Old Second Bancorp (OSBC) 10-K 9 Mar 23 2022 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 07, 2023	Jun. 30, 2022
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
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
Entity Shell Company	false
Entity Public Float			$ 563.5
Entity Common Stock, Shares Outstanding		44,665,127
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
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, 2022	Dec. 31, 2021
Assets
Cash and due from banks	$ 56,632	$ 38,565
Interest earning deposits with financial institutions	58,545	713,542
Cash and cash equivalents	115,177	752,107
Securities available-for-sale, at fair value	1,539,359	1,693,632
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock	20,530	13,257
Loans held-for-sale	491	4,737
Loans	3,869,609	3,420,804
Less: allowance for credit losses on loans	49,480	44,281
Net loans	3,820,129	3,376,523
Premises and equipment, net	72,355	88,005
Other real estate owned	1,561	2,356
Mortgage servicing rights, at fair value	11,189	7,097
Goodwill	86,478	86,332
Core deposit intangible	13,678	16,304
Bank-owned life insurance ("BOLI")	106,608	105,300
Deferred tax assets, net	44,750	6,100
Other assets	56,012	60,439
Total assets	5,888,317	6,212,189
Deposits:
Noninterest bearing demand	2,051,702	2,087,649
Interest bearing:
Savings, NOW, and money market	2,617,100	2,874,773
Time	441,921	503,810
Total deposits	5,110,723	5,466,232
Securities sold under repurchase agreements	32,156	50,337
Other short-term borrowings	90,000
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,297	59,212
Senior notes	44,585	44,480
Notes payable and other borrowings	9,000	19,074
Other liabilities	55,642	45,054
Total liabilities	5,427,176	5,710,162
Stockholders' Equity
Common stock	44,705	44,705
Additional paid-in capital	202,276	202,443
Retained earnings	310,512	252,011
Accumulated other comprehensive (loss) income	(93,124)	8,768
Treasury stock	(3,228)	(5,900)
Total stockholders' equity	461,141	502,027
Total liabilities and stockholders' equity	$ 5,888,317	$ 6,212,189

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
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	44,582,311	44,461,045
Treasury stock, Shares	122,839	244,105

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest and dividend income
Loans, including fees	$ 176,379	$ 90,613	$ 90,923
Loans held-for-sale	130	165	306
Securities:
Taxable	31,566	8,168	6,773
Tax exempt	5,287	5,107	5,471
Dividends from FHLBC and FRBC stock	936	456	484
Interest bearing deposits with financial institutions	2,175	656	258
Total interest and dividend income	216,473	105,165	104,215
Interest expense
Savings, NOW, and money market deposits	1,900	961	1,569
Time deposits	1,448	1,510	5,033
Securities sold under repurchase agreements	40	82	202
Other short-term borrowings	480		179
Junior subordinated debentures	1,136	1,133	2,215
Subordinated debt	2,185	1,610
Senior notes	2,682	2,692	2,692
Notes payable and other borrowings	446	462	574
Total interest expense	10,317	8,450	12,464
Net interest and dividend income	206,156	96,715	91,751
Provision for credit losses	6,550	4,326	10,413
Net interest and dividend income after provision for credit losses	199,606	92,389	81,338
Noninterest income
Mortgage servicing rights mark to market gain (loss)	3,177	1,261	(3,999)
Net gain on sales of mortgage loans	2,022	9,300	15,519
Securities (losses) gains, net	(944)	232	(25)
Change in cash surrender value of BOLI	718	1,390	1,233
Death benefit realized on BOLI			57
Card related income	10,989	6,712	5,532
Other income	5,243	2,329	2,149
Total noninterest income	43,116	39,260	37,487
Noninterest expense
Salaries and employee benefits	86,573	57,691	49,547
Occupancy, furniture and equipment	14,992	13,548	8,498
Computer and data processing	15,795	7,936	5,143
FDIC insurance	2,401	975	597
Net teller & bill paying	3,730	874	648
General bank insurance	1,221	1,214	1,030
Amortization of core deposit intangible	2,626	644	494
Advertising expense	589	343	298
Card related expense	4,348	2,538	2,195
Legal fees	873	1,096	761
Consulting & management fees	2,425	5,005	760
Other real estate expense, net	130	151	651
Other expense	15,470	11,767	10,795
Total noninterest expense	151,173	103,782	81,417
Income before income taxes	91,549	27,867	37,408
Provision for income taxes	24,144	7,823	9,583
Net income available to common stockholders	$ 67,405	$ 20,044	$ 27,825
Basic earnings per share	$ 1.51	$ 0.66	$ 0.94
Diluted earnings per share	1.49	0.65	0.92
Dividends declared per share	$ 0.20	$ 0.16	$ 0.04
Wealth management
Noninterest income
Service charges on deposits	$ 9,887	$ 9,408	$ 7,905
Secondary mortgage fees
Noninterest income
Service charges on deposits	332	1,044	1,654
Bank Servicing
Noninterest income
Service charges on deposits	9,562	5,403	5,512
Mortgage servicing income
Noninterest income
Service charges on deposits	$ 2,130	$ 2,181	$ 1,950

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Consolidated Statements of Comprehensive (Loss) Income
Net Income	$ 67,405	$ 20,044	$ 27,825
Unrealized holding (losses) gains on available-for-sale securities arising during the period	(139,876)	(8,513)	14,690
Related tax benefit (expense)	39,166	2,406	(4,122)
Holding (losses) gains, after tax, on available-for-sale securities	(100,710)	(6,107)	10,568
Less: Reclassification adjustment for the net (losses) gains realized during the period
Net realized (losses) gains	(944)	232	(25)
Related tax benefit (expense)	265	(65)	7
Net realized (losses) gains after tax	(679)	167	(18)
Other comprehensive (loss) income on available-for-sale securities	(100,031)	(6,274)	10,586
Changes in fair value of derivatives used for cash flow hedges	(2,579)	389	(533)
Related tax benefit (expense)	718	(109)	147
Other comprehensive (loss) income on cash flow hedges	(1,861)	280	(386)
Total other comprehensive (loss) income	(101,892)	(5,994)	10,200
Total comprehensive (loss) income	$ (34,487)	$ 14,050	$ 38,025

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities
Net income	$ 67,405	$ 20,044	$ 27,825
Adjustments to reconcile net income to net cash provided by operating activities:
Net premium / discount amortization on securities	5,217	2,932	2,329
Securities losses (gains), net	944	(232)	25
Provision for credit losses	6,550	4,326	10,413
Originations of loans held-for-sale	(76,607)	(239,175)	(384,379)
Proceeds from sales of loans held-for-sale	81,776	254,374	388,538
Net gains on sales of mortgage loans	(2,022)	(9,300)	(15,519)
Mortgage servicing rights mark to market (gain) loss	(3,177)	(1,261)	3,999
Net accretion of discount on loans and unfunded commitments	(6,339)	(1,177)	(911)
Net change in cash surrender value of BOLI	(718)	(1,390)	(1,233)
Net gains on sale of other real estate owned	(163)	(41)	(204)
Provision for other real estate owned valuation losses	104	79	357
Depreciation of fixed assets and amortization of leasehold improvements	4,085	3,152	2,798
Write-down of fixed assets		3,809
Net gains on disposal and transfer of fixed assets	(2,017)
Amortization of core deposit intangibles	2,626	644	494
Change in current income taxes receivable	12,048	(9,286)	811
Deferred tax expense (benefit)	969	6,479	(646)
Change in accrued interest receivable and other assets	(940)	6,865	(17,692)
Accretion of purchase accounting adjustment on time deposits	(1,582)	(155)
Change in accrued interest payable and other liabilities	6,225	(11,075)	6,893
Stock-based compensation	2,960	1,435	2,089
Net cash provided by operating activities	97,344	31,047	25,987
Cash flows from investing activities
Proceeds from maturities and calls, including pay down of securities available-for-sale	279,848	138,874	48,054
Proceeds from sales of securities available-for-sale	30,981	605,846	18,006
Purchases of securities available-for-sale	(301,649)	(886,103)	(65,229)
Proceeds from redemption of FHLBC/FRBC stock	1,444
Purchases of FHLBC/FRBC stock	(8,717)
Net change in loans	(443,904)	122,102	(103,887)
Purchases of BOLI policies	(590)	(591)	(590)
Proceeds from claims on BOLI, net of claims receivable			484
Proceeds from sales of other real estate owned, net of participations and improvements	941	5,828	3,275
Proceeds from disposition of premises and equipment	13,346
Net purchases of premises and equipment	(4,332)	(2,033)	(3,921)
Cash paid for acquisition, net of cash and cash equivalents retained	(146)	148,995
Net cash used in investing activities	(432,778)	132,918	(103,808)
Cash flows from financing activities
Net change in deposits	(353,927)	235,078	410,324
Net change in securities sold under repurchase agreements	(18,181)	(16,643)	18,287
Net change in other short-term borrowings	90,000		(48,500)
Redemption of junior subordinated debentures			(32,604)
Issuance of subordinated debentures, net of issuance costs		59,148
Issuance of term note			20,000
Repayment of term note	(4,000)	(4,000)	(3,000)
Net change in notes payable and other borrowings, excluding term note	(6,056)	(315)	(307)
Dividends paid on common stock	(8,877)	(4,612)	(1,186)
Purchase of treasury stock	(455)	(10,417)	(5,922)
Net cash (used in) provided by financing activities	(301,496)	258,239	357,092
Net change in cash and cash equivalents	(636,930)	422,204	279,271
Cash and cash equivalents at beginning of year	752,107	329,903	50,632
Cash and cash equivalents at end of year	115,177	752,107	329,903
Supplemental cash flow information
Income taxes paid, net	10,324	10,612	7,922
Interest paid for deposits	3,418	2,752	7,255
Interest paid for borrowings	6,777	5,366	5,093
Non-cash transfer of loans to other real estate owned	87	$ 196	$ 898
Non-cash transfer of fixed assets to other assets	$ 4,568

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock	Additional Paid-in Capital	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment	Total
Balance at Dec. 31, 2019	$ 34,854	$ 120,657		$ 213,723	$ 4,562	$ (95,932)		$ 277,864
Increase (Decrease) in Stockholders' Equity
Net Income				27,825				27,825
Other comprehensive income loss, net of tax					10,200			10,200
Dividends declared on common stock				(1,186)				(1,186)
Vesting of restricted stock	103	(534)				431
Stock based compensation		2,089						2,089
Purchase of treasury stock from taxes withheld on stock awards						(423)		(423)
Purchase of treasury stock from stock repurchase program						(5,499)		(5,499)
Balance at Dec. 31, 2020	34,957	122,212	$ (3,783)	236,579	14,762	(101,423)	$ (3,783)	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

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 502,027	$ 307,087	$ 277,864
Other comprehensive (loss) income, net of tax	(101,892)	(5,994)	10,200
Balance	$ 461,141	$ 502,027	$ 307,087
Dividend declared and paid (per share)	$ 0.20	$ 0.16	$ 0.04
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 8,768	$ 14,762	$ 4,562
Other comprehensive (loss) income, net of tax	(101,892)	(5,994)	10,200
Balance	(93,124)	8,768	14,762
Accumulated Unrealized Gain (Loss) on Securities Available-for-Sale
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	11,139	17,413	6,827
Other comprehensive (loss) income, net of tax	(100,031)	(6,274)	10,586
Balance	(88,892)	11,139	17,413
Accumulated Unrealized Gain (Loss) on Derivative Instruments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(2,371)	(2,651)	(2,265)
Other comprehensive (loss) income, net of tax	(1,861)	280	(386)
Balance	$ (4,232)	$ (2,371)	$ (2,651)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
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 Melrose Holdings LLC and Station I, LLC, both of which hold 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 2022 presentation. ​ Use of Estimates ​ Principles of Consolidation – ​ Segment Reporting ​ Concentration of Credit Risk ​ Cash and Cash Equivalents – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, interest-earning deposits in other financial institutions, and other short-term investments, such as federal funds sold and securities purchased under agreements to resell. The classification of cash and cash equivalents includes those assets held in the form of cash or liquid instruments with an original maturity of 90 days or less. ​ 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 ​ 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. ​ Troubled Debt Restructurings (“TDRs”) ​ A restructuring of debt is considered a TDR when (i) the borrower is experiencing financial difficulties and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity, that it would not otherwise consider. Loans are not classified as TDRs when the modification is short-term or results in only an insignificant delay or shortfall in the payments to be received. The Company’s TDRs are determined on a case-by-case basis in connection with ongoing loan collection processes. ​ The Company does not accrue interest on any TDRs unless it believes collection of all principal and interest under the modified terms is reasonably assured. For TDRs to accrue interest, the borrower must demonstrate both some level of past performance and the capacity to perform under the modified terms. Generally, six months of consecutive payment performance by the borrower under the restructured terms is required before TDRs are returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower’s current creditworthiness is used to assess whether the borrower has the capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. ​ 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 unless the Company has identified an expected troubled debt restructuring. ​ 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 – Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition loans and other commercial and industrial business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. The Company classifies five different risk levels for this segment to assign a loss rate based on historical losses, and also performs an analysis using expectations for the weighted risk rating trends to run a regression analysis to a severe loss scenario to determine adjustments needed within the special mention and substandard sub-segments . ​ 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 sponsored compared to owner occupied. ​ Real estate – construction loans – The Company defines real estate - construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement or development of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, they are subject to other industry specific policy guidelines outlined in the Company’s Credit Risk Policy and are monitored closely. The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ​ Real estate - residential loans ● Residential owner-occupied – 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 – 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 – 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 analysis for construction, residential investor, residential owner occupied and the HELOC segments; and (iii) a WARM (weighted average remaining life) 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 – Premises, furniture, equipment, and leasehold improvements are stated at cost less accumulated depreciation and amortization. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term including anticipated renewals. Rates of depreciation are generally based on the following useful lives: buildings, 25 to 40 years ; building improvements, 3 to 15 years or longer under limited circumstances; and furniture and equipment, 3 to 10 years . Gains and losses on dispositions are included in other noninterest expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that conform to definitions of tangible property improvements are capitalized and depreciated over the estimated remaining life. ​ 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 $771.4 million and $801.9 million at December 31, 2022, and 2021, 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 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, and 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 quantitative assessment of goodwill as of November 30, 2022 which resulted in the fair value of the Company exceeding the carrying value; therefore, it was determined goodwill was not impaired at December 31, 2022. The quantitative assessment was performed as a matter of periodic practice rather than as a response to a qualitative assessment. On November 30, 2021, the Company performed a qualitative assessment of goodwill from which we concluded it was more likely than not that goodwill was not impaired as of December 31, 2021. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2022, CDI totaled $13.7 million compared to $16.3 million at December 31, 2021. The total CDI amount reflects the acquisition of West Suburban in 2021 as well as ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $2.6 million, $644,000 , and $494,000 was recorded in 2022, 2021, and 2020, respectively. The expected future annual amortization expense for each of the next five years (2023-2027) is approximately $2.5 million, $2.3 million, $2.1 million, $1.8 million, and $1.6 million, respectively. ​ Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheets as a direct reduction from the carrying value of that debt liability. The deferred issuance costs are amortized over the life the related debt instrument, and included within the debt’s interest expense. ​ 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, 2022 and 2021 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, 2022 or 2021. The Company is currently open to audit under the statute of limitations for Federal taxes from 2019 to 2021 and various state jurisdictions from 2017 to 2021. ​ 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 has developed a project plan to assess the use of alternative indexes and to seek to ensure all financial instruments that reference LIBOR are identified, quantified, and researched for the LIBOR fallback language available or needed. The Company has completed the ISDA protocol adherence for LIBOR fallback language for all commercial swaps, has met with its commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by Old Second National Bank (the “Bank”) for new loans to ensure appropriate fallback language is included. We have 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 have been updated to handle multiple SOFR-based indexes and we continue to meet regularly to plan for the transition of existing LIBOR exposures prior to the final LIBOR cessation date of June 30, 2023. ​ ASU 2022-01 Derivatives and Hedging (Topic 815): Fair Value Hedging – Portfolio Layer Method ​ The Company is currently reviewing ASU 2022-01 for the impact to derivative measurement and disclosures, and will assess any revisions needed for reporting purposes in the next quarter. The Company anticipates adopting ASU 2022-01 no later than January 1, 2023. The Company does not expect a material impact upon adoption. ​ ASU 2022-02 Financial Instruments-Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures ​ The Company is currently reviewing ASU 2022-02 for the impact to TDR recognition, measurement and disclosures, and will assess any revisions needed for reporting purposes in the next quarter. The Company anticipates adopting ASU 2022-02 as of January 1, 2023. ​ Su

Acquisition

Acquisition	12 Months Ended
	Dec. 31, 2022
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, 2022 and December 31, 2021, 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, 2022 ​ ​ As of December 31, 2021 ​ ​ PCD ​ Non-PCD ​ Total ​ ​ PCD ​ Non-PCD ​ Total West Suburban acquired loans ​ $ 75,396 ​ $ 1,059,363 ​ $ 1,134,759 ​ ​ $ 102,409 ​ $ 1,418,752 ​ $ 1,521,161 ABC Bank acquired loans ​ ​ 1,786 ​ ​ 31,895 ​ ​ 33,681 ​ ​ ​ 4,547 ​ ​ 64,236 ​ ​ 68,783 Talmer Bank acquired loans ​ ​ - ​ ​ 15,693 ​ ​ 15,693 ​ ​ ​ - ​ ​ 45,858 ​ ​ 45,858 Total acquired loans net book value ​ $ 77,182 ​ $ 1,106,951 ​ $ 1,184,133 ​ ​ $ 106,956 ​ $ 1,528,846 ​ $ 1,635,802 Accretion recorded on acquired loans year to date ​ $ 848 ​ $ 4,726 ​ $ 5,574 ​ ​ $ 401 ​ $ 565 ​ $ 966 Accretion recorded on acquired unfunded commitments year to date ​ ​ ​ ​ ​ ​ ​ $ 893 ​ ​ ​ ​ ​ ​ ​ ​ $ 74 ​ 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, 2022
Cash and Due from Banks.
Cash and Due from Banks	Note 3: Cash and Due from Banks ​ Total cash and cash equivalents were $115.2 million and $752.1 million at December 31, 2022 and 2021, 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, 2022
Securities
Securities	Note 4: Securities ​ The following table summarizes the amortized cost and fair value of the securities portfolio at December 31, 2022 and 2021, and the corresponding amounts of gross unrealized gains and losses were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2021 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,251 ​ $ 125 ​ $ (37) ​ $ 202,339 U.S. government agencies ​ ​ 62,587 ​ ​ - ​ ​ (699) ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ 172,016 ​ ​ 856 ​ ​ (570) ​ ​ 172,302 States and political subdivisions ​ ​ 241,937 ​ ​ 16,344 ​ ​ (672) ​ ​ 257,609 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (113) ​ ​ 9,887 Collateralized mortgage obligations ​ ​ 673,238 ​ ​ 2,014 ​ ​ (2,285) ​ ​ 672,967 Asset-backed securities ​ ​ 236,293 ​ ​ 1,245 ​ ​ (661) ​ ​ 236,877 Collateralized loan obligations ​ ​ 79,838 ​ ​ 3 ​ ​ (78) ​ ​ 79,763 Total securities available-for-sale ​ $ 1,678,160 ​ $ 20,587 ​ $ (5,115) ​ $ 1,693,632 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $6.8 million and $4.3 million at December 31, 2022 and December 31, 2021, respectively, that is recorded in other assets on the consolidated balance sheet. ​ FHLBC stock was $5.6 million and $7.1 million at December 31, 2022 and December 31, 2021, respectively. FRBC stock was $14.9 million at December 31, 2022 and $6.2 million at December 31, 2021. Our FHLBC stock is necessary to maintain access to FHLBC advances. ​ Securities valued at $547.8 million as of December 31, 2022, were pledged to secure deposits and borrowings, and for other purposes, an increase from $501.3 million at year-end 2021. ​ The fair value, amortized cost and weighted average yield of debt securities at December 31, 2022 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 ​ $ 62,369 ​ 0.69 % ​ $ 60,279 ​ Due after one year through five years ​ ​ 247,711 ​ 1.14 ​ ​ ​ 231,925 ​ Due after five years through ten years ​ ​ 43,941 ​ 2.75 ​ ​ ​ 39,785 ​ Due after ten years ​ ​ 181,210 ​ 3.04 ​ ​ ​ 171,938 ​ ​ ​ ​ 535,231 ​ 1.86 ​ ​ ​ 503,927 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 736,924 ​ 2.53 ​ ​ ​ 658,758 ​ Asset-backed securities ​ ​ 210,388 ​ 4.77 ​ ​ ​ 201,928 ​ Collateralized loan obligations ​ ​ 180,276 ​ 6.21 ​ ​ ​ 174,746 ​ Total securities available-for-sale ​ $ 1,662,819 ​ 3.00 % ​ $ 1,539,359 ​ ​ At December 31, 2022, the Company’s investments include asset-backed securities totaling $160.8 million that are backed by student loans originated under the Federal Family Education Loan program (“FFEL”). Under the FFEL, private lenders made federally guaranteed student loans to parents and students. While the program was modified several times before elimination in 2010, FFEL securities are generally guaranteed by the U.S. Department of Education (“DOE”) at not less than 97% of the principal amount of the loans. The guarantee will reduce to 85% if the DOE receives reimbursement requests in excess of 5% of insured loans; reimbursement will drop to 75% if reimbursement requests exceed 9% of insured loans. As of December 31, 2022, the likelihood of the decrease in the government guarantee was minimal as the average rate of reimbursement for 2022 was less than 1.0%. ​ As of December 31, 2022, 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, 2022 and 2021, 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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ 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 ​ $ 37 ​ $ 49,719 ​ - ​ $ - ​ $ - ​ 1 ​ $ 37 ​ $ 49,719 U.S. government agencies ​ 5 ​ ​ 592 ​ ​ 56,879 ​ 4 ​ ​ 107 ​ ​ 5,008 ​ 9 ​ ​ 699 ​ ​ 61,887 U.S. government agencies mortgage-backed ​ 63 ​ ​ 505 ​ ​ 78,711 ​ 1 ​ ​ 65 ​ ​ 1,663 ​ 64 ​ ​ 570 ​ ​ 80,374 States and political subdivisions ​ 7 ​ ​ 55 ​ ​ 8,430 ​ 1 ​ ​ 617 ​ ​ 4,051 ​ 8 ​ ​ 672 ​ ​ 12,481 Corporate bonds ​ 2 ​ ​ 113 ​ ​ 9,887 ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 113 ​ ​ 9,887 Collateralized mortgage obligations ​ 133 ​ ​ 2,285 ​ ​ 381,658 ​ - ​ ​ - ​ ​ - ​ 133 ​ ​ 2,285 ​ ​ 381,658 Asset-backed securities ​ 20 ​ ​ 608 ​ ​ 103,819 ​ 3 ​ ​ 53 ​ ​ 3,276 ​ 23 ​ ​ 661 ​ ​ 107,095 Collateralized loan obligations ​ 10 ​ ​ 35 ​ ​ 45,132 ​ 2 ​ ​ 43 ​ ​ 10,628 ​ 12 ​ ​ 78 ​ ​ 55,760 Total securities available-for-sale ​ 241 ​ $ 4,230 ​ $ 734,235 ​ 11 ​ $ 885 ​ $ 24,626 ​ 252 ​ $ 5,115 ​ $ 758,861 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Available-for-sale debt securities in unrealized loss positions are evaluated for allowance related to credit losses at least quarterly. T 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 2022 2021 2020 ​ Proceeds from sales of securities ​ ​ $ 30,981 ​ $ 605,846 ​ $ 18,006 ​ Gross realized gains on securities ​ ​ - ​ 270 ​ 17 ​ Gross realized losses on securities ​ ​ (944) ​ (38) ​ (42) ​ Net realized (losses) gains ​ ​ $ (944) ​ $ 232 ​ $ (25) ​ Income tax benefit (expense) on net realized (losses) gains ​ ​ $ 265 ​ $ (65) ​ $ 7 ​ Effective tax rate applied ​ ​ ​ 28.1 % ​ 28.0 % ​ 28.0 % ​

