hedging Instrument
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value	2,805,000	2,805,000	3,855,000
Derivative liabilities designated as hedging instruments, fair value	$ 2,726,000	$ 2,726,000	$ 3,655,000
Not Designated as Hedging Instrument | Interest Rate Products | Commercial Loan Customers
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	17	17	21
Notional amount	$ 104,777,000	$ 104,777,000	$ 110,647,000
Derivative assets designated as hedging instruments, fair value	2,726,000	2,726,000	3,654,000
Derivative liabilities designated as hedging instruments, fair value	2,726,000	2,726,000	3,654,000
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	104,800,000	104,800,000	110,600,000
Not Designated as Hedging Instrument | Commitments.
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	$ 8,400,000	$ 8,400,000	$ 5,300,000
Not Designated as Hedging Instrument | Interest Rate Lock Commitments and Forward Contracts.
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	24	24	28
Notional amount	$ 8,375,000	$ 8,375,000	$ 5,298,000
Derivative assets designated as hedging instruments, fair value	$ 10,000	$ 10,000	$ 76,000
Not Designated as Hedging Instrument | Other Contracts
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	4	4	4
Notional amount	$ 44,790,000	$ 44,790,000	$ 43,699,000
Derivative assets designated as hedging instruments, fair value	89,000	89,000	125,000
Derivative liabilities designated as hedging instruments, fair value			1,000
Not Designated as Hedging Instrument | Forward Contracts [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	6,000,000	6,000,000	$ 2,750,000
Interest Income
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount to be reclassified as an decrease to interest expense during the next twelve months	5,100,000	5,100,000
Interest Expense
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount to be reclassified as an decrease to interest expense during the next twelve months	$ 546,000	$ 546,000

Financial Instruments with Of_4

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions - Effect of Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount of gain reclassified from AOCI to interest income	$ 2,200,000	$ 4,200,000	$ 2,400,000
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 5,600,000	$ 373,000	$ 56,000

Preferred Stock (Details)

Preferred Stock (Details) - shares	Dec. 31, 2023	Dec. 31, 2022
Preferred Stock.
Preferred stock, Shares authorized	300,000	300,000

Parent Company Condensed Fina_3

Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Other assets	$ 63,592	$ 56,012
Total assets	5,722,799	5,888,317
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,382	59,297
Senior notes		44,585
Other liabilities	58,147	55,642
Stockholders' equity	577,281	461,141	$ 502,027	$ 307,087
Total liabilities and stockholders' equity	5,722,799	5,888,317
Parent Company
Assets
Noninterest bearing deposit with bank subsidiary	36,686	39,167
Investment in subsidiaries	620,663	555,140
Other assets	6,183	6,526
Total assets	663,532	600,833
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,382	59,297
Senior notes		44,585
Notes Payable		9,000
Other liabilities	1,096	1,037
Stockholders' equity	577,281	461,141
Total liabilities and stockholders' equity	$ 663,532	$ 600,833

Parent Company Condensed Fina_4

Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Expenses
Junior subordinated debentures	$ 1,095	$ 1,136	$ 1,133
Subordinated debentures	2,185	2,185	1,610
Senior notes	2,408	2,682	2,692
Income before income taxes and equity in undistributed net income of subsidiaries	124,408	91,549	27,867
Income tax benefit	32,679	24,144	7,823
Net income	91,729	67,405	20,044
Parent Company
Operating Income
Cash dividends received from subsidiaries	65,000	40,000	40,000
Other income	67	29	15
Total operating income	65,067	40,029	40,015
Operating Expenses
Junior subordinated debentures	1,095	1,136	1,133
Subordinated debentures	2,185	2,185	1,610
Senior notes	2,408	2,682	2,692
Notes payable	87	385	291
Other expenses	5,947	5,086	6,918
Total operating expense	11,722	11,474	12,644
Income before income taxes and equity in undistributed net income of subsidiaries	53,345	28,555	27,371
Income tax benefit	(3,309)	(3,216)	(2,986)
Income before equity in undistributed net income of subsidiaries	56,654	31,771	30,357
Equity in undistributed net income of subsidiaries	35,075	35,634	(10,313)
Net income	$ 91,729	$ 67,405	$ 20,044

Parent Company Condensed Fina_5

Parent Company Condensed Financial Information - Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash Flows from Operating Activities
Net Income (Loss)	$ 91,729	$ 67,405	$ 20,044
Adjustments to reconcile net income to net cash from operating activities:
Change in taxes payable	(4,872)	12,048	(9,286)
Stock based compensation	3,603	2,960	1,435
Net cash provided by operating activities	116,401	97,344	31,047
Cash Flows from Investing Activities
Cash paid for acquisition, net of cash and cash equivalents acquired		(146)	148,995
Net cash provided by (used in) investing activities	161,555	(432,778)	132,918
Cash Flows from Financing Activities
Dividends paid on common stock	(8,946)	(8,877)	(4,612)
Purchases of treasury stock	(605)	(455)	(10,417)
Issuance of sub debt			59,148
Repayment of term note		(6,056)	(315)
Repayment of senior notes	(45,000)
Net cash (used in) provided by financing activities	(292,988)	(301,496)	258,239
Net change in cash and cash equivalents	(15,032)	(636,930)	422,204
Cash and cash equivalents at beginning of period	115,177	752,107	329,903
Cash and cash equivalents at end of period	100,145	115,177	752,107
Parent Company
Cash Flows from Operating Activities
Net Income (Loss)	91,729	67,405	20,044
Adjustments to reconcile net income to net cash from operating activities:
Equity in undistributed net income of subsidiaries	(35,075)	(35,634)	10,313
Provision for deferred tax expense (benefit)	(513)	91	(248)
Change in taxes payable	794	(4,694)	(695)
Change in other assets	(43)	12	(12)
Stock based compensation	3,603	2,960	1,435
Other, net	575	(2,753)	961
Net cash provided by operating activities	61,070	27,387	31,798
Cash Flows from Investing Activities
Cash paid for acquisition, net of cash and cash equivalents acquired			(94,406)
Net cash provided by (used in) investing activities			(94,406)
Cash Flows from Financing Activities
Dividends paid on common stock	(8,946)	(8,877)	(4,612)
Purchases of treasury stock	(605)	(455)	(10,417)
Issuance of sub debt			59,148
Repayment of term note	(9,000)	(4,000)	(4,000)
Repayment of senior notes	(45,000)
Net cash (used in) provided by financing activities	(63,551)	(13,332)	40,119
Net change in cash and cash equivalents	(2,481)	14,055	(22,489)
Cash and cash equivalents at beginning of period	39,167	25,112	47,601
Cash and cash equivalents at end of period	$ 36,686	$ 39,167	$ 25,112

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended			36 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2023
Employee Benefit Plans
Expense relating to the 401(k) plan	$ 2.2	$ 2	$ 1.4
Old Second Bancorp Inc Employees 401(k) Savings Plan and Trust
Employee Benefit Plans
Company's discretionary matching contributions to the Plan (as a percent)	100%	100%	100%
Company's discretionary matching contributions to the Plan (as a percent)				50%
Percentage of compensation contributed to the Plan matched by employer (as a percent)				2%
Percentage of compensation contributed to the Plan matched by employer	3%	3%	3%
Participants vesting as percentage of discretionary matching contributions	100%

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net Income (Loss)	$ 91,729	$ 67,405	$ 20,044

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false