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	12 Months Ended
	Dec. 31, 2022
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, 2022 December 31, 2021 Commercial 1 ​ $ 840,964 ​ $ 771,474 Leases ​ ​ 277,385 ​ ​ 176,031 Commercial real estate – investor ​ ​ 987,635 ​ ​ 799,928 Commercial real estate – owner occupied ​ ​ 854,879 ​ ​ 731,845 Construction ​ ​ 180,535 ​ ​ 206,132 Residential real estate – investor ​ ​ 57,353 ​ ​ 63,399 Residential real estate – owner occupied ​ ​ 219,718 ​ ​ 213,248 Multifamily ​ ​ 323,691 ​ ​ 309,164 HELOC ​ ​ 109,202 ​ ​ 126,290 Other 2 ​ ​ 18,247 ​ ​ 23,293 Total loans ​ ​ 3,869,609 ​ ​ 3,420,804 Allowance for credit losses on loans ​ ​ (49,480) ​ ​ (44,281) Net loans 3 ​ $ 3,820,129 ​ $ 3,376,523 ​ 1 Includes $1.6 million and $38.4 million of PPP loans outstanding at December 31, 2022 and 2021, respectively. ​ 2 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. ​ 3 Excludes accrued interest receivable of $15.9 million and $9.2 million at December 31, 2022 and December 31, 2021, respectively, which is recorded in other assets on the consolidated balance sheet. ​ 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 life) 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 70.6% and 71.6% of the portfolio at December 31, 2022 and December 31, 2021, respectively, and include a mix of owner and non-owner occupied commercial real estate, residential, construction and multifamily loans. ​ ​ The following table represent the activity in the ACL for loans for the year ended December 31, 2022, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses 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 Allowance for credit losses ​ Balance ​ WSB Acquisition ​ (Release of) ​ ​ ​ ​ ​ Balance ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ ​ Impact of Provision ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ ​ Adopting for Loan ​ ​ ​ ​ ​ Balance Allowance for loan and lease losses: January 1, 2020 ​ ASC 326 Losses Charge-offs Recoveries December 31, 2020 Commercial ​ $ 3,015 ​ ​ (292) ​ $ 72 ​ $ 39 ​ $ 56 ​ $ 2,812 Leases ​ ​ 1,262 ​ ​ 501 ​ ​ 2,233 ​ ​ 206 ​ ​ 98 ​ ​ 3,888 Commercial real estate – Investor ​ ​ 6,218 ​ ​ (741) ​ ​ 2,769 ​ ​ 512 ​ ​ 165 ​ ​ 7,899 Commercial real estate – Owner occupied ​ ​ 3,678 ​ ​ (848) ​ ​ 1,793 ​ ​ 1,763 ​ ​ 697 ​ ​ 3,557 Construction ​ ​ 513 ​ ​ 1,334 ​ ​ 2,095 ​ ​ 60 ​ ​ 172 ​ ​ 4,054 Residential real estate – Investor ​ ​ 601 ​ ​ 740 ​ ​ 350 ​ ​ 8 ​ ​ 57 ​ ​ 1,740 Residential real estate – Owner occupied ​ ​ 1,257 ​ ​ 1,320 ​ ​ (107) ​ ​ 43 ​ ​ 287 ​ ​ 2,714 Multifamily ​ ​ 1,444 ​ ​ 1,732 ​ ​ 449 ​ ​ - ​ ​ - ​ ​ 3,625 HELOC ​ ​ 1,161 ​ ​ 1,526 ​ ​ (933) ​ ​ 193 ​ ​ 387 ​ ​ 1,948 Other ​ ​ 640 ​ ​ 607 ​ ​ 445 ​ ​ 244 ​ ​ 170 ​ ​ 1,618 Total ​ $ 19,789 ​ $ 5,879 ​ $ 9,166 ​ $ 3,068 ​ $ 2,089 ​ $ 33,855 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2021 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 1,986 ​ $ 9,901 ​ $ - ​ $ - ​ $ 11,887 ​ $ 2,677 Leases ​ ​ - ​ ​ - ​ ​ 3,249 ​ ​ 505 ​ ​ 3,754 ​ ​ 811 Commercial real estate – investor ​ ​ 5,693 ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,693 ​ ​ - Commercial real estate – owner occupied ​ ​ 9,147 ​ ​ - ​ ​ - ​ ​ 2,490 ​ ​ 11,637 ​ ​ 362 Construction ​ ​ 2,104 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 ​ ​ 992 Residential real estate – investor ​ ​ 925 ​ ​ - ​ ​ - ​ ​ - ​ ​ 925 ​ ​ - Residential real estate – owner occupied ​ ​ 4,271 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,271 ​ ​ 276 Multifamily ​ ​ 1,845 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,845 ​ ​ 75 HELOC ​ ​ 1,006 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,006 ​ ​ 190 Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 7 ​ ​ 7 ​ ​ 4 Total ​ $ 26,977 ​ $ 9,901 ​ $ 3,249 ​ $ 3,002 ​ $ 43,129 ​ $ 5,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ Aged analysis of past due loans by class of loans as of December 31, 2021 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, 2021 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3,407 ​ $ 1,413 ​ $ 1,828 ​ $ 6,648 ​ $ 764,826 ​ $ 771,474 ​ $ 1,396 Leases ​ ​ 125 ​ ​ - ​ ​ 1,571 ​ ​ 1,696 ​ ​ 174,335 ​ ​ 176,031 ​ ​ - Commercial real estate – investor ​ ​ - ​ ​ 267 ​ ​ 1,107 ​ ​ 1,374 ​ ​ 798,554 ​ ​ 799,928 ​ ​ - Commercial real estate – owner occupied ​ ​ 2,324 ​ ​ 500 ​ ​ 4,848 ​ ​ 7,672 ​ ​ 724,173 ​ ​ 731,845 ​ ​ 1,594 Construction ​ ​ 854 ​ ​ - ​ ​ - ​ ​ 854 ​ ​ 205,278 ​ ​ 206,132 ​ ​ - Residential real estate – investor ​ ​ 395 ​ ​ 470 ​ ​ 792 ​ ​ 1,657 ​ ​ 61,742 ​ ​ 63,399 ​ ​ 23 Residential real estate – owner occupied ​ ​ 1,994 ​ ​ 591 ​ ​ 3,077 ​ ​ 5,662 ​ ​ 207,586 ​ ​ 213,248 ​ ​ 97 Multifamily ​ ​ - ​ ​ 1,046 ​ ​ - ​ ​ 1,046 ​ ​ 308,118 ​ ​ 309,164 ​ ​ - HELOC ​ ​ 193 ​ ​ 23 ​ ​ 398 ​ ​ 614 ​ ​ 125,676 ​ ​ 126,290 ​ ​ - Other ​ ​ 50 ​ ​ 46 ​ ​ 23 ​ ​ 119 ​ ​ 23,174 ​ ​ 23,293 ​ ​ - Total ​ $ 9,342 ​ $ 4,356 ​ $ 13,644 ​ $ 27,342 ​ $ 3,393,462 ​ $ 3,420,804 ​ $ 3,110 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. ​ ​ As of December 31, 2021, seven loans of the original 509 loans modified under the CARES act, or $7.8 million, had an active deferral request and were in compliance with modified terms; 502 loans which totaled $234.9 million had resumed payments or paid off. As of December 31, 2021, six of the seven deferred loans, or $7.7 million, are in nonaccrual status. As of December 31, 2022, there are no loans in deferral and all 509 loans had resumed payment under original loan terms, or paid off. ​ 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, 2022 With no ACL December 31, 2021 With no ACL Commercial ​ $ 7,189 ​ $ 6,598 ​ $ 11,894 ​ $ 9,217 Leases ​ ​ 1,876 ​ ​ - ​ ​ 3,754 ​ ​ 2,943 Commercial real estate – investor ​ ​ 4,346 ​ ​ 4,244 ​ ​ 5,694 ​ ​ 5,694 Commercial real estate – owner occupied ​ ​ 8,050 ​ ​ 3,813 ​ ​ 11,637 ​ ​ 11,205 Construction ​ ​ 251 ​ ​ - ​ ​ 160 ​ ​ 160 Residential real estate – investor ​ ​ 1,528 ​ ​ 675 ​ ​ 876 ​ ​ 876 Residential real estate – owner occupied ​ ​ 3,713 ​ ​ 1,572 ​ ​ 4,898 ​ ​ 4,622 Multifamily ​ ​ 2,538 ​ ​ 1,322 ​ ​ 1,573 ​ ​ 1,573 HELOC ​ ​ 2,109 ​ ​ 180 ​ ​ 1,042 ​ ​ 852 Other ​ ​ 2 ​ ​ - ​ ​ 3 ​ ​ 3 Total ​ $ 31,602 ​ $ 18,404 ​ $ 41,531 ​ $ 37,145 ​ The Company recognized $284,000 of interest on nonaccrual loans during the year ended December 31, 2022. 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, 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 ​ $ 225,056 ​ $ 70,608 ​ $ 21,597 ​ $ 12,742 ​ $ 6,957 ​ $ 2,651 ​ $ 447,821 ​ $ - ​ $ 787,432 Special Mention ​ ​ 1,875 ​ ​ 272 ​ ​ 1,182 ​ ​ 2,432 ​ ​ - ​ ​ - ​ ​ 21,286 ​ ​ - ​ ​ 27,047 Substandard ​ ​ 4,958 ​ ​ 2,447 ​ ​ 2,981 ​ ​ 12,176 ​ ​ 7 ​ ​ - ​ ​ 3,916 ​ ​ - ​ ​ 26,485 Total commercial ​ ​ 231,889 ​ ​ 73,327 ​ ​ 25,760 ​ ​ 27,350 ​ ​ 6,964 ​ ​ 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 ​ ​ 416,094 ​ ​ 228,686 ​ ​ 118,491 ​ ​ 63,845 ​ ​ 46,935 ​ ​ 46,406 ​ ​ 7,113 ​ ​ - ​ ​ 927,570 Special Mention ​ ​ 5,349 ​ ​ 1,417 ​ ​ 5,490 ​ ​ 10,206 ​ ​ 1,070 ​ ​ 9,123 ​ ​ - ​ ​ - ​ ​ 32,655 Substandard ​ ​ 12,332 ​ ​ 2,018 ​ ​ - ​ ​ 10,763 ​ ​ - ​ ​ 2,297 ​ ​ - ​ ​ - ​ ​ 27,410 Total commercial real estate – investor ​ ​ 433,775 ​ ​ 232,121 ​ ​ 123,981 ​ ​ 84,814 ​ ​ 48,005 ​ ​ 57,826 ​ ​ 7,113 ​ ​ - ​ ​ 987,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 169,703 ​ ​ 223,731 ​ ​ 105,669 ​ ​ 47,351 ​ ​ 49,367 ​ ​ 86,660 ​ ​ 33,745 ​ ​ - ​ ​ 716,226 Special Mention ​ ​ 8,430 ​ ​ 22,242 ​ ​ 48,184 ​ ​ 17,668 ​ ​ 231 ​ ​ 1,008 ​ ​ - ​ ​ - ​ ​ 97,763 Substandard ​ ​ 2,546 ​ ​ 17,129 ​ ​ 1,191 ​ ​ 16,962 ​ ​ - ​ ​ 3,062 ​ ​ - ​ ​ - ​ ​ 40,890 Total commercial real estate – owner occupied ​ ​ 180,679 ​ ​ 263,102 ​ ​ 155,044 ​ ​ 81,981 ​ ​ 49,598 ​ ​ 90,730 ​ ​ 33,745 ​ ​ - ​ ​ 854,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 53,058 ​ ​ 65,758 ​ ​ 39,542 ​ ​ 2,390 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 163,905 Special Mention ​ ​ - ​ ​ - ​ ​ 15,297 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,297 Substandard ​ ​ 1,217 ​ ​ - ​ ​ - ​ ​ 116 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,333 Total construction ​ ​ 54,275 ​ ​ 65,758 ​ ​ 54,839 ​ ​ 2,506 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 180,535 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 14,737 ​ ​ 9,910 ​ ​ 6,945 ​ ​ 8,585 ​ ​ 4,853 ​ ​ 9,548 ​ ​ 991 ​ ​ - ​ ​ 55,569 Special Mention ​ ​ - ​ ​ 70 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 70 Substandard ​ ​ 621 ​ ​ - ​ ​ - ​ ​ 499 ​ ​ 186 ​ ​ 408 ​ ​ - ​ ​ - ​ ​ 1,714 Total residential real estate – investor ​ ​ 15,358 ​ ​ 9,980 ​ ​ 6,945 ​ ​ 9,084 ​ ​ 5,039 ​ ​ 9,956 ​ ​ 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 ​ ​ 131 ​ ​ 267 ​ ​ 237 ​ ​ 723 ​ ​ 131 ​ ​ 2,365 ​ ​ - ​ ​ - ​ ​ 3,854 Total residential real estate – owner occupied ​ ​ 42,016 ​ ​ 45,151 ​ ​ 28,655 ​ ​ 16,869 ​ ​ 12,283 ​ ​ 73,106 ​ ​ 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 ​ ​ 2,100 ​ ​ - ​ ​ - ​ ​ - ​ ​ 587 ​ ​ 267 ​ ​ - ​ ​ - ​ ​ 2,954 Total multifamily ​ ​ 79,354 ​ ​ 129,940 ​ ​ 52,604 ​ ​ 14,809 ​ ​ 40,290 ​ ​ 6,365 ​ ​ 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 ​ ​ 1,165,744 ​ ​ 837,389 ​ ​ 401,848 ​ ​ 183,707 ​ ​ 165,368 ​ ​ 226,741 ​ ​ 600,854 ​ ​ - ​ ​ 3,581,651 Special Mention ​ ​ 16,031 ​ ​ 27,684 ​ ​ 70,495 ​ ​ 31,990 ​ ​ 1,301 ​ ​ 10,131 ​ ​ 21,397 ​ ​ - ​ ​ 179,029 Substandard ​ ​ 25,573 ​ ​ 21,862 ​ ​ 4,410 ​ ​ 41,509 ​ ​ 978 ​ ​ 8,708 ​ ​ 5,889 ​ ​ - ​ ​ 108,929 Total loans ​ $ 1,207,348 ​ $ 886,935 ​ $ 476,753 ​ $ 257,206 ​ $ 167,647 ​ $ 245,580 ​ $ 628,140 ​ $ - ​ $ 3,869,609 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit quality indicators by class of loans as of December 31, 2021 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 192,258 ​ $ 50,638 ​ $ 38,614 ​ $ 28,177 ​ $ 5,176 ​ $ 10,945 ​ $ 408,394 ​ $ 30 ​ $ 734,232 Special Mention ​ ​ 44 ​ ​ 84 ​ ​ 694 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,708 ​ ​ - ​ ​ 4,530 Substandard ​ ​ 9,498 ​ ​ 4,048 ​ ​ 14,121 ​ ​ 326 ​ ​ - ​ ​ 75 ​ ​ 4,644 ​ ​ - ​ ​ 32,712 Total commercial ​ ​ 201,800 ​ ​ 54,770 ​ ​ 53,429 ​ ​ 28,503 ​ ​ 5,176 ​ ​ 11,020 ​ ​ 416,746 ​ ​ 30 ​ ​ 771,474 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 83,402 ​ ​ 44,129 ​ $ 32,259 ​ ​ 8,950 ​ ​ 1,170 ​ ​ 2,367 ​ ​ - ​ ​ - ​ ​ 172,277 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 2,834 ​ ​ 623 ​ ​ - ​ ​ 297 ​ ​ - ​ ​ - ​ ​ 3,754 Total leases ​ ​ 83,402 ​ ​ 44,129 ​ ​ 35,093 ​ ​ 9,573 ​ ​ 1,170 ​ ​ 2,664 ​ ​ - ​ ​ - ​ ​ 176,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 245,346 ​ ​ 175,218 ​ ​ 118,697 ​ ​ 85,049 ​ ​ 64,810 ​ ​ 55,523 ​ ​ 18,602 ​ ​ - ​ ​ 763,245 Special Mention ​ ​ 15,466 ​ ​ - ​ ​ 10,550 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 26,016 Substandard ​ ​ 2,238 ​ ​ 2,378 ​ ​ 451 ​ ​ 181 ​ ​ 3,612 ​ ​ 1,807 ​ ​ - ​ ​ - ​ ​ 10,667 Total commercial real estate – investor ​ ​ 263,050 ​ ​ 177,596 ​ ​ 129,698 ​ ​ 85,230 ​ ​ 68,422 ​ ​ 57,330 ​ ​ 18,602 ​ ​ - ​ ​ 799,928 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 290,225 ​ ​ 155,353 ​ ​ 90,325 ​ ​ 60,915 ​ ​ 54,236 ​ ​ 59,887 ​ ​ 2,522 ​ ​ - ​ ​ 713,463 Special Mention ​ ​ - ​ ​ - ​ ​ 2,953 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,953 Substandard ​ ​ 8,318 ​ ​ 942 ​ ​ 1,686 ​ ​ - ​ ​ 1,251 ​ ​ 3,232 ​ ​ - ​ ​ - ​ ​ 15,429 Total commercial real estate – owner occupied ​ ​ 298,543 ​ ​ 156,295 ​ ​ 94,964 ​ ​ 60,915 ​ ​ 55,487 ​ ​ 63,119 ​ ​ 2,522 ​ ​ - ​ ​ 731,845 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 88,620 ​ ​ 65,629 ​ ​ 37,169 ​ ​ 2,727 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 196,958 Special Mention ​ ​ - ​ ​ 2,138 ​ ​ 4,932 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,070 Substandard ​ ​ 160 ​ ​ - ​ ​ - ​ ​ 1,944 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 Total construction ​ ​ 88,780 ​ ​ 67,767 ​ ​ 42,101 ​ ​ 4,671 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 206,132 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,371 ​ ​ 9,758 ​ ​ 13,084 ​ ​ 6,392 ​ ​ 7,059 ​ ​ 10,602 ​ ​ 1,868 ​ ​ - ​ ​ 62,134 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 121 ​ ​ 144 ​ ​ - ​ ​ 197 ​ ​ 385 ​ ​ 418 ​ ​ - ​ ​ - ​ ​ 1,265 Total residential real estate – investor ​ ​ 13,492 ​ ​ 9,902 ​ ​ 13,084 ​ ​ 6,589 ​ ​ 7,444 ​ ​ 11,020 ​ ​ 1,868 ​ ​ - ​ ​ 63,399 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 48,009 ​ ​ 31,912 ​ ​ 20,990 ​ ​ 13,304 ​ ​ 30,562 ​ ​ 60,661 ​ ​ 2,052 ​ ​ - ​ ​ 207,490 Special Mention ​ ​ 659 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 659 Substandard ​ ​ 322 ​ ​ 183 ​ ​ 6 ​ ​ 1,219 ​ ​ 176 ​ ​ 3,193 ​ ​ - ​ ​ - ​ ​ 5,099 Total residential real estate – owner occupied ​ ​ 48,990 ​ ​ 32,095 ​ ​ 20,996 ​ ​ 14,523 ​ ​ 30,738 ​ ​ 63,854 ​ ​ 2,052 ​ ​ - ​ ​ 213,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 109,175 ​ ​ 71,748 ​ ​ 39,293 ​ ​ 61,190 ​ ​ 11,399 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 299,986 Special Mention ​ ​ - ​ ​ - ​ ​ 6,900 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,900 Substandard ​ ​ 433 ​ ​ - ​ ​ - ​ ​ 1,543 ​ ​ 302 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,278 Total multifamily ​ ​ 109,608 ​ ​ 71,748 ​ ​ 46,193 ​ ​ 62,733 ​ ​ 11,701 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 309,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 805 ​ ​ 1,667 ​ ​ 12,315 ​ ​ 104,843 ​ ​ - ​ ​ 124,759 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 108 ​ ​ - ​ ​ 108 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 17 ​ ​ 12 ​ ​ 376 ​ ​ 1,018 ​ ​ - ​ ​ 1,423 Total HELOC ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 822 ​ ​ 1,679 ​ ​ 12,691 ​ ​ 105,969 ​ ​ - ​ ​ 126,290 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 8,659 ​ ​ 1,099 ​ ​ 437 ​ ​ 254 ​ ​ 1,414 ​ ​ 4,214 ​ ​ 7,206 ​ ​ - ​ ​ 23,283 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 7 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10 Total other ​ ​ 8,659 ​ ​ 1,102 ​ ​ 437 ​ ​ 261 ​ ​ 1,414 ​ ​ 4,214 ​ ​ 7,206 ​ ​ - ​ ​ 23,293 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,079,972 ​ ​ 607,575 ​ ​ 392,999 ​ ​ 267,763 ​ ​ 177,970 ​ ​ 224,824 ​ ​ 546,694 ​ ​ 30 ​ ​ 3,297,827 Special Mention ​ ​ 16,169 ​ ​ 2,222 ​ ​ 26,029 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,816 ​ ​ - ​ ​ 48,236 Substandard ​ ​ 21,090 ​ ​ 7,698 ​ ​ 19,098 ​ ​ 6,057 ​ ​ 5,738 ​ ​ 9,398 ​ ​ 5,662 ​ ​ - ​ ​ 74,741 Total loans ​ $ 1,117,231 ​ $ 617,495 ​ $ 438,126 ​ $ 273,820 ​ $ 183,708 ​ $ 234,222 ​ $ 556,172 ​ $ 30 ​ $ 3,420,804 ​ The Company had $600,000 and $488,000 in consumer mortgage loans in the process of foreclosure as of December 31, 2022 and December 31, 2021, respectively. ​ Troubled debt restructurings (“TDRs”) are loans for which the contractual terms have been modified and both of these conditions exist: (1) there is a concession to the borrower and (2) the borrower is experiencing financial difficulties. Loans are restructured on a case-by-case basis during the loan collection process with modifications generally initiated at the request of the borrower. These modifications may include reduction in interest rates, extension of term, deferrals of principal, and other modifications. The Bank participates in the U.S. Department of the Treasury’s (the “Treasury”) Home Affordable Modification Program (“HAMP”) which gives qualifying homeowners an opportunity to refinance into more affordable monthly payments. ​ The CARES Act, as extended by certain provisions of the Consolidated Appropriations Act of 2021, permits banks to suspend requirements under GAAP for loan modifications to borrowers affected by COVID-19 that may otherwise be characterized as troubled debt restructurings and suspend any determination related thereto if (i) the borrower was not more than 30 days past due as of December 31, 2019, (ii) the modifications are related to COVID-19, and (iii) the modification occurs between March 1, 2020 and the earlier of 60 days after the date of termination of the national emergency or January 1, 2022. ​ During 2022, the Company restructured four loans as TDR with an aggregate balance of $478,000, compared to one loan modified as TDR for $2.3 million during 2021. TDRs are classified as being in default on a case-by-case basis when they fail to be in compliance with the modified terms. There were no TDRs that defaulted during year 2022 and 2021. ​ As of December 31, 2022 and 2021, there were no commitments to lend additional funds to debtors whose terms have been modified in a TDR. ​ Loans to principal officers, directors, and their affiliates, which are made in the ordinary course of business, as of December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Beginning balance ​ $ 10,162 ​ $ 783 ​ New loans, including acquired related party loans ​ 267 ​ 11,836 ​ Repayments and other reductions ​ (1,946) ​ (2,457) ​ Change in related party status ​ - ​ - ​ Ending balance ​ $ 8,483 ​ $ 10,162 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2022
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 2022 2021 ​ 2020 Balance at beginning of period ​ $ 2,356 ​ $ 2,474 ​ $ 5,004 Property additions, net of acquisition adjustments ​ ​ 87 ​ ​ 5,748 ​ ​ 898 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and gains/losses ​ ​ 778 ​ ​ 5,787 ​ ​ 3,071 Period valuation write-down ​ ​ 104 ​ ​ 79 ​ ​ 357 Balance at end of period ​ $ 1,561 ​ $ 2,356 ​ $ 2,474 ​ ​ ​ Activity in the valuation allowance was as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2022 2021 2020 Balance at beginning of period ​ $ 1,179 ​ $ 1,643 ​ $ 6,712 Provision for unrealized losses ​ ​ 104 ​ ​ 79 ​ ​ 357 Reductions taken on sales ​ ​ (427) ​ ​ (543) ​ ​ (5,426) Balance at end of period ​ $ 856 ​ $ 1,179 ​ $ 1,643 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Expenses related to OREO, net of lease revenue includes: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2022 2021 ​ 2020 Gain on sales, net ​ $ (163) ​ $ (41) ​ $ (204) Provision for unrealized losses ​ ​ 104 ​ ​ 79 ​ ​ 357 Operating expenses ​ ​ 193 ​ ​ 133 ​ ​ 535 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 4 ​ ​ 4 ​ ​ 37 Net OREO expense ​ $ 130 ​ $ 167 ​ $ 651 ​

Premises and Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2022
Premises and Equipment
Premises and Equipment	Note 7: Premises and Equipment ​ Premises and equipment at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ ​ Land ​ $ 29,741 ​ $ - ​ $ 29,741 ​ $ 42,375 ​ $ - ​ $ 42,375 ​ ​ Buildings ​ 54,075 ​ 24,427 ​ 29,648 ​ 59,313 ​ 26,959 ​ 32,354 ​ ​ Leasehold improvements ​ 2,790 ​ 1,280 ​ 1,510 ​ 2,324 ​ 1,004 ​ 1,320 ​ ​ Furniture and equipment ​ 58,183 ​ 46,727 ​ 11,456 ​ 57,533 ​ 45,577 ​ 11,956 ​ ​ Total Premises and Equipment ​ $ 144,789 ​ $ 72,434 ​ $ 72,355 ​ $ 161,545 ​ $ 73,540 ​ $ 88,005 ​ ​ ​ At December 31, 2022, the Company had $4.6 million of fixed assets held for sale reported with other assets on the Consolidated Balance Sheets; no fixed assets were held for sale as of December 31, 2021.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2022
Deposits
Deposits	Note 8: Deposits ​ Major classifications of deposits at December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Noninterest bearing demand ​ $ 2,051,702 ​ $ 2,087,649 ​ Savings ​ ​ 1,145,592 ​ ​ 1,178,542 ​ NOW accounts ​ ​ 609,338 ​ ​ 593,259 ​ Money market accounts ​ ​ 862,170 ​ ​ 1,102,972 ​ Certificates of deposit of less than $100,000 ​ ​ 244,017 ​ ​ 296,298 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 157,438 ​ ​ 138,794 ​ Certificates of deposit of more than $250,000 ​ ​ 40,466 ​ ​ 68,718 ​ Total deposits ​ $ 5,110,723 ​ $ 5,466,232 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The Company had $37.0 million and $10.1 million in listing service deposits as of December 31, 2022 and 2021, respectively. Deposits held by senior officers and directors, including their related interests, totaled $13.8 million and $26.8 million as of December 31, 2022 and 2021, respectively. ​ At December 31, 2022, scheduled maturities of time deposits were as follows: ​ ​ ​ ​ ​ ​ 2023 $ 310,978 ​ 2024 ​ 71,879 ​ 2025 ​ 35,870 ​ 2026 ​ 17,191 ​ 2027 ​ 6,003 ​ Total time deposits ​ $ 441,921 ​ ​

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2022
Borrowings
Borrowings	Note 9: Borrowings ​ The following table is a summary of borrowings as of December 31, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Securities sold under repurchase agreements ​ $ 32,156 ​ $ 50,337 ​ Other short-term borrowings ​ ​ 90,000 ​ ​ - ​ Junior subordinated debentures 1 ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ 59,297 ​ ​ 59,212 ​ Senior notes ​ ​ 44,585 ​ ​ 44,480 ​ Notes payable and other borrowings ​ ​ 9,000 ​ ​ 19,074 ​ Total borrowings ​ $ 260,811 ​ $ 198,876 ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 $32.2 million and $50.3 million at December 31, 2022 and 2021, respectively. The fair value of the pledged collateral was $71.4 million and $113.0 million at December 31, 2022 and December 31, 2021, respectively. At December 31, 2022, 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, 2022, the Bank had $90.0 million in short-term advances outstanding under the FHLBC. There were no short-term advances as of December 31, 2021. 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, 2022 was valued at $5.6 million, and any potential FHLBC advances were collateralized by loans with a principal balance of $969.1 million. As of December 31, 2021, FHLBC stock owned by the Bank was valued at $7.1 million and the principal balance of loans pledged was $572.6 million. Based on the total amount of loans pledged, the Bank had a total borrowing capacity at the FHLBC of $603.1 million and a remaining funding availability of $513.1 million on December 31, 2022. ​ 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 $59.3 million and $59.2 million as of December 31, 2022 and 2021, respectively. ​ The Company also had $44.6 million and $44.5 million of senior notes outstanding, net of deferred issuance costs, as of December 31, 2022 and December 31, 2021, respectively. The senior notes were issued in December 2016 with a ten year maturity, and terms include 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 effective interest rate at December 31, 2022 was 8.62% . The notes are 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. As of December 31, 2022 and 2021, unamortized debt issuance costs related to the senior notes were $415,000 and $520,000 , respectively, and are included as a reduction of the balance of the senior notes on the Consolidated Balance Sheets. These deferred issuance costs will be amortized to interest expense over the ten year term of the notes and included in the Consolidated Statements of Income. ​ On February 24, 2020, the Company originated a $20.0 million term note, of which $9.0 million is outstanding as of December 31, 2022, with a correspondent bank, the proceeds of which were used in the redemption of the Company’s 7.80% cumulative trust preferred securities issued by Old Second Capital Trust I and related junior subordinated debentures. See the discussion in Note 10 – Junior Subordinated Debentures . The term note was issued for a three year term at one-month LIBOR plus 175 basis points, requires principal and interest payments quarterly, with no prepayment penalties; any remaining balances are due on February 24, 2023. The effective interest rate at December 31, 2022 was 6.14% . The balance of this note is included within Notes payable and other borrowings on the Consolidated Balance Sheets. 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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2022 ​ $ - - % $ 58,337 ​ 0.37 % 2023 ​ ​ 131,156 ​ 2.89 ​ ​ 9,000 1.85 ​ 2024 ​ - - ​ - - ​ 2025 ​ - - ​ - ​ - ​ 2026 ​ 44,585 6.02 ​ 46,554 5.88 ​ 2027 ​ - - ​ - ​ - ​ Thereafter ​ 85,070 3.91 ​ 84,985 3.89 ​ Total borrowings ​ $ 260,811 3.76 % $ 198,876 3.23 % ​

Junior Subordinated Debentures

Junior Subordinated Debentures	12 Months Ended
	Dec. 31, 2022
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, and now have a floating rate of 150 basis points over three-month 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 4.42% and 4.36% as of December 31, 2022 and 2021, 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, 2022 and 2021, the remaining unamortized debt issuance costs related to the junior subordinated debentures were $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, 2022
Income Taxes
Income Taxes	Note 11: Income Taxes ​ Income tax expense (benefit) for the years ending December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Current federal ​ $ 13,241 ​ $ 750 ​ $ 6,269 Current state ​ ​ 6,209 ​ ​ 594 ​ ​ 3,960 Deferred federal ​ ​ 3,338 ​ ​ 4,445 ​ ​ (135) Deferred state ​ ​ 1,356 ​ ​ 2,034 ​ ​ (511) Total income tax expense ​ $ 24,144 ​ $ 7,823 ​ $ 9,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following were the components of the deferred tax assets and liabilities as of December 31: ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Accrued bonus ​ $ 2,700 ​ $ 1,362 Allowance for credit losses ​ ​ 15,591 ​ ​ 14,636 Deferred compensation ​ ​ 1,292 ​ ​ 1,293 Goodwill amortization/impairment ​ ​ - ​ ​ 919 Stock based compensation ​ ​ 1,257 ​ ​ 911 Business combination adjustments ​ ​ 1,138 ​ ​ 882 Federal recognized built-in loss ("RBIL") carryforward ​ ​ - ​ ​ 493 Other assets ​ ​ 1,621 ​ ​ 1,173 Total deferred tax assets ​ ​ 23,599 ​ ​ 21,669 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (4,107) ​ ​ (1,636) Goodwill amortization/impairment ​ ​ (229) ​ ​ - Mortgage servicing rights ​ ​ (3,103) ​ ​ (1,982) Amortization of core deposit intangible ​ ​ (3,673) ​ ​ (4,269) Acquired securities ​ ​ (1,921) ​ ​ (2,458) Other liabilities ​ ​ (2,025) ​ ​ (1,814) Total deferred tax liabilities ​ ​ (15,058) ​ ​ (12,159) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 8,541 ​ ​ 9,510 Tax effect of adjustments related to other comprehensive income ​ ​ 36,209 ​ ​ (3,410) Net deferred tax asset ​ $ 44,750 ​ $ 6,100 ​ ​ ​ ​ ​ ​ ​ ​ At December 31, 2022, 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 for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Tax at statutory federal income tax rate ​ $ 19,225 ​ $ 5,852 ​ $ 7,856 Nontaxable interest income, net of disallowed interest deduction ​ ​ (1,097) ​ ​ (1,069) ​ ​ (1,067) BOLI income ​ ​ (151) ​ ​ (292) ​ ​ (271) State income taxes, net of federal benefit ​ ​ 6,091 ​ ​ 2,054 ​ ​ 2,570 Stock based compensation ​ ​ (43) ​ ​ 54 ​ ​ 297 Transaction costs ​ ​ - ​ ​ 396 ​ ​ - Other, net ​ ​ 119 ​ ​ 828 ​ ​ 198 Total tax at effective tax rate ​ $ 24,144 ​ $ 7,823 ​ $ 9,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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, 2022
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, 2022, 1,165,811 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 $3.0 million, $1.4 million and $2.1 million for the years ending December 31, 2022, 2021 and 2020 respectively. ​ There were 279,838 and 274,881 restricted stock units granted during the years ending December 31, 2022 and December 31, 2021, 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, 2022, is as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 540,306 ​ $ 12.04 Granted ​ 279,838 ​ ​ 14.29 Vested ​ (153,790) ​ ​ 12.73 Forfeited ​ (17,144) ​ ​ 12.49 Unvested at December 31 ​ 649,210 ​ $ 12.84 ​ ​ ​ ​ ​ ​ ​ Total unrecognized compensation cost of restricted stock unit awards was $3.9 million as of December 31, 2022, which is expected to be recognized over a weighted-average period of 1.86 years. ​

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2022
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): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,526,655 ​ ​ 30,208,663 ​ ​ 29,623,333 Net income ​ ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Basic earnings per share ​ ​ $ 1.51 ​ $ 0.66 ​ $ 0.94 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,526,655 ​ ​ 30,208,663 ​ ​ 29,623,333 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 686,433 ​ ​ 529,199 ​ ​ 550,739 Diluted average common shares outstanding ​ ​ ​ 45,213,088 ​ ​ 30,737,862 ​ ​ 30,174,072 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Diluted earnings per share ​ ​ $ 1.49 ​ $ 0.65 ​ $ 0.92 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments

Commitments	12 Months Ended
	Dec. 31, 2022
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, 2022 ​ December 31, 2021 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 3,514 ​ $ 15,365 ​ $ 18,879 ​ $ 384 ​ $ 17,474 ​ $ 17,858 ​ Performance standby ​ ​ 3,161 ​ ​ 13,989 ​ ​ 17,150 ​ ​ 456 ​ ​ 14,907 ​ ​ 15,363 ​ ​ ​ ​ 6,675 ​ ​ 29,354 ​ ​ 36,029 ​ ​ 840 ​ ​ 32,381 ​ ​ 33,221 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 6,675 ​ $ 29,421 ​ $ 36,096 ​ $ 840 ​ $ 32,448 ​ $ 33,288 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 139,070 ​ $ 860,255 ​ $ 999,325 ​ $ 84,225 ​ $ 895,665 ​ $ 979,890 ​ ​ 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, 2022, aggregate future minimum rental income to be received under noncancelable leases totaled $572,000. Total facility net operating lease expense or revenue recorded under all operating leases was a net expense of $396,000 in 2022, $361,000 in 2021, and $223,000 in 2020. Total ATM lease expense, including the costs related to servicing those ATM’s, was $1.9 million in 2022, $1.2 million in 2021, and $1.0 million in 2020. ​ ​ The following table below is the estimated aggregate minimum annual rental commitments at December 31, 2022: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2028 ​ 2023 ​ 2024 ​ 2025 ​ 2026 ​ 2027 ​ and thereafter Rental commitment $ 1,460 ​ $ 1,543 ​ $ 1,792 ​ $ 1,595 ​ $ 1,631 ​ $ 10,036 ​ 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, 2022
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, 2022, and December 31, 2021. ​ 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 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 ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 394,421 ​ 9.46 % ​ $ 291,855 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 290,487 ​ 7.00 ​ ​ $ 269,738 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 522,932 ​ 12.55 ​ ​ ​ 437,513 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 558,503 ​ 13.46 ​ ​ ​ 435,682 ​ 10.50 ​ ​ ​ 414,935 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 10.06 ​ ​ ​ 354,382 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 352,734 ​ 8.50 ​ ​ ​ 331,985 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 7.81 ​ ​ ​ 214,812 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 9.58 ​ ​ ​ 215,028 ​ 4.00 ​ ​ ​ 268,785 ​ 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, 2022, the capital measures of the Company exclude $2.9 million, which is the Day 1 impact to retained earnings and 25% 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, 2022, the Company had total dividend availability of $18.5 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, 2022
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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 2,750 ​ $ 20,000 ​ Fair value ​ 20 ​ 17 ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 2,548 ​ $ 14,414 ​ Fair value ​ 56 ​ 491 ​ ​ Fair values were estimated based on changes in mortgage interest rates from the date of the commitments. The Company sold $76.6 million in loans to investors receiving proceeds of $81.8 million and resulting in a gain on sale of $2.0 million for the year ended December 31, 2022. Sales to investors included $62.4 million, or 76.5% to FNMA and $7.9 million, or 9.7%, to FHLMC for the year ended December 31, 2022. 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, 2022
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. ​ At 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. There were no transfers between levels at December 31, 2021. ​ 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 impaired 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, 2022 measured by the Company at fair value on a recurring basis are as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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, including risk participation agreement ​ ​ - ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,339 ​ $ - ​ $ - ​ $ 202,339 U.S. government agencies ​ ​ - ​ ​ 61,888 ​ ​ - ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 172,302 ​ ​ - ​ ​ 172,302 States and political subdivisions ​ ​ - ​ ​ 242,373 ​ ​ 15,236 ​ ​ 257,609 Corporate bonds ​ ​ - ​ ​ 9,887 ​ ​ - ​ ​ 9,887 Collateralized mortgage obligations ​ ​ - ​ ​ 672,967 ​ ​ - ​ ​ 672,967 Asset-backed securities ​ ​ - ​ ​ 236,877 ​ ​ - ​ ​ 236,877 Collateralized loan obligations ​ ​ - ​ ​ 79,763 ​ ​ - ​ ​ 79,763 Loans held-for-sale ​ ​ - ​ ​ 4,737 ​ ​ - ​ ​ 4,737 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 7,097 ​ ​ 7,097 Interest rate swap agreements ​ ​ - ​ ​ 3,494 ​ ​ - ​ ​ 3,494 Mortgage banking derivatives ​ ​ - ​ ​ 508 ​ ​ - ​ ​ 508 Total ​ $ 202,339 ​ $ 1,484,796 ​ $ 22,333 ​ $ 1,709,468 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 Total ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 ​ The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are as follows: ​ ​ worked ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 loss ​ ​ - ​ - ​ (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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2021 ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ ​ Asset-backed Mortgage Political ​ Servicing ​ ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2021 ​ $ - $ - $ 4,319 ​ $ 4,224 ​ Transfers into Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Transfers out of Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ - ​ - ​ (20) ​ ​ 2,420 ​ Included in other comprehensive income ​ ​ - ​ - ​ 801 ​ ​ - ​ Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 11,063 ​ ​ - ​ Issuances ​ ​ - ​ - ​ - ​ ​ 1,612 ​ Settlements ​ ​ - ​ - ​ (927) ​ ​ (1,159) ​ Ending balance December 31, 2021 ​ $ - $ - $ 15,236 ​ $ 7,097 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ 15,236 ​ Discounted Cash Flow ​ Discount Rate ​ 0.6 - 3.5% ​ 2.8 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.3 - 2.4% ​ 0.6 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 7,097 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 0.0 - 36.6% ​ 11.9 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 impaired loans and OREO. For assets measured at fair value on a nonrecurring basis at December 31, 2022 the following tables provide the level of valuation assumptions used to determine each valuation and the carrying value of the related assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 13,138 ​ $ 13,138 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,356 ​ ​ 2,356 Total ​ $ - ​ $ - ​ $ 15,494 ​ $ 15,494 ​ 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, had a carrying amount of $18.5 million and a valuation allowance of $5.4 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $2.7 million for the year ending December 31, 2021. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.4 million, which is made up of the outstanding balance of $3.7 million, net of a valuation allowance of $1.2 million and purchase accounting adjustments of $131,000 at December 31, 2021. ​ These OREO and impaired 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, 2022
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, 2022 and 2021, 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, 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 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 38,565 ​ $ 38,565 ​ $ 38,565 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 713,542 ​ ​ 713,542 ​ ​ 713,542 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,693,632 ​ ​ 1,693,632 ​ ​ 202,339 ​ ​ 1,476,057 ​ ​ 15,236 FHLBC and FRBC stock ​ ​ 13,257 ​ ​ 13,257 ​ ​ - ​ ​ 13,257 ​ ​ - Loans held-for-sale ​ ​ 4,737 ​ ​ 4,737 ​ ​ - ​ ​ 4,737 ​ ​ - Net loans ​ ​ 3,376,523 ​ ​ 3,407,596 ​ ​ - ​ ​ - ​ ​ 3,407,596 Mortgage servicing rights ​ ​ 7,097 ​ ​ 7,097 ​ ​ - ​ ​ - ​ ​ 7,097 Interest rate swap agreements ​ ​ 3,494 ​ ​ 3,494 ​ ​ - ​ ​ 3,494 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 508 ​ ​ 508 ​ ​ - ​ ​ 508 ​ ​ - Interest receivable on securities and loans ​ ​ 13,431 ​ ​ 13,431 ​ ​ - ​ ​ 13,431 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 2,087,649 ​ $ 2,087,649 ​ $ 2,087,649 ​ $ - ​ $ - Interest bearing deposits ​ ​ 3,378,583 ​ ​ 3,375,930 ​ ​ - ​ ​ 3,375,930 ​ ​ - Securities sold under repurchase agreements ​ ​ 50,337 ​ ​ 50,337 ​ ​ - ​ ​ 50,337 ​ ​ - Other short-term borrowings ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 18,557 ​ ​ - ​ ​ 18,557 ​ ​ - Subordinated debentures ​ ​ 59,212 ​ ​ 60,111 ​ ​ ​ ​ ​ 60,111 ​ ​ ​ Senior notes ​ ​ 44,480 ​ ​ 44,480 ​ ​ 44,480 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 19,074 ​ ​ 19,411 ​ ​ - ​ ​ 19,411 ​ ​ - Interest rate swap agreements ​ ​ 6,788 ​ ​ 6,788 ​ ​ - ​ ​ 6,788 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,706 ​ ​ 1,706 ​ ​ - ​ ​ 1,706 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions	12 Months Ended
	Dec. 31, 2022
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 $250.0 million and $50.0 million as of December 31, 2022 and 2021, 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, 2022 and 2021, 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 $5.2 million will be reclassified as an increase to interest income and an additional $563,000 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, 2022 and 2021 were $110.6 million and $165.0 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, 2022 and 2021, the Company had $11.2 million of cash collateral pledged with two correspondent financial institutions and $17.2 million of cash collateral pledged with one correspondent financial institution, respectively. The Company held $5.3 million and $180,000 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 2022 or 2021. 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, 2022 and 2021 were $5.3 million and $34.4 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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 808 ​ Other Liabilities 4,102 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 808 ​ ​ 4,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 26 ​ 165,005 ​ Other Assets 2,686 ​ Other Liabilities 2,686 Interest rate lock commitments and forward contracts 87 ​ 34,414 ​ Other Assets 508 ​ Other Liabilities - Other contracts 3 ​ 17,173 ​ Other Assets - ​ Other Liabilities 21 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,194 ​ ​ 2,707 ​ 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 $4.2 million, $2.4 million, and $2.7 million as of December 31, 2022, 2021, and 2020, respectively. The amount of the loss reclassified from AOCI to interest expense on the income statement totaled $373,000 for the year ended December 31, 2022 and the gain reclassified from AOCI to interest income was $56,000 and $57,000 for the years ended December 31, 2021 and 2020, respectively. ​ 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, 2022
Preferred Stock.
Preferred Stock	​ Note 20: Preferred Stock ​ Preferred stock of 300,000 shares is authorized but unissued as of December 31, 2022 and 2021. ​ ​

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
	Dec. 31, 2022
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: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 39,167 ​ $ 25,112 ​ Investment in subsidiaries ​ 555,140 ​ 626,325 ​ Other assets ​ 6,526 ​ 1,111 ​ Total assets ​ $ 600,833 ​ $ 652,548 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,297 ​ 59,212 ​ Senior notes ​ ​ 44,585 ​ ​ 44,480 ​ Notes payable ​ ​ 9,000 ​ ​ 13,000 ​ Other liabilities ​ 1,037 ​ 8,056 ​ Stockholders’ equity ​ 461,141 ​ 502,027 ​ Total liabilities and stockholders' equity ​ $ 600,833 ​ $ 652,548 ​ ​ Condensed Statements of Income for the years ended December 31 were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 40,000 ​ $ 40,000 ​ $ 41,300 Other income ​ 29 ​ 15 ​ 32 Total operating income ​ 40,029 ​ 40,015 ​ 41,332 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,136 ​ 1,133 ​ 2,216 Subordinated debt ​ ​ 2,185 ​ ​ 1,610 ​ ​ - Senior notes ​ ​ 2,682 ​ ​ 2,692 ​ ​ 2,693 Notes payable ​ 385 ​ 291 ​ 362 Other expenses ​ 5,086 ​ 6,918 ​ 3,669 Total operating expense ​ 11,474 ​ 12,644 ​ 8,940 Income before income taxes and equity in undistributed net income of subsidiaries ​ 28,555 ​ 27,371 ​ 32,392 Income tax benefit ​ (3,216) ​ (2,986) ​ (2,215) Income before equity in undistributed net income of subsidiaries ​ 31,771 ​ 30,357 ​ 34,607 Equity in undistributed net income of subsidiaries ​ 35,634 ​ (10,313) ​ (6,782) Net income available to common stockholders ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 ​ ​ Condensed Statements of Cash Flows for the years ended December 31, were as follows: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ (35,634) ​ 10,313 ​ 6,782 Provision for deferred tax expense (benefit) ​ 91 ​ (248) ​ (514) Change in taxes payable ​ (4,694) ​ (695) ​ 5,933 Change in other assets ​ 12 ​ (12) ​ 954 Stock-based compensation ​ 2,960 ​ 1,435 ​ 2,089 Other, net ​ (2,753) ​ 961 ​ 682 Net cash provided by operating activities ​ 27,387 ​ 31,798 ​ 43,751 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ (8,877) ​ ​ (4,612) ​ ​ (1,186) Purchases of treasury stock ​ (455) ​ (10,417) ​ (5,922) Redemption of junior subordinated debentures ​ ​ - ​ ​ - ​ ​ (32,604) Issuance of term note ​ ​ - ​ ​ - ​ ​ 20,000 Issuance of sub debt ​ ​ - ​ ​ 59,148 ​ ​ - Repayment of term note ​ ​ (4,000) ​ ​ (4,000) ​ ​ (3,000) Net cash (used in) provided by financing activities ​ (13,332) ​ 40,119 ​ (22,712) Net change in cash and cash equivalents ​ 14,055 ​ (22,489) ​ 21,039 Cash and cash equivalents at beginning of year ​ 25,112 ​ 47,601 ​ 26,562 Cash and cash equivalents at end of year ​ $ 39,167 ​ $ 25,112 ​ $ 47,601 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2022
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, 2022, 2021 and 2020, 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, 2022, 2021 and 2020. ​ The total expense relating to the 401(k) Plan was approximately $2.0 million in 2022, $1.4 million in 2021 and $1.2 million in 2020. ​ 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, 2022, 2021 and 2020 are included in other liabilities.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
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 Melrose Holdings LLC and Station I, LLC, both of which hold 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 2022 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 – For purposes of the Consolidated Statements of Cash Flows, management has defined cash and cash equivalents to include cash and due from banks, interest-earning deposits in other financial institutions, and other short-term investments, such as federal funds sold and securities purchased under agreements to resell. The classification of cash and cash equivalents includes those assets held in the form of cash or liquid instruments with an original maturity of 90 days or less. ​
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 ​
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. ​ Troubled Debt Restructurings (“TDRs”) ​ A restructuring of debt is considered a TDR when (i) the borrower is experiencing financial difficulties and (ii) the creditor grants a concession, such as forgiveness of principal, reduction of the interest rate, changes in payments, or extension of the maturity, that it would not otherwise consider. Loans are not classified as TDRs when the modification is short-term or results in only an insignificant delay or shortfall in the payments to be received. The Company’s TDRs are determined on a case-by-case basis in connection with ongoing loan collection processes. ​ The Company does not accrue interest on any TDRs unless it believes collection of all principal and interest under the modified terms is reasonably assured. For TDRs to accrue interest, the borrower must demonstrate both some level of past performance and the capacity to perform under the modified terms. Generally, six months of consecutive payment performance by the borrower under the restructured terms is required before TDRs are returned to accrual status. However, the period could vary depending on the individual facts and circumstances of the loan. An evaluation of the borrower’s current creditworthiness is used to assess whether the borrower has the capacity to repay the loan under the modified terms. This evaluation includes an estimate of expected cash flows, evidence of strong financial position, and estimates of the value of collateral, if applicable. ​ 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 unless the Company has identified an expected troubled debt restructuring. ​ 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 – Premises, furniture, equipment, and leasehold improvements are stated at cost less accumulated depreciation and amortization. Depreciation expense is determined by the straight-line method over the estimated useful lives of the assets. Leasehold improvements are amortized on a straight-line basis over the shorter of the life of the asset or the lease term including anticipated renewals. Rates of depreciation are generally based on the following useful lives: buildings, 25 to 40 years ; building improvements, 3 to 15 years or longer under limited circumstances; and furniture and equipment, 3 to 10 years . Gains and losses on dispositions are included in other noninterest expense in the Consolidated Statements of Income. Maintenance and repairs are charged to operating expenses as incurred, while improvements that conform to definitions of tangible property improvements are capitalized and depreciated over the estimated remaining life. ​ 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 $771.4 million and $801.9 million at December 31, 2022, and 2021, 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 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, and 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 quantitative assessment of goodwill as of November 30, 2022 which resulted in the fair value of the Company exceeding the carrying value; therefore, it was determined goodwill was not impaired at December 31, 2022. The quantitative assessment was performed as a matter of periodic practice rather than as a response to a qualitative assessment. On November 30, 2021, the Company performed a qualitative assessment of goodwill from which we concluded it was more likely than not that goodwill was not impaired as of December 31, 2021. ​ The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2022, CDI totaled $13.7 million compared to $16.3 million at December 31, 2021. The total CDI amount reflects the acquisition of West Suburban in 2021 as well as ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $2.6 million, $644,000 , and $494,000 was recorded in 2022, 2021, and 2020, respectively. The expected future annual amortization expense for each of the next five years (2023-2027) is approximately $2.5 million, $2.3 million, $2.1 million, $1.8 million, and $1.6 million, respectively.
Debt Issuance Costs	Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheets as a direct reduction from the carrying value of that debt liability. The deferred issuance costs are amortized over the life the related debt instrument, and included within the debt’s interest expense.
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, 2022 and 2021 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, 2022 or 2021. The Company is currently open to audit under the statute of limitations for Federal taxes from 2019 to 2021 and various state jurisdictions from 2017 to 2021. ​
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 has developed a project plan to assess the use of alternative indexes and to seek to ensure all financial instruments that reference LIBOR are identified, quantified, and researched for the LIBOR fallback language available or needed. The Company has completed the ISDA protocol adherence for LIBOR fallback language for all commercial swaps, has met with its commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by Old Second National Bank (the “Bank”) for new loans to ensure appropriate fallback language is included. We have 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 have been updated to handle multiple SOFR-based indexes and we continue to meet regularly to plan for the transition of existing LIBOR exposures prior to the final LIBOR cessation date of June 30, 2023. ​ ASU 2022-01 Derivatives and Hedging (Topic 815): Fair Value Hedging – Portfolio Layer Method ​ The Company is currently reviewing ASU 2022-01 for the impact to derivative measurement and disclosures, and will assess any revisions needed for reporting purposes in the next quarter. The Company anticipates adopting ASU 2022-01 no later than January 1, 2023. The Company does not expect a material impact upon adoption. ​ ASU 2022-02 Financial Instruments-Credit Losses (Topic 326): Troubled Debt Restructurings and Vintage Disclosures ​ The Company is currently reviewing ASU 2022-02 for the impact to TDR recognition, measurement and disclosures, and will assess any revisions needed for reporting purposes in the next quarter. The Company anticipates adopting ASU 2022-02 as of January 1, 2023. ​
Subsequent Events	Subsequent Events ​ On January 17, 2023, the Company’s Board of Directors declared a cash dividend of $0.05 per share payable on February 6, 2023, to stockholders of record as of January 27, 2023.
Mortgage Banking Derivatives.
Summary of Significant Accounting Policies
Derivative Financial Instruments	Mortgage Banking Derivatives . ​
Commercial
Summary of Significant Accounting Policies
Loans	Commercial loans – Such credits typically comprise working capital loans, loans for physical asset expansion, asset acquisition loans and other commercial and industrial business loans. Loans to closely held businesses will generally be guaranteed in full or for a meaningful amount by the businesses’ major owners. Commercial loans are made based primarily on the historical and projected cash flow of the borrower and secondarily on the underlying collateral provided by the borrower. The cash flows of borrowers, however, may not behave as forecasted and collateral securing loans may fluctuate in value due to economic or individual performance factors. Minimum standards and underwriting guidelines have been established for all commercial loan types. The Company classifies five different risk levels for this segment to assign a loss rate based on historical losses, and also performs an analysis using expectations for the weighted risk rating trends to run a regression analysis to a severe loss scenario to determine adjustments needed within the special mention and substandard sub-segments
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 sponsored compared to owner occupied.
Real estate - residential loans
Summary of Significant Accounting Policies
Loans	Real estate - residential loans ● Residential owner-occupied – 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 – 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 – 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 analysis for construction, residential investor, residential owner occupied and the HELOC segments; and (iii) a WARM (weighted average remaining life) 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 – The Company defines real estate - construction loans as loans where the loan proceeds are controlled by the Company and used exclusively for the improvement or development of real estate in which the Company holds a mortgage. Due to the inherent risk in this type of loan, they are subject to other industry specific policy guidelines outlined in the Company’s Credit Risk Policy and are monitored closely. The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections.

Acquisition (Tables)

Acquisition (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 ​ ​ As of December 31, 2021 ​ ​ PCD ​ Non-PCD ​ Total ​ ​ PCD ​ Non-PCD ​ Total West Suburban acquired loans ​ $ 75,396 ​ $ 1,059,363 ​ $ 1,134,759 ​ ​ $ 102,409 ​ $ 1,418,752 ​ $ 1,521,161 ABC Bank acquired loans ​ ​ 1,786 ​ ​ 31,895 ​ ​ 33,681 ​ ​ ​ 4,547 ​ ​ 64,236 ​ ​ 68,783 Talmer Bank acquired loans ​ ​ - ​ ​ 15,693 ​ ​ 15,693 ​ ​ ​ - ​ ​ 45,858 ​ ​ 45,858 Total acquired loans net book value ​ $ 77,182 ​ $ 1,106,951 ​ $ 1,184,133 ​ ​ $ 106,956 ​ $ 1,528,846 ​ $ 1,635,802 Accretion recorded on acquired loans year to date ​ $ 848 ​ $ 4,726 ​ $ 5,574 ​ ​ $ 401 ​ $ 565 ​ $ 966 Accretion recorded on acquired unfunded commitments year to date ​ ​ ​ ​ ​ ​ ​ $ 893 ​ ​ ​ ​ ​ ​ ​ ​ $ 74 ​

Securities (Tables)

Securities (Tables)	12 Months Ended
	Dec. 31, 2022
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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Gross ​ Gross ​ ​ ​ ​ ​ Amortized ​ Unrealized ​ Unrealized ​ Fair December 31, 2021 Cost 1 Gains Losses ​ Value Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,251 ​ $ 125 ​ $ (37) ​ $ 202,339 U.S. government agencies ​ ​ 62,587 ​ ​ - ​ ​ (699) ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ 172,016 ​ ​ 856 ​ ​ (570) ​ ​ 172,302 States and political subdivisions ​ ​ 241,937 ​ ​ 16,344 ​ ​ (672) ​ ​ 257,609 Corporate bonds ​ ​ 10,000 ​ ​ - ​ ​ (113) ​ ​ 9,887 Collateralized mortgage obligations ​ ​ 673,238 ​ ​ 2,014 ​ ​ (2,285) ​ ​ 672,967 Asset-backed securities ​ ​ 236,293 ​ ​ 1,245 ​ ​ (661) ​ ​ 236,877 Collateralized loan obligations ​ ​ 79,838 ​ ​ 3 ​ ​ (78) ​ ​ 79,763 Total securities available-for-sale ​ $ 1,678,160 ​ $ 20,587 ​ $ (5,115) ​ $ 1,693,632 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Excludes interest receivable of $6.8 million and $4.3 million at December 31, 2022 and December 31, 2021, respectively, that is recorded in other assets on the consolidated balance sheet. ​
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 ​ $ 62,369 ​ 0.69 % ​ $ 60,279 ​ Due after one year through five years ​ ​ 247,711 ​ 1.14 ​ ​ ​ 231,925 ​ Due after five years through ten years ​ ​ 43,941 ​ 2.75 ​ ​ ​ 39,785 ​ Due after ten years ​ ​ 181,210 ​ 3.04 ​ ​ ​ 171,938 ​ ​ ​ ​ 535,231 ​ 1.86 ​ ​ ​ 503,927 ​ Mortgage-backed and collateralized mortgage obligations ​ ​ 736,924 ​ 2.53 ​ ​ ​ 658,758 ​ Asset-backed securities ​ ​ 210,388 ​ 4.77 ​ ​ ​ 201,928 ​ Collateralized loan obligations ​ ​ 180,276 ​ 6.21 ​ ​ ​ 174,746 ​ Total securities available-for-sale ​ $ 1,662,819 ​ 3.00 % ​ $ 1,539,359 ​ ​
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, 2022 and 2021, 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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Less than 12 months ​ 12 months or more ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ 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 ​ $ 37 ​ $ 49,719 ​ - ​ $ - ​ $ - ​ 1 ​ $ 37 ​ $ 49,719 U.S. government agencies ​ 5 ​ ​ 592 ​ ​ 56,879 ​ 4 ​ ​ 107 ​ ​ 5,008 ​ 9 ​ ​ 699 ​ ​ 61,887 U.S. government agencies mortgage-backed ​ 63 ​ ​ 505 ​ ​ 78,711 ​ 1 ​ ​ 65 ​ ​ 1,663 ​ 64 ​ ​ 570 ​ ​ 80,374 States and political subdivisions ​ 7 ​ ​ 55 ​ ​ 8,430 ​ 1 ​ ​ 617 ​ ​ 4,051 ​ 8 ​ ​ 672 ​ ​ 12,481 Corporate bonds ​ 2 ​ ​ 113 ​ ​ 9,887 ​ - ​ ​ - ​ ​ - ​ 2 ​ ​ 113 ​ ​ 9,887 Collateralized mortgage obligations ​ 133 ​ ​ 2,285 ​ ​ 381,658 ​ - ​ ​ - ​ ​ - ​ 133 ​ ​ 2,285 ​ ​ 381,658 Asset-backed securities ​ 20 ​ ​ 608 ​ ​ 103,819 ​ 3 ​ ​ 53 ​ ​ 3,276 ​ 23 ​ ​ 661 ​ ​ 107,095 Collateralized loan obligations ​ 10 ​ ​ 35 ​ ​ 45,132 ​ 2 ​ ​ 43 ​ ​ 10,628 ​ 12 ​ ​ 78 ​ ​ 55,760 Total securities available-for-sale ​ 241 ​ $ 4,230 ​ $ 734,235 ​ 11 ​ $ 885 ​ $ 24,626 ​ 252 ​ $ 5,115 ​ $ 758,861 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of proceeds from sale and gross realized gains and losses on sale of securities	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended ​ ​ ​ ​ December 31, ​ Securities available-for-sale 2022 2021 2020 ​ Proceeds from sales of securities ​ ​ $ 30,981 ​ $ 605,846 ​ $ 18,006 ​ Gross realized gains on securities ​ ​ - ​ 270 ​ 17 ​ Gross realized losses on securities ​ ​ (944) ​ (38) ​ (42) ​ Net realized (losses) gains ​ ​ $ (944) ​ $ 232 ​ $ (25) ​ Income tax benefit (expense) on net realized (losses) gains ​ ​ $ 265 ​ $ (65) ​ $ 7 ​ Effective tax rate applied ​ ​ ​ 28.1 % ​ 28.0 % ​ 28.0 %

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	12 Months Ended
	Dec. 31, 2022
Loans and Allowance for Credit Losses on Loans
Schedule of major classifications of loans	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 December 31, 2021 Commercial 1 ​ $ 840,964 ​ $ 771,474 Leases ​ ​ 277,385 ​ ​ 176,031 Commercial real estate – investor ​ ​ 987,635 ​ ​ 799,928 Commercial real estate – owner occupied ​ ​ 854,879 ​ ​ 731,845 Construction ​ ​ 180,535 ​ ​ 206,132 Residential real estate – investor ​ ​ 57,353 ​ ​ 63,399 Residential real estate – owner occupied ​ ​ 219,718 ​ ​ 213,248 Multifamily ​ ​ 323,691 ​ ​ 309,164 HELOC ​ ​ 109,202 ​ ​ 126,290 Other 2 ​ ​ 18,247 ​ ​ 23,293 Total loans ​ ​ 3,869,609 ​ ​ 3,420,804 Allowance for credit losses on loans ​ ​ (49,480) ​ ​ (44,281) Net loans 3 ​ $ 3,820,129 ​ $ 3,376,523 ​ 1 Includes $1.6 million and $38.4 million of PPP loans outstanding at December 31, 2022 and 2021, respectively. ​ 2 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. ​ 3 Excludes accrued interest receivable of $15.9 million and $9.2 million at December 31, 2022 and December 31, 2021, respectively, which is recorded in other assets on the consolidated balance sheet. ​
Schedule of changes in the allowance for loan losses by segment of loans based on method of impairment	​ ​ The following table represent the activity in the ACL for loans for the year ended December 31, 2022, 2021 and 2020: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ Provision for ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ (Release of) ​ ​ ​ ​ ​ Balance Allowance for credit losses 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 Allowance for credit losses ​ Balance ​ WSB Acquisition ​ (Release of) ​ ​ ​ ​ ​ Balance ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Beginning ​ ​ Impact of Provision ​ ​ ​ ​ ​ Ending ​ ​ Balance ​ ​ Adopting for Loan ​ ​ ​ ​ ​ Balance Allowance for loan and lease losses: January 1, 2020 ​ ASC 326 Losses Charge-offs Recoveries December 31, 2020 Commercial ​ $ 3,015 ​ ​ (292) ​ $ 72 ​ $ 39 ​ $ 56 ​ $ 2,812 Leases ​ ​ 1,262 ​ ​ 501 ​ ​ 2,233 ​ ​ 206 ​ ​ 98 ​ ​ 3,888 Commercial real estate – Investor ​ ​ 6,218 ​ ​ (741) ​ ​ 2,769 ​ ​ 512 ​ ​ 165 ​ ​ 7,899 Commercial real estate – Owner occupied ​ ​ 3,678 ​ ​ (848) ​ ​ 1,793 ​ ​ 1,763 ​ ​ 697 ​ ​ 3,557 Construction ​ ​ 513 ​ ​ 1,334 ​ ​ 2,095 ​ ​ 60 ​ ​ 172 ​ ​ 4,054 Residential real estate – Investor ​ ​ 601 ​ ​ 740 ​ ​ 350 ​ ​ 8 ​ ​ 57 ​ ​ 1,740 Residential real estate – Owner occupied ​ ​ 1,257 ​ ​ 1,320 ​ ​ (107) ​ ​ 43 ​ ​ 287 ​ ​ 2,714 Multifamily ​ ​ 1,444 ​ ​ 1,732 ​ ​ 449 ​ ​ - ​ ​ - ​ ​ 3,625 HELOC ​ ​ 1,161 ​ ​ 1,526 ​ ​ (933) ​ ​ 193 ​ ​ 387 ​ ​ 1,948 Other ​ ​ 640 ​ ​ 607 ​ ​ 445 ​ ​ 244 ​ ​ 170 ​ ​ 1,618 Total ​ $ 19,789 ​ $ 5,879 ​ $ 9,166 ​ $ 3,068 ​ $ 2,089 ​ $ 33,855 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of collateral dependent loans and related loan allowances.	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Accounts ​ ​ ​ ​ ​ ​ ​ ACL December 31, 2021 ​ Real Estate ​ Receivable ​ Equipment ​ Other ​ Total ​ Allocation Commercial ​ $ 1,986 ​ $ 9,901 ​ $ - ​ $ - ​ $ 11,887 ​ $ 2,677 Leases ​ ​ - ​ ​ - ​ ​ 3,249 ​ ​ 505 ​ ​ 3,754 ​ ​ 811 Commercial real estate – investor ​ ​ 5,693 ​ ​ - ​ ​ - ​ ​ - ​ ​ 5,693 ​ ​ - Commercial real estate – owner occupied ​ ​ 9,147 ​ ​ - ​ ​ - ​ ​ 2,490 ​ ​ 11,637 ​ ​ 362 Construction ​ ​ 2,104 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 ​ ​ 992 Residential real estate – investor ​ ​ 925 ​ ​ - ​ ​ - ​ ​ - ​ ​ 925 ​ ​ - Residential real estate – owner occupied ​ ​ 4,271 ​ ​ - ​ ​ - ​ ​ - ​ ​ 4,271 ​ ​ 276 Multifamily ​ ​ 1,845 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,845 ​ ​ 75 HELOC ​ ​ 1,006 ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,006 ​ ​ 190 Other ​ ​ - ​ ​ - ​ ​ - ​ ​ 7 ​ ​ 7 ​ ​ 4 Total ​ $ 26,977 ​ $ 9,901 ​ $ 3,249 ​ $ 3,002 ​ $ 43,129 ​ $ 5,387 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 90 days or ​ ​ ​ ​ ​ ​ ​ ​ 90 Days or ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Greater Past ​ ​ 30-59 Days ​ 60-89 Days ​ Greater Past ​ Total Past ​ ​ ​ ​ ​ ​ ​ Due and December 31, 2021 1 ​ Past Due Past Due Due Due Current Total Loans Accruing Commercial ​ $ 3,407 ​ $ 1,413 ​ $ 1,828 ​ $ 6,648 ​ $ 764,826 ​ $ 771,474 ​ $ 1,396 Leases ​ ​ 125 ​ ​ - ​ ​ 1,571 ​ ​ 1,696 ​ ​ 174,335 ​ ​ 176,031 ​ ​ - Commercial real estate – investor ​ ​ - ​ ​ 267 ​ ​ 1,107 ​ ​ 1,374 ​ ​ 798,554 ​ ​ 799,928 ​ ​ - Commercial real estate – owner occupied ​ ​ 2,324 ​ ​ 500 ​ ​ 4,848 ​ ​ 7,672 ​ ​ 724,173 ​ ​ 731,845 ​ ​ 1,594 Construction ​ ​ 854 ​ ​ - ​ ​ - ​ ​ 854 ​ ​ 205,278 ​ ​ 206,132 ​ ​ - Residential real estate – investor ​ ​ 395 ​ ​ 470 ​ ​ 792 ​ ​ 1,657 ​ ​ 61,742 ​ ​ 63,399 ​ ​ 23 Residential real estate – owner occupied ​ ​ 1,994 ​ ​ 591 ​ ​ 3,077 ​ ​ 5,662 ​ ​ 207,586 ​ ​ 213,248 ​ ​ 97 Multifamily ​ ​ - ​ ​ 1,046 ​ ​ - ​ ​ 1,046 ​ ​ 308,118 ​ ​ 309,164 ​ ​ - HELOC ​ ​ 193 ​ ​ 23 ​ ​ 398 ​ ​ 614 ​ ​ 125,676 ​ ​ 126,290 ​ ​ - Other ​ ​ 50 ​ ​ 46 ​ ​ 23 ​ ​ 119 ​ ​ 23,174 ​ ​ 23,293 ​ ​ - Total ​ $ 9,342 ​ $ 4,356 ​ $ 13,644 ​ $ 27,342 ​ $ 3,393,462 ​ $ 3,420,804 ​ $ 3,110 ​ 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. ​
Schedule of loans on nonaccrual for which there was no related allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Nonaccrual loan detail December 31, 2022 With no ACL December 31, 2021 With no ACL Commercial ​ $ 7,189 ​ $ 6,598 ​ $ 11,894 ​ $ 9,217 Leases ​ ​ 1,876 ​ ​ - ​ ​ 3,754 ​ ​ 2,943 Commercial real estate – investor ​ ​ 4,346 ​ ​ 4,244 ​ ​ 5,694 ​ ​ 5,694 Commercial real estate – owner occupied ​ ​ 8,050 ​ ​ 3,813 ​ ​ 11,637 ​ ​ 11,205 Construction ​ ​ 251 ​ ​ - ​ ​ 160 ​ ​ 160 Residential real estate – investor ​ ​ 1,528 ​ ​ 675 ​ ​ 876 ​ ​ 876 Residential real estate – owner occupied ​ ​ 3,713 ​ ​ 1,572 ​ ​ 4,898 ​ ​ 4,622 Multifamily ​ ​ 2,538 ​ ​ 1,322 ​ ​ 1,573 ​ ​ 1,573 HELOC ​ ​ 2,109 ​ ​ 180 ​ ​ 1,042 ​ ​ 852 Other ​ ​ 2 ​ ​ - ​ ​ 3 ​ ​ 3 Total ​ $ 31,602 ​ $ 18,404 ​ $ 41,531 ​ $ 37,145 ​
Schedule of credit quality indicators by class of loans	​ ​ 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 ​ $ 225,056 ​ $ 70,608 ​ $ 21,597 ​ $ 12,742 ​ $ 6,957 ​ $ 2,651 ​ $ 447,821 ​ $ - ​ $ 787,432 Special Mention ​ ​ 1,875 ​ ​ 272 ​ ​ 1,182 ​ ​ 2,432 ​ ​ - ​ ​ - ​ ​ 21,286 ​ ​ - ​ ​ 27,047 Substandard ​ ​ 4,958 ​ ​ 2,447 ​ ​ 2,981 ​ ​ 12,176 ​ ​ 7 ​ ​ - ​ ​ 3,916 ​ ​ - ​ ​ 26,485 Total commercial ​ ​ 231,889 ​ ​ 73,327 ​ ​ 25,760 ​ ​ 27,350 ​ ​ 6,964 ​ ​ 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 ​ ​ 416,094 ​ ​ 228,686 ​ ​ 118,491 ​ ​ 63,845 ​ ​ 46,935 ​ ​ 46,406 ​ ​ 7,113 ​ ​ - ​ ​ 927,570 Special Mention ​ ​ 5,349 ​ ​ 1,417 ​ ​ 5,490 ​ ​ 10,206 ​ ​ 1,070 ​ ​ 9,123 ​ ​ - ​ ​ - ​ ​ 32,655 Substandard ​ ​ 12,332 ​ ​ 2,018 ​ ​ - ​ ​ 10,763 ​ ​ - ​ ​ 2,297 ​ ​ - ​ ​ - ​ ​ 27,410 Total commercial real estate – investor ​ ​ 433,775 ​ ​ 232,121 ​ ​ 123,981 ​ ​ 84,814 ​ ​ 48,005 ​ ​ 57,826 ​ ​ 7,113 ​ ​ - ​ ​ 987,635 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 169,703 ​ ​ 223,731 ​ ​ 105,669 ​ ​ 47,351 ​ ​ 49,367 ​ ​ 86,660 ​ ​ 33,745 ​ ​ - ​ ​ 716,226 Special Mention ​ ​ 8,430 ​ ​ 22,242 ​ ​ 48,184 ​ ​ 17,668 ​ ​ 231 ​ ​ 1,008 ​ ​ - ​ ​ - ​ ​ 97,763 Substandard ​ ​ 2,546 ​ ​ 17,129 ​ ​ 1,191 ​ ​ 16,962 ​ ​ - ​ ​ 3,062 ​ ​ - ​ ​ - ​ ​ 40,890 Total commercial real estate – owner occupied ​ ​ 180,679 ​ ​ 263,102 ​ ​ 155,044 ​ ​ 81,981 ​ ​ 49,598 ​ ​ 90,730 ​ ​ 33,745 ​ ​ - ​ ​ 854,879 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 53,058 ​ ​ 65,758 ​ ​ 39,542 ​ ​ 2,390 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 163,905 Special Mention ​ ​ - ​ ​ - ​ ​ 15,297 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 15,297 Substandard ​ ​ 1,217 ​ ​ - ​ ​ - ​ ​ 116 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 1,333 Total construction ​ ​ 54,275 ​ ​ 65,758 ​ ​ 54,839 ​ ​ 2,506 ​ ​ 226 ​ ​ 1,408 ​ ​ 1,523 ​ ​ - ​ ​ 180,535 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 14,737 ​ ​ 9,910 ​ ​ 6,945 ​ ​ 8,585 ​ ​ 4,853 ​ ​ 9,548 ​ ​ 991 ​ ​ - ​ ​ 55,569 Special Mention ​ ​ - ​ ​ 70 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 70 Substandard ​ ​ 621 ​ ​ - ​ ​ - ​ ​ 499 ​ ​ 186 ​ ​ 408 ​ ​ - ​ ​ - ​ ​ 1,714 Total residential real estate – investor ​ ​ 15,358 ​ ​ 9,980 ​ ​ 6,945 ​ ​ 9,084 ​ ​ 5,039 ​ ​ 9,956 ​ ​ 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 ​ ​ 131 ​ ​ 267 ​ ​ 237 ​ ​ 723 ​ ​ 131 ​ ​ 2,365 ​ ​ - ​ ​ - ​ ​ 3,854 Total residential real estate – owner occupied ​ ​ 42,016 ​ ​ 45,151 ​ ​ 28,655 ​ ​ 16,869 ​ ​ 12,283 ​ ​ 73,106 ​ ​ 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 ​ ​ 2,100 ​ ​ - ​ ​ - ​ ​ - ​ ​ 587 ​ ​ 267 ​ ​ - ​ ​ - ​ ​ 2,954 Total multifamily ​ ​ 79,354 ​ ​ 129,940 ​ ​ 52,604 ​ ​ 14,809 ​ ​ 40,290 ​ ​ 6,365 ​ ​ 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 ​ ​ 1,165,744 ​ ​ 837,389 ​ ​ 401,848 ​ ​ 183,707 ​ ​ 165,368 ​ ​ 226,741 ​ ​ 600,854 ​ ​ - ​ ​ 3,581,651 Special Mention ​ ​ 16,031 ​ ​ 27,684 ​ ​ 70,495 ​ ​ 31,990 ​ ​ 1,301 ​ ​ 10,131 ​ ​ 21,397 ​ ​ - ​ ​ 179,029 Substandard ​ ​ 25,573 ​ ​ 21,862 ​ ​ 4,410 ​ ​ 41,509 ​ ​ 978 ​ ​ 8,708 ​ ​ 5,889 ​ ​ - ​ ​ 108,929 Total loans ​ $ 1,207,348 ​ $ 886,935 ​ $ 476,753 ​ $ 257,206 ​ $ 167,647 ​ $ 245,580 ​ $ 628,140 ​ $ - ​ $ 3,869,609 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Credit quality indicators by class of loans as of December 31, 2021 were as follows in the vintage table below: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 2020 2019 2018 2017 Prior Revolving Loans Revolving Loans Converted To Term Loans Total Commercial ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ $ 192,258 ​ $ 50,638 ​ $ 38,614 ​ $ 28,177 ​ $ 5,176 ​ $ 10,945 ​ $ 408,394 ​ $ 30 ​ $ 734,232 Special Mention ​ ​ 44 ​ ​ 84 ​ ​ 694 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,708 ​ ​ - ​ ​ 4,530 Substandard ​ ​ 9,498 ​ ​ 4,048 ​ ​ 14,121 ​ ​ 326 ​ ​ - ​ ​ 75 ​ ​ 4,644 ​ ​ - ​ ​ 32,712 Total commercial ​ ​ 201,800 ​ ​ 54,770 ​ ​ 53,429 ​ ​ 28,503 ​ ​ 5,176 ​ ​ 11,020 ​ ​ 416,746 ​ ​ 30 ​ ​ 771,474 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Leases ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 83,402 ​ ​ 44,129 ​ $ 32,259 ​ ​ 8,950 ​ ​ 1,170 ​ ​ 2,367 ​ ​ - ​ ​ - ​ ​ 172,277 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ - ​ ​ 2,834 ​ ​ 623 ​ ​ - ​ ​ 297 ​ ​ - ​ ​ - ​ ​ 3,754 Total leases ​ ​ 83,402 ​ ​ 44,129 ​ ​ 35,093 ​ ​ 9,573 ​ ​ 1,170 ​ ​ 2,664 ​ ​ - ​ ​ - ​ ​ 176,031 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 245,346 ​ ​ 175,218 ​ ​ 118,697 ​ ​ 85,049 ​ ​ 64,810 ​ ​ 55,523 ​ ​ 18,602 ​ ​ - ​ ​ 763,245 Special Mention ​ ​ 15,466 ​ ​ - ​ ​ 10,550 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 26,016 Substandard ​ ​ 2,238 ​ ​ 2,378 ​ ​ 451 ​ ​ 181 ​ ​ 3,612 ​ ​ 1,807 ​ ​ - ​ ​ - ​ ​ 10,667 Total commercial real estate – investor ​ ​ 263,050 ​ ​ 177,596 ​ ​ 129,698 ​ ​ 85,230 ​ ​ 68,422 ​ ​ 57,330 ​ ​ 18,602 ​ ​ - ​ ​ 799,928 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Commercial real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 290,225 ​ ​ 155,353 ​ ​ 90,325 ​ ​ 60,915 ​ ​ 54,236 ​ ​ 59,887 ​ ​ 2,522 ​ ​ - ​ ​ 713,463 Special Mention ​ ​ - ​ ​ - ​ ​ 2,953 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,953 Substandard ​ ​ 8,318 ​ ​ 942 ​ ​ 1,686 ​ ​ - ​ ​ 1,251 ​ ​ 3,232 ​ ​ - ​ ​ - ​ ​ 15,429 Total commercial real estate – owner occupied ​ ​ 298,543 ​ ​ 156,295 ​ ​ 94,964 ​ ​ 60,915 ​ ​ 55,487 ​ ​ 63,119 ​ ​ 2,522 ​ ​ - ​ ​ 731,845 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Construction ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 88,620 ​ ​ 65,629 ​ ​ 37,169 ​ ​ 2,727 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 196,958 Special Mention ​ ​ - ​ ​ 2,138 ​ ​ 4,932 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 7,070 Substandard ​ ​ 160 ​ ​ - ​ ​ - ​ ​ 1,944 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,104 Total construction ​ ​ 88,780 ​ ​ 67,767 ​ ​ 42,101 ​ ​ 4,671 ​ ​ 477 ​ ​ 1,193 ​ ​ 1,143 ​ ​ - ​ ​ 206,132 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – investor ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 13,371 ​ ​ 9,758 ​ ​ 13,084 ​ ​ 6,392 ​ ​ 7,059 ​ ​ 10,602 ​ ​ 1,868 ​ ​ - ​ ​ 62,134 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ 121 ​ ​ 144 ​ ​ - ​ ​ 197 ​ ​ 385 ​ ​ 418 ​ ​ - ​ ​ - ​ ​ 1,265 Total residential real estate – investor ​ ​ 13,492 ​ ​ 9,902 ​ ​ 13,084 ​ ​ 6,589 ​ ​ 7,444 ​ ​ 11,020 ​ ​ 1,868 ​ ​ - ​ ​ 63,399 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Residential real estate – owner occupied ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 48,009 ​ ​ 31,912 ​ ​ 20,990 ​ ​ 13,304 ​ ​ 30,562 ​ ​ 60,661 ​ ​ 2,052 ​ ​ - ​ ​ 207,490 Special Mention ​ ​ 659 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 659 Substandard ​ ​ 322 ​ ​ 183 ​ ​ 6 ​ ​ 1,219 ​ ​ 176 ​ ​ 3,193 ​ ​ - ​ ​ - ​ ​ 5,099 Total residential real estate – owner occupied ​ ​ 48,990 ​ ​ 32,095 ​ ​ 20,996 ​ ​ 14,523 ​ ​ 30,738 ​ ​ 63,854 ​ ​ 2,052 ​ ​ - ​ ​ 213,248 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Multifamily ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 109,175 ​ ​ 71,748 ​ ​ 39,293 ​ ​ 61,190 ​ ​ 11,399 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 299,986 Special Mention ​ ​ - ​ ​ - ​ ​ 6,900 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 6,900 Substandard ​ ​ 433 ​ ​ - ​ ​ - ​ ​ 1,543 ​ ​ 302 ​ ​ - ​ ​ - ​ ​ - ​ ​ 2,278 Total multifamily ​ ​ 109,608 ​ ​ 71,748 ​ ​ 46,193 ​ ​ 62,733 ​ ​ 11,701 ​ ​ 7,117 ​ ​ 64 ​ ​ - ​ ​ 309,164 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ HELOC ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 805 ​ ​ 1,667 ​ ​ 12,315 ​ ​ 104,843 ​ ​ - ​ ​ 124,759 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 108 ​ ​ - ​ ​ 108 Substandard ​ ​ - ​ ​ - ​ ​ - ​ ​ 17 ​ ​ 12 ​ ​ 376 ​ ​ 1,018 ​ ​ - ​ ​ 1,423 Total HELOC ​ ​ 907 ​ ​ 2,091 ​ ​ 2,131 ​ ​ 822 ​ ​ 1,679 ​ ​ 12,691 ​ ​ 105,969 ​ ​ - ​ ​ 126,290 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Other ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 8,659 ​ ​ 1,099 ​ ​ 437 ​ ​ 254 ​ ​ 1,414 ​ ​ 4,214 ​ ​ 7,206 ​ ​ - ​ ​ 23,283 Special Mention ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Substandard ​ ​ - ​ ​ 3 ​ ​ - ​ ​ 7 ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ 10 Total other ​ ​ 8,659 ​ ​ 1,102 ​ ​ 437 ​ ​ 261 ​ ​ 1,414 ​ ​ 4,214 ​ ​ 7,206 ​ ​ - ​ ​ 23,293 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Total loans ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Pass ​ ​ 1,079,972 ​ ​ 607,575 ​ ​ 392,999 ​ ​ 267,763 ​ ​ 177,970 ​ ​ 224,824 ​ ​ 546,694 ​ ​ 30 ​ ​ 3,297,827 Special Mention ​ ​ 16,169 ​ ​ 2,222 ​ ​ 26,029 ​ ​ - ​ ​ - ​ ​ - ​ ​ 3,816 ​ ​ - ​ ​ 48,236 Substandard ​ ​ 21,090 ​ ​ 7,698 ​ ​ 19,098 ​ ​ 6,057 ​ ​ 5,738 ​ ​ 9,398 ​ ​ 5,662 ​ ​ - ​ ​ 74,741 Total loans ​ $ 1,117,231 ​ $ 617,495 ​ $ 438,126 ​ $ 273,820 ​ $ 183,708 ​ $ 234,222 ​ $ 556,172 ​ $ 30 ​ $ 3,420,804 ​
Schedule of loans to principal officers, directors, and their affiliates, made in the ordinary course of business	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Beginning balance ​ $ 10,162 ​ $ 783 ​ New loans, including acquired related party loans ​ 267 ​ 11,836 ​ Repayments and other reductions ​ (1,946) ​ (2,457) ​ Change in related party status ​ - ​ - ​ Ending balance ​ $ 8,483 ​ $ 10,162 ​ ​ ​ ​ ​ ​ ​ ​ ​

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2022
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 2022 2021 ​ 2020 Balance at beginning of period ​ $ 2,356 ​ $ 2,474 ​ $ 5,004 Property additions, net of acquisition adjustments ​ ​ 87 ​ ​ 5,748 ​ ​ 898 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Proceeds from property disposals, net of participation purchase and gains/losses ​ ​ 778 ​ ​ 5,787 ​ ​ 3,071 Period valuation write-down ​ ​ 104 ​ ​ 79 ​ ​ 357 Balance at end of period ​ $ 1,561 ​ $ 2,356 ​ $ 2,474 ​
Schedule of activity in valuation allowance	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2022 2021 2020 Balance at beginning of period ​ $ 1,179 ​ $ 1,643 ​ $ 6,712 Provision for unrealized losses ​ ​ 104 ​ ​ 79 ​ ​ 357 Reductions taken on sales ​ ​ (427) ​ ​ (543) ​ ​ (5,426) Balance at end of period ​ $ 856 ​ $ 1,179 ​ $ 1,643 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of expenses related to foreclosed assets, net of lease revenue	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Twelve Months Ended ​ December 31, ​ 2022 2021 ​ 2020 Gain on sales, net ​ $ (163) ​ $ (41) ​ $ (204) Provision for unrealized losses ​ ​ 104 ​ ​ 79 ​ ​ 357 Operating expenses ​ ​ 193 ​ ​ 133 ​ ​ 535 Less: ​ ​ ​ ​ ​ ​ ​ ​ ​ Lease revenue ​ ​ 4 ​ ​ 4 ​ ​ 37 Net OREO expense ​ $ 130 ​ $ 167 ​ $ 651

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Premises and Equipment
Schedule of components of premises and equipment	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Accumulated ​ ​ ​ ​ Accumulated ​ ​ ​ ​ ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Depreciation/ ​ Net Book ​ ​ ​ ​ Cost ​ Amortization ​ Value ​ Cost ​ Amortization ​ Value ​ ​ Land ​ $ 29,741 ​ $ - ​ $ 29,741 ​ $ 42,375 ​ $ - ​ $ 42,375 ​ ​ Buildings ​ 54,075 ​ 24,427 ​ 29,648 ​ 59,313 ​ 26,959 ​ 32,354 ​ ​ Leasehold improvements ​ 2,790 ​ 1,280 ​ 1,510 ​ 2,324 ​ 1,004 ​ 1,320 ​ ​ Furniture and equipment ​ 58,183 ​ 46,727 ​ 11,456 ​ 57,533 ​ 45,577 ​ 11,956 ​ ​ Total Premises and Equipment ​ $ 144,789 ​ $ 72,434 ​ $ 72,355 ​ $ 161,545 ​ $ 73,540 ​ $ 88,005 ​ ​ ​

Deposits (Tables)

Deposits (Tables)	12 Months Ended
	Dec. 31, 2022
Deposits
Schedule of major classifications of deposits	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Noninterest bearing demand ​ $ 2,051,702 ​ $ 2,087,649 ​ Savings ​ ​ 1,145,592 ​ ​ 1,178,542 ​ NOW accounts ​ ​ 609,338 ​ ​ 593,259 ​ Money market accounts ​ ​ 862,170 ​ ​ 1,102,972 ​ Certificates of deposit of less than $100,000 ​ ​ 244,017 ​ ​ 296,298 ​ Certificates of deposit of $100,000 through $250,000 ​ ​ 157,438 ​ ​ 138,794 ​ Certificates of deposit of more than $250,000 ​ ​ 40,466 ​ ​ 68,718 ​ Total deposits ​ $ 5,110,723 ​ $ 5,466,232 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Summary of scheduled maturities of time deposits	​ ​ ​ ​ ​ ​ 2023 $ 310,978 ​ 2024 ​ 71,879 ​ 2025 ​ 35,870 ​ 2026 ​ 17,191 ​ 2027 ​ 6,003 ​ Total time deposits ​ $ 441,921 ​

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2022
Borrowings
Summary of borrowings and junior subordinated debentures	The following table is a summary of borrowings as of December 31, 2022 and 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Securities sold under repurchase agreements ​ $ 32,156 ​ $ 50,337 ​ Other short-term borrowings ​ ​ 90,000 ​ ​ - ​ Junior subordinated debentures 1 ​ ​ 25,773 ​ ​ 25,773 ​ Subordinated debentures ​ ​ 59,297 ​ ​ 59,212 ​ Senior notes ​ ​ 44,585 ​ ​ 44,480 ​ Notes payable and other borrowings ​ ​ 9,000 ​ ​ 19,074 ​ Total borrowings ​ $ 260,811 ​ $ 198,876 ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 See Note 10: Junior Subordinated Debentures, below. ​
Summary of scheduled maturities and weighted average rates of borrowings	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 ​ 2021 ​ ​ ​ ​ ​ Weighted ​ ​ ​ ​ Weighted ​ ​ ​ ​ ​ Average ​ ​ ​ ​ Average ​ Balance Rate Balance Rate 2022 ​ $ - - % $ 58,337 ​ 0.37 % 2023 ​ ​ 131,156 ​ 2.89 ​ ​ 9,000 1.85 ​ 2024 ​ - - ​ - - ​ 2025 ​ - - ​ - ​ - ​ 2026 ​ 44,585 6.02 ​ 46,554 5.88 ​ 2027 ​ - - ​ - ​ - ​ Thereafter ​ 85,070 3.91 ​ 84,985 3.89 ​ Total borrowings ​ $ 260,811 3.76 % $ 198,876 3.23 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
Income Taxes
Schedule of components of income tax expense (benefit)	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Current federal ​ $ 13,241 ​ $ 750 ​ $ 6,269 Current state ​ ​ 6,209 ​ ​ 594 ​ ​ 3,960 Deferred federal ​ ​ 3,338 ​ ​ 4,445 ​ ​ (135) Deferred state ​ ​ 1,356 ​ ​ 2,034 ​ ​ (511) Total income tax expense ​ $ 24,144 ​ $ 7,823 ​ $ 9,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of components of deferred tax assets and liabilities	​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Accrued bonus ​ $ 2,700 ​ $ 1,362 Allowance for credit losses ​ ​ 15,591 ​ ​ 14,636 Deferred compensation ​ ​ 1,292 ​ ​ 1,293 Goodwill amortization/impairment ​ ​ - ​ ​ 919 Stock based compensation ​ ​ 1,257 ​ ​ 911 Business combination adjustments ​ ​ 1,138 ​ ​ 882 Federal recognized built-in loss ("RBIL") carryforward ​ ​ - ​ ​ 493 Other assets ​ ​ 1,621 ​ ​ 1,173 Total deferred tax assets ​ ​ 23,599 ​ ​ 21,669 ​ ​ ​ ​ ​ ​ ​ Accumulated depreciation on premises and equipment ​ ​ (4,107) ​ ​ (1,636) Goodwill amortization/impairment ​ ​ (229) ​ ​ - Mortgage servicing rights ​ ​ (3,103) ​ ​ (1,982) Amortization of core deposit intangible ​ ​ (3,673) ​ ​ (4,269) Acquired securities ​ ​ (1,921) ​ ​ (2,458) Other liabilities ​ ​ (2,025) ​ ​ (1,814) Total deferred tax liabilities ​ ​ (15,058) ​ ​ (12,159) Net deferred tax asset before adjustments related to other comprehensive income ​ ​ 8,541 ​ ​ 9,510 Tax effect of adjustments related to other comprehensive income ​ ​ 36,209 ​ ​ (3,410) Net deferred tax asset ​ $ 44,750 ​ $ 6,100 ​ ​ ​ ​ ​ ​ ​ ​
Schedule of difference between effective tax rates from federal statutory rates	Effective tax rates differ from federal statutory rates applied to financial statement income for the years ended December 31, due to the following: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Tax at statutory federal income tax rate ​ $ 19,225 ​ $ 5,852 ​ $ 7,856 Nontaxable interest income, net of disallowed interest deduction ​ ​ (1,097) ​ ​ (1,069) ​ ​ (1,067) BOLI income ​ ​ (151) ​ ​ (292) ​ ​ (271) State income taxes, net of federal benefit ​ ​ 6,091 ​ ​ 2,054 ​ ​ 2,570 Stock based compensation ​ ​ (43) ​ ​ 54 ​ ​ 297 Transaction costs ​ ​ - ​ ​ 396 ​ ​ - Other, net ​ ​ 119 ​ ​ 828 ​ ​ 198 Total tax at effective tax rate ​ $ 24,144 ​ $ 7,823 ​ $ 9,583 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	12 Months Ended
	Dec. 31, 2022
Equity Compensation Plans
Summary of changes in nonvested shares of restricted share rights	​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2022 ​ ​ ​ ​ Weighted ​ ​ Restricted ​ Average ​ ​ Stock Shares ​ Grant Date ​ and Units Fair Value Unvested at January 1 ​ 540,306 ​ $ 12.04 Granted ​ 279,838 ​ ​ 14.29 Vested ​ (153,790) ​ ​ 12.73 Forfeited ​ (17,144) ​ ​ 12.49 Unvested at December 31 ​ 649,210 ​ $ 12.84 ​ ​ ​ ​ ​ ​ ​

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2022
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): ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Basic earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,526,655 ​ ​ 30,208,663 ​ ​ 29,623,333 Net income ​ ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Basic earnings per share ​ ​ $ 1.51 ​ $ 0.66 ​ $ 0.94 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Diluted earnings per share: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Weighted-average common shares outstanding ​ ​ ​ 44,526,655 ​ ​ 30,208,663 ​ ​ 29,623,333 Dilutive effect of unvested restricted awards 1 ​ ​ ​ 686,433 ​ ​ 529,199 ​ ​ 550,739 Diluted average common shares outstanding ​ ​ ​ 45,213,088 ​ ​ 30,737,862 ​ ​ 30,174,072 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Diluted earnings per share ​ ​ $ 1.49 ​ $ 0.65 ​ $ 0.92 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 1 Includes the common stock equivalents for restricted share rights that are dilutive. ​ ​ ​ ​ ​ ​ ​ ​ ​

Commitments (Tables)

Commitments (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 ​ December 31, 2021 ​ ​ Fixed Variable Total Fixed Variable Total Letters of credit: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial standby ​ $ 3,514 ​ $ 15,365 ​ $ 18,879 ​ $ 384 ​ $ 17,474 ​ $ 17,858 ​ Performance standby ​ ​ 3,161 ​ ​ 13,989 ​ ​ 17,150 ​ ​ 456 ​ ​ 14,907 ​ ​ 15,363 ​ ​ ​ ​ 6,675 ​ ​ 29,354 ​ ​ 36,029 ​ ​ 840 ​ ​ 32,381 ​ ​ 33,221 ​ Non-borrower: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Performance standby ​ ​ - ​ ​ 67 ​ ​ 67 ​ ​ - ​ ​ 67 ​ ​ 67 ​ Total letters of credit ​ $ 6,675 ​ $ 29,421 ​ $ 36,096 ​ $ 840 ​ $ 32,448 ​ $ 33,288 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Unused loan commitments: ​ $ 139,070 ​ $ 860,255 ​ $ 999,325 ​ $ 84,225 ​ $ 895,665 ​ $ 979,890 ​ ​
Schedule of aggregate minimum annual rental commitments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2028 ​ 2023 ​ 2024 ​ 2025 ​ 2026 ​ 2027 ​ and thereafter Rental commitment $ 1,460 ​ $ 1,543 ​ $ 1,792 ​ $ 1,595 ​ $ 1,631 ​ $ 10,036 ​

Regulatory & Capital Matters (T

Regulatory & Capital Matters (Tables)	12 Months Ended
	Dec. 31, 2022
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 ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2021 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Common equity tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ $ 394,421 ​ 9.46 % ​ $ 291,855 ​ 7.00 % ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 290,487 ​ 7.00 ​ ​ $ 269,738 ​ 6.50 % Total capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 522,932 ​ 12.55 ​ ​ ​ 437,513 ​ 10.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 558,503 ​ 13.46 ​ ​ ​ 435,682 ​ 10.50 ​ ​ ​ 414,935 ​ 10.00 ​ Tier 1 capital to risk weighted assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 10.06 ​ ​ ​ 354,382 ​ 8.50 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 12.41 ​ ​ ​ 352,734 ​ 8.50 ​ ​ ​ 331,985 ​ 8.00 ​ Tier 1 capital to average assets ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Consolidated ​ ​ 419,421 ​ 7.81 ​ ​ ​ 214,812 ​ 4.00 ​ ​ ​ N/A ​ N/A ​ Old Second Bank ​ ​ 514,992 ​ 9.58 ​ ​ ​ 215,028 ​ 4.00 ​ ​ ​ 268,785 ​ 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, 2022
Not Designated as Hedging Instrument | Mortgage Banking Derivatives.
Mortgage Banking Derivatives
Schedule of the effect of fair value and cash flow hedge accounting	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Forward contracts: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 2,750 ​ $ 20,000 ​ Fair value ​ 20 ​ 17 ​ ​ ​ ​ ​ ​ ​ ​ ​ Rate lock commitments: ​ ​ ​ ​ ​ ​ ​ Notional amount ​ $ 2,548 ​ $ 14,414 ​ Fair value ​ 56 ​ 491 ​

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Value Measurements
Schedule of balance of assets and liabilities which are measured at fair value on a recurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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, including risk participation agreement ​ ​ - ​ ​ 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ U.S. Treasury ​ $ 202,339 ​ $ - ​ $ - ​ $ 202,339 U.S. government agencies ​ ​ - ​ ​ 61,888 ​ ​ - ​ ​ 61,888 U.S. government agencies mortgage-backed ​ ​ - ​ ​ 172,302 ​ ​ - ​ ​ 172,302 States and political subdivisions ​ ​ - ​ ​ 242,373 ​ ​ 15,236 ​ ​ 257,609 Corporate bonds ​ ​ - ​ ​ 9,887 ​ ​ - ​ ​ 9,887 Collateralized mortgage obligations ​ ​ - ​ ​ 672,967 ​ ​ - ​ ​ 672,967 Asset-backed securities ​ ​ - ​ ​ 236,877 ​ ​ - ​ ​ 236,877 Collateralized loan obligations ​ ​ - ​ ​ 79,763 ​ ​ - ​ ​ 79,763 Loans held-for-sale ​ ​ - ​ ​ 4,737 ​ ​ - ​ ​ 4,737 Mortgage servicing rights ​ ​ - ​ ​ - ​ ​ 7,097 ​ ​ 7,097 Interest rate swap agreements ​ ​ - ​ ​ 3,494 ​ ​ - ​ ​ 3,494 Mortgage banking derivatives ​ ​ - ​ ​ 508 ​ ​ - ​ ​ 508 Total ​ $ 202,339 ​ $ 1,484,796 ​ $ 22,333 ​ $ 1,709,468 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements, including risk participation agreements ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 Total ​ $ - ​ $ 6,809 ​ $ - ​ $ 6,809 ​
Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis	​ worked ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 loss ​ ​ - ​ - ​ (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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Year Ended December 31, 2021 ​ ​ ​ Securities available-for-sale ​ ​ ​ ​ ​ ​ ​ Collateralized States and ​ Mortgage ​ ​ ​ Asset-backed Mortgage Political ​ Servicing ​ ​ Securities Obligations Subdivisions Rights Beginning balance January 1, 2021 ​ $ - $ - $ 4,319 ​ $ 4,224 ​ Transfers into Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Transfers out of Level 3 ​ ​ - ​ - ​ - ​ ​ - ​ Total gains or losses ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Included in earnings ​ ​ - ​ - ​ (20) ​ ​ 2,420 ​ Included in other comprehensive income ​ ​ - ​ - ​ 801 ​ ​ - ​ Purchases, issuances, sales, and settlements ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Purchases ​ ​ - ​ - ​ 11,063 ​ ​ - ​ Issuances ​ ​ - ​ - ​ - ​ ​ 1,612 ​ Settlements ​ ​ - ​ - ​ (927) ​ ​ (1,159) ​ Ending balance December 31, 2021 ​ $ - $ - $ 15,236 ​ $ 7,097 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
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, 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 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2021: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ $ 15,236 ​ Discounted Cash Flow ​ Discount Rate ​ 0.6 - 3.5% ​ 2.8 % ​ ​ ​ ​ ​ ​ ​ Liquidity Premium ​ 0.3 - 2.4% ​ 0.6 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Mortgage servicing rights ​ $ 7,097 ​ Discounted Cash Flow ​ Discount Rate ​ 11.0 - 15.0% ​ 11.0 % ​ ​ ​ ​ ​ ​ ​ Prepayment Speed ​ 0.0 - 36.6% ​ 11.9 % ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
Schedule of assets measured at fair value on a nonrecurring basis	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ Level 1 Level 2 Level 3 Total Individually evaluated loans 1 ​ $ - ​ $ - ​ $ 13,138 ​ $ 13,138 Other real estate owned, net 2 ​ ​ - ​ ​ - ​ ​ 2,356 ​ ​ 2,356 Total ​ $ - ​ $ - ​ $ 15,494 ​ $ 15,494 ​ 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, had a carrying amount of $18.5 million and a valuation allowance of $5.4 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $2.7 million for the year ending December 31, 2021. ​ 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.4 million, which is made up of the outstanding balance of $3.7 million, net of a valuation allowance of $1.2 million and purchase accounting adjustments of $131,000 at December 31, 2021.

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
Fair Values of Financial Instruments
Schedule of carrying amount and estimated fair values of financial instruments	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ ​ Carrying ​ Fair ​ ​ ​ ​ ​ ​ ​ Amount Value Level 1 Level 2 Level 3 Financial assets: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash and due from banks ​ $ 38,565 ​ $ 38,565 ​ $ 38,565 ​ $ - ​ $ - Interest earning deposits with financial institutions ​ ​ 713,542 ​ ​ 713,542 ​ ​ 713,542 ​ ​ - ​ ​ - Securities available-for-sale ​ ​ 1,693,632 ​ ​ 1,693,632 ​ ​ 202,339 ​ ​ 1,476,057 ​ ​ 15,236 FHLBC and FRBC stock ​ ​ 13,257 ​ ​ 13,257 ​ ​ - ​ ​ 13,257 ​ ​ - Loans held-for-sale ​ ​ 4,737 ​ ​ 4,737 ​ ​ - ​ ​ 4,737 ​ ​ - Net loans ​ ​ 3,376,523 ​ ​ 3,407,596 ​ ​ - ​ ​ - ​ ​ 3,407,596 Mortgage servicing rights ​ ​ 7,097 ​ ​ 7,097 ​ ​ - ​ ​ - ​ ​ 7,097 Interest rate swap agreements ​ ​ 3,494 ​ ​ 3,494 ​ ​ - ​ ​ 3,494 ​ ​ - Interest rate lock commitments and forward contracts ​ ​ 508 ​ ​ 508 ​ ​ - ​ ​ 508 ​ ​ - Interest receivable on securities and loans ​ ​ 13,431 ​ ​ 13,431 ​ ​ - ​ ​ 13,431 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Financial liabilities: ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposits ​ $ 2,087,649 ​ $ 2,087,649 ​ $ 2,087,649 ​ $ - ​ $ - Interest bearing deposits ​ ​ 3,378,583 ​ ​ 3,375,930 ​ ​ - ​ ​ 3,375,930 ​ ​ - Securities sold under repurchase agreements ​ ​ 50,337 ​ ​ 50,337 ​ ​ - ​ ​ 50,337 ​ ​ - Other short-term borrowings ​ ​ - ​ ​ - ​ ​ - ​ ​ - ​ ​ - Junior subordinated debentures ​ ​ 25,773 ​ ​ 18,557 ​ ​ - ​ ​ 18,557 ​ ​ - Subordinated debentures ​ ​ 59,212 ​ ​ 60,111 ​ ​ ​ ​ ​ 60,111 ​ ​ ​ Senior notes ​ ​ 44,480 ​ ​ 44,480 ​ ​ 44,480 ​ ​ - ​ ​ - Note payable and other borrowings ​ ​ 19,074 ​ ​ 19,411 ​ ​ - ​ ​ 19,411 ​ ​ - Interest rate swap agreements ​ ​ 6,788 ​ ​ 6,788 ​ ​ - ​ ​ 6,788 ​ ​ - Interest payable on deposits and borrowings ​ ​ 1,706 ​ ​ 1,706 ​ ​ - ​ ​ 1,706 ​ ​ - ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions (Tables)	12 Months Ended
	Dec. 31, 2022
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, 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 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ December 31, 2021 ​ No. of Trans. ​ Notional Amount $ ​ Balance Sheet Location Fair Value $ ​ Balance Sheet Location Fair Value $ Derivatives designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swap agreements 2 ​ 75,774 ​ Other Assets 808 ​ Other Liabilities 4,102 Total derivatives designated as hedging instruments ​ ​ ​ ​ ​ 808 ​ ​ 4,102 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ Derivatives not designated as hedging instruments ​ ​ ​ ​ ​ ​ ​ ​ ​ Interest rate swaps with commercial loan customers 26 ​ 165,005 ​ Other Assets 2,686 ​ Other Liabilities 2,686 Interest rate lock commitments and forward contracts 87 ​ 34,414 ​ Other Assets 508 ​ Other Liabilities - Other contracts 3 ​ 17,173 ​ Other Assets - ​ Other Liabilities 21 Total derivatives not designated as hedging instruments ​ ​ ​ ​ ​ 3,194 ​ ​ 2,707 ​

Parent Company Condensed Fina_2

Parent Company Condensed Financial Information (Tables)	12 Months Ended
	Dec. 31, 2022
Parent Company Condensed Financial Information
Schedule of condensed balance sheets	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 Assets ​ ​ ​ ​ ​ ​ ​ Noninterest bearing deposit with bank subsidiary ​ $ 39,167 ​ $ 25,112 ​ Investment in subsidiaries ​ 555,140 ​ 626,325 ​ Other assets ​ 6,526 ​ 1,111 ​ Total assets ​ $ 600,833 ​ $ 652,548 ​ ​ ​ ​ ​ ​ ​ ​ ​ Liabilities and Stockholders’ Equity ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ $ 25,773 ​ $ 25,773 ​ Subordinated debt ​ 59,297 ​ 59,212 ​ Senior notes ​ ​ 44,585 ​ ​ 44,480 ​ Notes payable ​ ​ 9,000 ​ ​ 13,000 ​ Other liabilities ​ 1,037 ​ 8,056 ​ Stockholders’ equity ​ 461,141 ​ 502,027 ​ Total liabilities and stockholders' equity ​ $ 600,833 ​ $ 652,548 ​ ​
Schedule of condensed statements of operations	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Operating Income ​ ​ ​ ​ ​ ​ ​ ​ ​ Cash dividends received from subsidiaries ​ $ 40,000 ​ $ 40,000 ​ $ 41,300 Other income ​ 29 ​ 15 ​ 32 Total operating income ​ 40,029 ​ 40,015 ​ 41,332 Operating Expenses ​ ​ ​ ​ ​ ​ ​ ​ ​ Junior subordinated debentures ​ 1,136 ​ 1,133 ​ 2,216 Subordinated debt ​ ​ 2,185 ​ ​ 1,610 ​ ​ - Senior notes ​ ​ 2,682 ​ ​ 2,692 ​ ​ 2,693 Notes payable ​ 385 ​ 291 ​ 362 Other expenses ​ 5,086 ​ 6,918 ​ 3,669 Total operating expense ​ 11,474 ​ 12,644 ​ 8,940 Income before income taxes and equity in undistributed net income of subsidiaries ​ 28,555 ​ 27,371 ​ 32,392 Income tax benefit ​ (3,216) ​ (2,986) ​ (2,215) Income before equity in undistributed net income of subsidiaries ​ 31,771 ​ 30,357 ​ 34,607 Equity in undistributed net income of subsidiaries ​ 35,634 ​ (10,313) ​ (6,782) Net income available to common stockholders ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 ​
Schedule of condensed statements of cash Flows	​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2022 2021 2020 Cash Flows from Operating Activities ​ ​ ​ ​ ​ ​ ​ ​ ​ Net Income ​ $ 67,405 ​ $ 20,044 ​ $ 27,825 Adjustments to reconcile net income to net cash from operating activities: ​ ​ ​ ​ ​ ​ ​ ​ ​ Equity in undistributed net income of subsidiaries ​ (35,634) ​ 10,313 ​ 6,782 Provision for deferred tax expense (benefit) ​ 91 ​ (248) ​ (514) Change in taxes payable ​ (4,694) ​ (695) ​ 5,933 Change in other assets ​ 12 ​ (12) ​ 954 Stock-based compensation ​ 2,960 ​ 1,435 ​ 2,089 Other, net ​ (2,753) ​ 961 ​ 682 Net cash provided by operating activities ​ 27,387 ​ 31,798 ​ 43,751 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 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 ​ ​ (8,877) ​ ​ (4,612) ​ ​ (1,186) Purchases of treasury stock ​ (455) ​ (10,417) ​ (5,922) Redemption of junior subordinated debentures ​ ​ - ​ ​ - ​ ​ (32,604) Issuance of term note ​ ​ - ​ ​ - ​ ​ 20,000 Issuance of sub debt ​ ​ - ​ ​ 59,148 ​ ​ - Repayment of term note ​ ​ (4,000) ​ ​ (4,000) ​ ​ (3,000) Net cash (used in) provided by financing activities ​ (13,332) ​ 40,119 ​ (22,712) Net change in cash and cash equivalents ​ 14,055 ​ (22,489) ​ 21,039 Cash and cash equivalents at beginning of year ​ 25,112 ​ 47,601 ​ 26,562 Cash and cash equivalents at end of year ​ $ 39,167 ​ $ 25,112 ​ $ 47,601 ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) segment item	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 17, 2023 $ / shares
Number of banking centres | item	50
Operating segment | segment	1
Reportable Segment | segment	1
Deferred tax assets	$ 23,599,000	$ 21,669,000
Period from due date after which accrual of interest income is discontinued	90 days
Goodwill and Core Deposit Intangible
Amortization of Intangible Assets	$ 2,626,000	644,000	$ 494,000
Subsequent Events
Percentage of forfeiture assumption for group grant	5%
Number of HELOC segments merged | segment	2
Number of HELOC segments | segment	1
Core Deposits
Goodwill and Core Deposit Intangible
Carrying value of the intangible asset	$ 13,700,000	16,300,000
Amortization of Intangible Assets	2,600,000	$ 644,000	$ 494,000
Expected future annual amortization expense:
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2023	2,500,000
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
GCFC/ABC Bank | Core Deposits
Goodwill and Core Deposit Intangible
Useful life (in years)	10 years
Subsequent Event
Subsequent Events
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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Transfers and Servicing of Financial Assets
Mortgage loans serviced for others	$ 771.4	$ 801.9
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
Liabilities
Goodwill			$ 86,478,000	$ 86,332,000
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, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Book value of loans acquired	$ 1,184,133	$ 1,635,802
Accretion recorded on acquired loans year to date	5,574	966
Accretion recorded on acquired unfunded commitments year to date	893	74
West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	1,134,759	1,521,161
ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	33,681	68,783
Talmer Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	15,693	45,858
PCD
Business Acquisition [Line Items]
Book value of loans acquired	77,182	106,956
Accretion recorded on acquired loans year to date	848	401
PCD | West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	75,396	102,409
PCD | ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	1,786	4,547
Non-PCD
Business Acquisition [Line Items]
Book value of loans acquired	1,106,951	1,528,846
Accretion recorded on acquired loans year to date	4,726	565
Non-PCD | West Suburban acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	1,059,363	1,418,752
Non-PCD | ABC Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	31,895	64,236
Non-PCD | Talmer Bank acquired loans
Business Acquisition [Line Items]
Book value of loans acquired	$ 15,693	$ 45,858

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, 2022	Dec. 31, 2021
Cash and Due from Banks.
Cash and cash equivalents	$ 115,177	$ 752,107

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)
Securities Available-for-Sale
Amortized Cost	$ 1,662,819	$ 1,678,160
Gross Unrealized Gains	370	20,587
Gross Unrealized Losses	(123,830)	(5,115)
Securities available-for-sale	1,539,359	1,693,632
Accrued interest receivable	6,800	4,300
FHLB and FRB Stock
FHLBC stock	5,600	7,100
FRBC stock	14,900	6,200
Securities pledged to secure deposits and for other purposes	547,800	501,300
Other disclosures
Securities available-for-sale	$ 1,539,359	1,693,632
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%
Reimbursement requests greater than 5 %
Other disclosures
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	85
Percent of insured loan	5
Reimbursement requests greater than 9 %
Other disclosures
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	75
Percent of insured loan	9
U.S. Treasury
Securities Available-for-Sale
Amortized Cost	$ 224,054	202,251
Gross Unrealized Gains		125
Gross Unrealized Losses	(11,925)	(37)
Securities available-for-sale	212,129	202,339
Other disclosures
Securities available-for-sale	212,129	202,339
U.S. government agencies
Securities Available-for-Sale
Amortized Cost	61,178	62,587
Gross Unrealized Losses	(5,130)	(699)
Securities available-for-sale	56,048	61,888
Other disclosures
Securities available-for-sale	56,048	61,888
U.S. government agencies mortgage-backed
Securities Available-for-Sale
Amortized Cost	140,588	172,016
Gross Unrealized Gains		856
Gross Unrealized Losses	(15,598)	(570)
Securities available-for-sale	124,990	172,302
Other disclosures
Securities available-for-sale	124,990	172,302
States and political subdivisions
Securities Available-for-Sale
Amortized Cost	239,999	241,937
Gross Unrealized Gains	363	16,344
Gross Unrealized Losses	(14,234)	(672)
Securities available-for-sale	226,128	257,609
Other disclosures
Securities available-for-sale	226,128	257,609
Corporate bonds
Securities Available-for-Sale
Amortized Cost	10,000	10,000
Gross Unrealized Losses	(378)	(113)
Securities available-for-sale	9,622	9,887
Other disclosures
Securities available-for-sale	9,622	9,887
Collateralized mortgage obligations
Securities Available-for-Sale
Amortized Cost	596,336	673,238
Gross Unrealized Gains	1	2,014
Gross Unrealized Losses	(62,569)	(2,285)
Securities available-for-sale	533,768	672,967
Other disclosures
Securities available-for-sale	533,768	672,967
Asset-backed Securities
Securities Available-for-Sale
Amortized Cost	210,388	236,293
Gross Unrealized Gains	6	1,245
Gross Unrealized Losses	(8,466)	(661)
Securities available-for-sale	201,928	236,877
Other disclosures
Securities available-for-sale	201,928	236,877
FFEL
Securities Available-for-Sale
Securities available-for-sale	160,800
Other disclosures
Securities available-for-sale	$ 160,800
Percentage of outstanding principal amount of loans guaranteed by US Department of Education	97
Collateralized loan obligations.
Securities Available-for-Sale
Amortized Cost	$ 180,276	79,838
Gross Unrealized Gains		3
Gross Unrealized Losses	(5,530)	(78)
Securities available-for-sale	174,746	79,763
Other disclosures
Securities available-for-sale	$ 174,746	$ 79,763
Loan receivables | GCO Education Loan Funding Corp | Customer Concentration Risk
Other disclosures
Percentage of concentration risk	1%
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, 2022	Dec. 31, 2021
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 62,369
Due after one year through five years	247,711
Due after five years through ten years	43,941
Due after ten years	181,210
Debt securities excluding securities not due at a single maturity date	535,231
Total	$ 1,662,819	$ 1,678,160
Securities Available-for-Sale, Weighted Average Yield
Due in one year or less (as a percent)	0.69%
Due after one year through five years (as a percent)	1.14%
Due after five years through ten years (as a percent)	2.75%
Due after ten years (as a percent)	3.04%
Debt securities (as a percent)	1.86%
Total (as a percent)	3%
Securities Available-for-Sale, Fair Value
Due in one year or less	$ 60,279
Due after one year through five years	231,925
Due after five years through ten years	39,785
Due after ten years	171,938
Debt securities	503,927
Debt Securities, Available-for-sale, Total	1,539,359	1,693,632
Collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Total	596,336	673,238
Securities Available-for-Sale, Fair Value
Debt Securities, Available-for-sale, Total	533,768	672,967
Asset-backed Securities
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	210,388
Total	$ 210,388	236,293
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	4.77%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 201,928
Debt Securities, Available-for-sale, Total	201,928	236,877
Collateralized loan obligations.
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	180,276
Total	$ 180,276	79,838
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	6.21%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 174,746
Debt Securities, Available-for-sale, Total	174,746	$ 79,763
Mortgage-backed and collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	$ 736,924
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.53%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 658,758

Securities - Unrealized Loss Po

Securities - Unrealized Loss Positions (Details) $ in Thousands	Dec. 31, 2022 USD ($) security	Dec. 31, 2021 USD ($) security
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	194	241
Greater than 12 months in an unrealized loss position | security	299	11
Total | security	493	252
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 27,304	$ 4,230
Greater than 12 months in an unrealized loss position	96,526	885
Total	123,830	5,115
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	579,571	734,235
Greater than 12 months in an unrealized loss position	906,689	24,626
Total	$ 1,486,260	$ 758,861
U.S. Treasury
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	1	1
Greater than 12 months in an unrealized loss position | security	4
Total | security	5	1
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 1,025	$ 37
Greater than 12 months in an unrealized loss position	10,900
Total	11,925	37
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	24,121	49,719
Greater than 12 months in an unrealized loss position	188,008
Total	$ 212,129	$ 49,719
U.S. government agencies
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		5
Greater than 12 months in an unrealized loss position | security	9	4
Total | security	9	9
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 592
Greater than 12 months in an unrealized loss position	$ 5,130	107
Total	5,130	699
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		56,879
Greater than 12 months in an unrealized loss position	56,048	5,008
Total	$ 56,048	$ 61,887
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	63
Greater than 12 months in an unrealized loss position | security	117	1
Total | security	132	64
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 975	$ 505
Greater than 12 months in an unrealized loss position	14,623	65
Total	15,598	570
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	11,369	78,711
Greater than 12 months in an unrealized loss position	113,621	1,663
Total	$ 124,990	$ 80,374
States and political subdivisions
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	45	7
Greater than 12 months in an unrealized loss position | security	15	1
Total | security	60	8
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 5,800	$ 55
Greater than 12 months in an unrealized loss position	8,434	617
Total	14,234	672
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	128,770	8,430
Greater than 12 months in an unrealized loss position	48,877	4,051
Total	$ 177,647	$ 12,481
Corporate bonds
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security		2
Greater than 12 months in an unrealized loss position | security	2
Total | security	2	2
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 113
Greater than 12 months in an unrealized loss position	$ 378
Total	378	113
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		9,887
Greater than 12 months in an unrealized loss position	9,622
Total	$ 9,622	$ 9,887
Collateralized mortgage obligations
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	80	133
Greater than 12 months in an unrealized loss position | security	120
Total | security	200	133
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 12,895	$ 2,285
Greater than 12 months in an unrealized loss position	49,674
Total	62,569	2,285
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	180,624	381,658
Greater than 12 months in an unrealized loss position	348,880
Total	$ 529,504	$ 381,658
Asset-backed Securities
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	30	20
Greater than 12 months in an unrealized loss position | security	21	3
Total | security	51	23
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 3,030	$ 608
Greater than 12 months in an unrealized loss position	5,436	53
Total	8,466	661
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	121,915	103,819
Greater than 12 months in an unrealized loss position	79,659	3,276
Total	$ 201,574	$ 107,095
Collateralized loan obligations.
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position | security	23	10
Greater than 12 months in an unrealized loss position | security	11	2
Total | security	34	12
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 3,579	$ 35
Greater than 12 months in an unrealized loss position	1,951	43
Total	5,530	78
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	112,772	45,132
Greater than 12 months in an unrealized loss position	61,974	10,628
Total	$ 174,746	$ 55,760

Securities - Realized Gain (Los

Securities - Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Securities
Proceeds from sales of securities	$ 30,981	$ 605,846	$ 18,006
Gross realized gains on securities		270	17
Gross realized losses on securities	(944)	(38)	(42)
Net realized (losses) gains	(944)	232	(25)
Income tax benefit (expense) on net realized (losses) gains	$ 265	$ (65)	$ 7
Effective tax rate applied (as a percent)	28.10%	28%	28%

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 3,869,609	$ 3,420,804
Total Loans	3,869,609	3,420,804
Allowance for credit losses	(49,480)	(44,281)
Net loans	3,820,129	3,376,523
Total loans	50,478	43,129
Loans and leases receivable, accrued interest receivable	15,900	9,200
Paycheck Protection Program (PPP)
Loans
Total Loans	1,600	38,400
Commercial
Loans
Total loans, excluding deferred loan costs and PCI loans	840,964	771,474
Total Loans	840,964	771,474
Total loans	7,162	11,887
Leases
Loans
Total loans, excluding deferred loan costs and PCI loans	277,385	176,031
Total Loans	277,385	176,031
Total loans	1,248	3,754
Commercial real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	987,635	799,928
Total Loans	987,635	799,928
Total loans	16,576	5,693
Commercial real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	854,879	731,845
Total Loans	854,879	731,845
Total loans	21,498	11,637
Construction
Loans
Total loans, excluding deferred loan costs and PCI loans	180,535	206,132
Total Loans	180,535	206,132
Total loans		2,104
Residential real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	57,353	63,399
Total Loans	57,353	63,399
Total loans	675	925
Residential real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	219,718	213,248
Total Loans	219,718	213,248
Total loans	1,817	4,271
Multifamily
Loans
Total loans, excluding deferred loan costs and PCI loans	323,691	309,164
Total Loans	323,691	309,164
Total loans	1,322	1,845
HELOC
Loans
Total loans, excluding deferred loan costs and PCI loans	109,202	126,290
Total Loans	109,202	126,290
Total loans	180	1,006
Others
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 18,247	23,293
Other 1
Loans
Total Loans		$ 3,420,804

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Major Classifications - Loan Concentrations (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Real estate | Loan receivables | Customer Concentration Risk
Loans
Loans receivable as a percentage of total portfolio	70.60%	71.60%

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Allowance for loan losses:
Beginning Balance	$ 44,281	$ 33,855	$ 19,789
(Release of) Provision for Credit Losses	6,750	2,795	9,166
Charge-offs	2,460	5,933	3,068
Recoveries	909	1,489	2,089
Ending Balance	49,480	44,281	33,855
Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	12,075
(Release of) Provision for Credit Losses			5,879
Ending Balance		12,075
Commercial
Allowance for loan losses:
Beginning Balance	11,751	2,812	3,015
(Release of) Provision for Credit Losses	273	2,389	72
Charge-offs	151	963	39
Recoveries	95	352	56
Ending Balance	11,968	11,751	2,812
Commercial | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	7,161
(Release of) Provision for Credit Losses			(292)
Ending Balance		7,161
Leases
Allowance for loan losses:
Beginning Balance	3,480	3,888	1,262
(Release of) Provision for Credit Losses	(246)	(339)	2,233
Charge-offs	371	69	206
Recoveries	2		98
Ending Balance	2,865	3,480	3,888
Leases | Accounting Standards Update 2016-13
Allowance for loan losses:
(Release of) Provision for Credit Losses			501
Commercial real estate - Investor
Allowance for loan losses:
Beginning Balance	10,795	7,899	6,218
(Release of) Provision for Credit Losses	1,199	3,665	2,769
Charge-offs	1,401	2,724	512
Recoveries	81	78	165
Ending Balance	10,674	10,795	7,899
Commercial real estate - Investor | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	1,877
(Release of) Provision for Credit Losses			(741)
Ending Balance		1,877
Commercial real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	4,913	3,557	3,678
(Release of) Provision for Credit Losses	10,117	147	1,793
Charge-offs	133	1,797	1,763
Recoveries	104	235	697
Ending Balance	15,001	4,913	3,557
Commercial real estate - Owner occupied | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	2,771
(Release of) Provision for Credit Losses			(848)
Ending Balance		2,771
Real estate - construction
Allowance for loan losses:
Beginning Balance	3,373	4,054	513
(Release of) Provision for Credit Losses	(1,827)	(783)	2,095
Charge-offs			60
Recoveries			172
Ending Balance	1,546	3,373	4,054
Real estate - construction | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	102
(Release of) Provision for Credit Losses			1,334
Ending Balance		102
Residential real estate - Investor
Allowance for loan losses:
Beginning Balance	760	1,740	601
(Release of) Provision for Credit Losses	(22)	(1,294)	350
Charge-offs			8
Recoveries	30	291	57
Ending Balance	768	760	1,740
Residential real estate - Investor | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	23
(Release of) Provision for Credit Losses			740
Ending Balance		23
Residential real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	2,832	2,714	1,257
(Release of) Provision for Credit Losses	(1,010)	(176)	(107)
Charge-offs	2		43
Recoveries	226	158	287
Ending Balance	2,046	2,832	2,714
Residential real estate - Owner occupied | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	136
(Release of) Provision for Credit Losses			1,320
Ending Balance		136
Multifamily
Allowance for loan losses:
Beginning Balance	3,675	3,625	1,444
(Release of) Provision for Credit Losses	(1,285)	233	449
Charge-offs		183
Recoveries	63
Ending Balance	2,453	3,675	3,625
Multifamily | Accounting Standards Update 2016-13
Allowance for loan losses:
(Release of) Provision for Credit Losses			1,732
HELOC
Allowance for loan losses:
Beginning Balance	2,510	1,948	1,161
(Release of) Provision for Credit Losses	(844)	340	(933)
Charge-offs		17	193
Recoveries	140	234	387
Ending Balance	1,806	2,510	1,948
HELOC | Accounting Standards Update 2016-13
Allowance for loan losses:
Beginning Balance	5
(Release of) Provision for Credit Losses			1,526
Ending Balance		5
Other
Allowance for loan losses:
Beginning Balance	192	1,618	640
(Release of) Provision for Credit Losses	395	(1,387)	445
Charge-offs	402	180	244
Recoveries	168	141	170
Ending Balance	$ 353	$ 192	1,618
Other | Accounting Standards Update 2016-13
Allowance for loan losses:
(Release of) Provision for Credit Losses			$ 607

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 50,478	$ 43,129
ACL Allocation	49,480	44,281
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	40,641	26,977
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	5,915	9,901
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,248	3,249
Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,674	3,002
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	10,744	5,387
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	7,162	11,887
Commercial | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	883	1,986
Commercial | Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	5,915	9,901
Commercial | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	364
Commercial | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	569	2,677
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,248	3,754
Leases | Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,248	3,249
Leases | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		505
Leases | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	1,248	811
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	16,576	5,693
Commercial real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	16,576	5,693
Commercial real estate - Investor | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,875
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	21,498	11,637
Commercial real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	19,188	9,147
Commercial real estate - Owner occupied | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,310	2,490
Commercial real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	5,808	362
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		2,104
Construction | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		2,104
Construction | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		992
Residential real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	675	925
Residential real estate - Investor | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	675	925
Residential real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,817	4,271
Residential real estate - Owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,817	4,271
Residential real estate - Owner occupied | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	244	276
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,322	1,845
Multifamily | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,322	1,845
Multifamily | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		75
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	180	1,006
HELOC | Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 180	1,006
HELOC | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		190
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		7
Other | Other.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral		7
Other | Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation		$ 4

Loans and Allowance for Credi_7

Loans and Allowance for Credit Losses on Loans - Aging Analysis (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Aged analysis of past due loans
Total Loans	$ 3,869,609	$ 3,420,804
Total loans, including deferred loan loan costs and PCI	3,820,129	3,376,523
Recorded Investment 90 days or Greater Past Due and Accruing	$ 1,262
Total Loans		$ 3,110
Number of loan modifications, CARES Act | loan		509
Number of loan modifications with deferral request, CARES Act | loan	0	7
Number of loan modifications resumed payments, CARES Act | loan	509	502
Number of loan modifications in non accrual status, CARES Act | loan		6
Pre-modification, CARES Act		$ 234,900
Post-modification, CARES Act		7,800
Total non accrual loans		7,700
Special Mention [Member]
Aged analysis of past due loans
Total Loans	$ 179,029
Financial Asset, Past Due [Member]
Aged analysis of past due loans
Total Past Due Including PCI loans	22,214	27,342
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due Including PCI loans	6,326	9,342
60 to 89 Days Past Due
Aged analysis of past due loans
Current	2,874
Total Past Due Including PCI loans		4,356
90 Days or Greater Past Due
Aged analysis of past due loans
Current	13,014
Total Past Due Including PCI loans		13,644
Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	3,847,395
Current including PCI Loans		3,393,462
Commercial
Aged analysis of past due loans
Total Loans	840,964	771,474
Recorded Investment 90 days or Greater Past Due and Accruing	460	1,396
Commercial | Special Mention [Member]
Aged analysis of past due loans
Total Loans	27,047	4,530
Commercial | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,840	6,648
Commercial | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	3	3,407
Commercial | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1,012	1,413
Commercial | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	825	1,828
Commercial | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	839,124	764,826
Leases
Aged analysis of past due loans
Total Loans	277,385	176,031
Leases | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,083	1,696
Leases | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	447	125
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	614	1,571
Leases | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	276,302	174,335
Commercial real estate - Investor
Aged analysis of past due loans
Total Loans	987,635	799,928
Commercial real estate - Investor | Special Mention [Member]
Aged analysis of past due loans
Total Loans	32,655	26,016
Commercial real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	8,867	1,374
Commercial real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	3,276
Commercial real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	1,276	267
Commercial real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	4,315	1,107
Commercial real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	978,768	798,554
Commercial real estate - Owner occupied
Aged analysis of past due loans
Total Loans	854,879	731,845
Recorded Investment 90 days or Greater Past Due and Accruing	173	1,594
Commercial real estate - Owner occupied | Special Mention [Member]
Aged analysis of past due loans
Total Loans	97,763	2,953
Commercial real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	2,697	7,672
Commercial real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	373	2,324
Commercial real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	113	500
Commercial real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	2,211	4,848
Commercial real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	852,182	724,173
Real estate - construction
Aged analysis of past due loans
Total Loans	180,535	206,132
Real estate - construction | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	130	854
Real estate - construction | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	14	854
Real estate - construction | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	116
Real estate - construction | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	180,405	205,278
Residential real estate - Investor
Aged analysis of past due loans
Total Loans	57,353	63,399
Recorded Investment 90 days or Greater Past Due and Accruing	144	23
Residential real estate - Investor | Special Mention [Member]
Aged analysis of past due loans
Total Loans	70
Residential real estate - Investor | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,432	1,657
Residential real estate - Investor | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	445	395
Residential real estate - Investor | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		470
Residential real estate - Investor | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	987	792
Residential real estate - Investor | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	55,921	61,742
Residential real estate - Owner occupied
Aged analysis of past due loans
Total Loans	219,718	213,248
Recorded Investment 90 days or Greater Past Due and Accruing	485	97
Residential real estate - Owner occupied | Special Mention [Member]
Aged analysis of past due loans
Total Loans		659
Residential real estate - Owner occupied | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	3,423	5,662
Residential real estate - Owner occupied | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	1,191	1,994
Residential real estate - Owner occupied | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		591
Residential real estate - Owner occupied | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	2,232	3,077
Residential real estate - Owner occupied | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	216,295	207,586
Multifamily
Aged analysis of past due loans
Total Loans	323,691	309,164
Multifamily | Special Mention [Member]
Aged analysis of past due loans
Total Loans	6,086	6,900
Multifamily | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	1,950	1,046
Multifamily | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	267
Multifamily | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	361	1,046
Multifamily | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	1,322
Multifamily | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	321,741	308,118
HELOC
Aged analysis of past due loans
Total Loans	109,202	126,290
HELOC | Special Mention [Member]
Aged analysis of past due loans
Total Loans	111	108
HELOC | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	773	614
HELOC | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	291	193
HELOC | 60 to 89 Days Past Due
Aged analysis of past due loans
Current	90	23
HELOC | 90 Days or Greater Past Due
Aged analysis of past due loans
Current	392	398
HELOC | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	108,429	125,676
Other
Aged analysis of past due loans
Total Loans	18,247	23,293
Other | Financial Asset, Past Due [Member]
Aged analysis of past due loans
Current	19	119
Other | 30 to 59 Days Past Due
Aged analysis of past due loans
Current	19	50
Other | 60 to 89 Days Past Due
Aged analysis of past due loans
Current		46
Other | 90 Days or Greater Past Due
Aged analysis of past due loans
Current		23
Other | Financial Asset, Not Past Due [Member]
Aged analysis of past due loans
Current	$ 18,228	23,174
Other 1
Aged analysis of past due loans
Total Loans		3,420,804
Other 1 | Special Mention [Member]
Aged analysis of past due loans
Total Loans		$ 48,236

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Nonaccruals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 31,602	$ 41,531
Non accrual including PCI Loans		3,420,804
Nonaccrual with no ACL	18,404	37,145
Interest on nonaccrual loans	284,000
Accrued interest reversed against interest income	108,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	7,189	11,894
Nonaccrual with no ACL	6,598	9,217
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,876	3,754
Nonaccrual with no ACL		2,943
Commercial real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	4,346	5,694
Nonaccrual with no ACL	4,244	5,694
Commercial real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	8,050	11,637
Nonaccrual with no ACL	3,813	11,205
Real estate - construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	251	160
Nonaccrual with no ACL		160
Residential real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,528	876
Nonaccrual with no ACL	675	876
Residential real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,713	4,898
Nonaccrual with no ACL	1,572	4,622
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,538	1,573
Nonaccrual with no ACL	1,322	1,573
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,109	1,042
Nonaccrual with no ACL	180	852
Other 1
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 2	3
Nonaccrual with no ACL		$ 3

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Credit Quality (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans by risk rating
2022 / 2021	$ 1,207,348,000
2021 / 2020	886,935,000
2020 / 2019	476,753,000
2019 / 2018	257,206,000
2018 / 2017	167,647,000
Prior	245,580,000
Revolving Loans	628,140,000
Total Loans	3,869,609,000	$ 3,420,804,000
Total Loans		3,110,000
Minimum
Loans by risk rating
Loan commitment for inclusion in credit quality analysis	50,000
Pass [Member]
Loans by risk rating
2022 / 2021	1,165,744,000
2021 / 2020	837,389,000
2020 / 2019	401,848,000
2019 / 2018	183,707,000
2018 / 2017	165,368,000
Prior	226,741,000
Revolving Loans	600,854,000
Total Loans	3,581,651,000
Special Mention [Member]
Loans by risk rating
2022 / 2021	16,031,000
2021 / 2020	27,684,000
2020 / 2019	70,495,000
2019 / 2018	31,990,000
2018 / 2017	1,301,000
Prior	10,131,000
Revolving Loans	21,397,000
Total Loans	179,029,000
Substandard [Member]
Loans by risk rating
2022 / 2021	25,573,000
2021 / 2020	21,862,000
2020 / 2019	4,410,000
2019 / 2018	41,509,000
2018 / 2017	978,000
Prior	8,708,000
Revolving Loans	5,889,000
Total Loans	108,929,000
Commercial
Loans by risk rating
2022 / 2021	231,889,000	201,800,000
2021 / 2020	73,327,000	54,770,000
2020 / 2019	25,760,000	53,429,000
2019 / 2018	27,350,000	28,503,000
2018 / 2017	6,964,000	5,176,000
Prior	2,651,000	11,020,000
Revolving Loans	473,023,000	416,746,000
Revolving Loans Converted To Term Loans		30,000
Total Loans	840,964,000	771,474,000
Commercial | Pass [Member]
Loans by risk rating
2022 / 2021	225,056,000	192,258,000
2021 / 2020	70,608,000	50,638,000
2020 / 2019	21,597,000	38,614,000
2019 / 2018	12,742,000	28,177,000
2018 / 2017	6,957,000	5,176,000
Prior	2,651,000	10,945,000
Revolving Loans	447,821,000	408,394,000
Revolving Loans Converted To Term Loans		30,000
Total Loans	787,432,000	734,232,000
Commercial | Special Mention [Member]
Loans by risk rating
2022 / 2021	1,875,000	44,000
2021 / 2020	272,000	84,000
2020 / 2019	1,182,000	694,000
2019 / 2018	2,432,000
Revolving Loans	21,286,000	3,708,000
Total Loans	27,047,000	4,530,000
Commercial | Substandard [Member]
Loans by risk rating
2022 / 2021	4,958,000	9,498,000
2021 / 2020	2,447,000	4,048,000
2020 / 2019	2,981,000	14,121,000
2019 / 2018	12,176,000	326,000
2018 / 2017	7,000
Prior		75,000
Revolving Loans	3,916,000	4,644,000
Total Loans	26,485,000	32,712,000
Consumer
Loans by risk rating
Mortgage loans in process of foreclosure	600,000	488,000
Leases
Loans by risk rating
2022 / 2021	162,985,000	83,402,000
2021 / 2020	64,203,000	44,129,000
2020 / 2019	26,995,000	35,093,000
2019 / 2018	17,923,000	9,573,000
2018 / 2017	4,449,000	1,170,000
Prior	830,000	2,664,000
Total Loans	277,385,000	176,031,000
Leases | Pass [Member]
Loans by risk rating
2022 / 2021	161,379,000	83,402,000
2021 / 2020	64,203,000	44,129,000
2020 / 2019	26,995,000	32,259,000
2019 / 2018	17,653,000	8,950,000
2018 / 2017	4,449,000	1,170,000
Prior	830,000	2,367,000
Total Loans	275,509,000	172,277,000
Leases | Substandard [Member]
Loans by risk rating
2022 / 2021	1,606,000
2019 / 2018	270,000
Total Loans	1,876,000
Leases | PCD | Substandard [Member]
Loans by risk rating
2020 / 2019		2,834,000
2019 / 2018		623,000
Prior		297,000
Total Loans		3,754,000
Commercial real estate - Investor
Loans by risk rating
2022 / 2021	433,775,000	263,050,000
2021 / 2020	232,121,000	177,596,000
2020 / 2019	123,981,000	129,698,000
2019 / 2018	84,814,000	85,230,000
2018 / 2017	48,005,000	68,422,000
Prior	57,826,000	57,330,000
Revolving Loans	7,113,000	18,602,000
Total Loans	987,635,000	799,928,000
Commercial real estate - Investor | Pass [Member]
Loans by risk rating
2022 / 2021	416,094,000	245,346,000
2021 / 2020	228,686,000	175,218,000
2020 / 2019	118,491,000	118,697,000
2019 / 2018	63,845,000	85,049,000
2018 / 2017	46,935,000	64,810,000
Prior	46,406,000	55,523,000
Revolving Loans	7,113,000	18,602,000
Total Loans	927,570,000	763,245,000
Commercial real estate - Investor | Special Mention [Member]
Loans by risk rating
2022 / 2021	5,349,000	15,466,000
2021 / 2020	1,417,000
2020 / 2019	5,490,000	10,550,000
2019 / 2018	10,206,000
2018 / 2017	1,070,000
Prior	9,123,000
Total Loans	32,655,000	26,016,000
Commercial real estate - Investor | Substandard [Member]
Loans by risk rating
2022 / 2021	12,332,000	2,238,000
2021 / 2020	2,018,000	2,378,000
2020 / 2019		451,000
2019 / 2018	10,763,000	181,000
2018 / 2017		3,612,000
Prior	2,297,000	1,807,000
Total Loans	27,410,000	10,667,000
Commercial real estate - Owner occupied
Loans by risk rating
2022 / 2021	180,679,000	298,543,000
2021 / 2020	263,102,000	156,295,000
2020 / 2019	155,044,000	94,964,000
2019 / 2018	81,981,000	60,915,000
2018 / 2017	49,598,000	55,487,000
Prior	90,730,000	63,119,000
Revolving Loans	33,745,000	2,522,000
Total Loans	854,879,000	731,845,000
Commercial real estate - Owner occupied | Pass [Member]
Loans by risk rating
2022 / 2021	169,703,000	290,225,000
2021 / 2020	223,731,000	155,353,000
2020 / 2019	105,669,000	90,325,000
2019 / 2018	47,351,000	60,915,000
2018 / 2017	49,367,000	54,236,000
Prior	86,660,000	59,887,000
Revolving Loans	33,745,000	2,522,000
Total Loans	716,226,000	713,463,000
Commercial real estate - Owner occupied | Special Mention [Member]
Loans by risk rating
2022 / 2021	8,430,000
2021 / 2020	22,242,000
2020 / 2019	48,184,000	2,953,000
2019 / 2018	17,668,000
2018 / 2017	231,000
Prior	1,008,000
Total Loans	97,763,000	2,953,000
Commercial real estate - Owner occupied | Substandard [Member]
Loans by risk rating
2022 / 2021	2,546,000	8,318,000
2021 / 2020	17,129,000	942,000
2020 / 2019	1,191,000	1,686,000
2019 / 2018	16,962,000
2018 / 2017		1,251,000
Prior	3,062,000	3,232,000
Total Loans	40,890,000	15,429,000
Construction
Loans by risk rating
2022 / 2021	54,275,000	88,780,000
2021 / 2020	65,758,000	67,767,000
2020 / 2019	54,839,000	42,101,000
2019 / 2018	2,506,000	4,671,000
2018 / 2017	226,000	477,000
Prior	1,408,000	1,193,000
Revolving Loans	1,523,000	1,143,000
Total Loans	180,535,000	206,132,000
Construction | Pass [Member]
Loans by risk rating
2022 / 2021	53,058,000	88,620,000
2021 / 2020	65,758,000	65,629,000
2020 / 2019	39,542,000	37,169,000
2019 / 2018	2,390,000	2,727,000
2018 / 2017	226,000	477,000
Prior	1,408,000	1,193,000
Revolving Loans	1,523,000	1,143,000
Total Loans	163,905,000	196,958,000
Construction | Special Mention [Member]
Loans by risk rating
2021 / 2020		2,138,000
2020 / 2019	15,297,000	4,932,000
Total Loans	15,297,000	7,070,000
Construction | Substandard [Member]
Loans by risk rating
2022 / 2021	1,217,000	160,000
2019 / 2018	116,000	1,944,000
Total Loans	1,333,000	2,104,000
Residential real estate - Investor
Loans by risk rating
2022 / 2021	15,358,000	13,492,000
2021 / 2020	9,980,000	9,902,000
2020 / 2019	6,945,000	13,084,000
2019 / 2018	9,084,000	6,589,000
2018 / 2017	5,039,000	7,444,000
Prior	9,956,000	11,020,000
Revolving Loans	991,000	1,868,000
Total Loans	57,353,000	63,399,000
Residential real estate - Investor | Pass [Member]
Loans by risk rating
2022 / 2021	14,737,000	13,371,000
2021 / 2020	9,910,000	9,758,000
2020 / 2019	6,945,000	13,084,000
2019 / 2018	8,585,000	6,392,000
2018 / 2017	4,853,000	7,059,000
Prior	9,548,000	10,602,000
Revolving Loans	991,000	1,868,000
Total Loans	55,569,000	62,134,000
Residential real estate - Investor | Special Mention [Member]
Loans by risk rating
2021 / 2020	70,000
Total Loans	70,000
Residential real estate - Investor | Substandard [Member]
Loans by risk rating
2022 / 2021	621,000	121,000
2021 / 2020		144,000
2019 / 2018	499,000	197,000
2018 / 2017	186,000	385,000
Prior	408,000	418,000
Total Loans	1,714,000	1,265,000
Residential real estate - Owner occupied
Loans by risk rating
2022 / 2021	42,016,000	48,990,000
2021 / 2020	45,151,000	32,095,000
2020 / 2019	28,655,000	20,996,000
2019 / 2018	16,869,000	14,523,000
2018 / 2017	12,283,000	30,738,000
Prior	73,106,000	63,854,000
Revolving Loans	1,638,000	2,052,000
Total Loans	219,718,000	213,248,000
Residential real estate - Owner occupied | Pass [Member]
Loans by risk rating
2022 / 2021	41,885,000	48,009,000
2021 / 2020	44,884,000	31,912,000
2020 / 2019	28,418,000	20,990,000
2019 / 2018	16,146,000	13,304,000
2018 / 2017	12,152,000	30,562,000
Prior	70,741,000	60,661,000
Revolving Loans	1,638,000	2,052,000
Total Loans	215,864,000	207,490,000
Residential real estate - Owner occupied | Special Mention [Member]
Loans by risk rating
2022 / 2021		659,000
Total Loans		659,000
Residential real estate - Owner occupied | Substandard [Member]
Loans by risk rating
2022 / 2021	131,000	322,000
2021 / 2020	267,000	183,000
2020 / 2019	237,000	6,000
2019 / 2018	723,000	1,219,000
2018 / 2017	131,000	176,000
Prior	2,365,000	3,193,000
Total Loans	3,854,000	5,099,000
Multifamily
Loans by risk rating
2022 / 2021	79,354,000	109,608,000
2021 / 2020	129,940,000	71,748,000
2020 / 2019	52,604,000	46,193,000
2019 / 2018	14,809,000	62,733,000
2018 / 2017	40,290,000	11,701,000
Prior	6,365,000	7,117,000
Revolving Loans	329,000	64,000
Total Loans	323,691,000	309,164,000
Multifamily | Pass [Member]
Loans by risk rating
2022 / 2021	76,877,000	109,175,000
2021 / 2020	126,257,000	71,748,000
2020 / 2019	52,262,000	39,293,000
2019 / 2018	13,125,000	61,190,000
2018 / 2017	39,703,000	11,399,000
Prior	6,098,000	7,117,000
Revolving Loans	329,000	64,000
Total Loans	314,651,000	299,986,000
Multifamily | Special Mention [Member]
Loans by risk rating
2022 / 2021	377,000
2021 / 2020	3,683,000
2020 / 2019	342,000	6,900,000
2019 / 2018	1,684,000
Total Loans	6,086,000	6,900,000
Multifamily | Substandard [Member]
Loans by risk rating
2022 / 2021	2,100,000	433,000
2019 / 2018		1,543,000
2018 / 2017	587,000	302,000
Prior	267,000
Total Loans	2,954,000	2,278,000
HELOC
Loans by risk rating
2022 / 2021	2,822,000	907,000
2021 / 2020	518,000	2,091,000
2020 / 2019	1,497,000	2,131,000
2019 / 2018	1,703,000	822,000
2018 / 2017	724,000	1,679,000
Prior	2,597,000	12,691,000
Revolving Loans	99,341,000	105,969,000
Total Loans	109,202,000	126,290,000
HELOC | Pass [Member]
Loans by risk rating
2022 / 2021	2,760,000	907,000
2021 / 2020	517,000	2,091,000
2020 / 2019	1,497,000	2,131,000
2019 / 2018	1,703,000	805,000
2018 / 2017	657,000	1,667,000
Prior	2,288,000	12,315,000
Revolving Loans	97,258,000	104,843,000
Total Loans	106,680,000	124,759,000
HELOC | Special Mention [Member]
Loans by risk rating
Revolving Loans	111,000	108,000
Total Loans	111,000	108,000
HELOC | Substandard [Member]
Loans by risk rating
2022 / 2021	62,000
2021 / 2020	1,000
2019 / 2018		17,000
2018 / 2017	67,000	12,000
Prior	309,000	376,000
Revolving Loans	1,972,000	1,018,000
Total Loans	2,411,000	1,423,000
Other
Loans by risk rating
2022 / 2021	4,195,000	8,659,000
2021 / 2020	2,835,000	1,102,000
2020 / 2019	433,000	437,000
2019 / 2018	167,000	261,000
2018 / 2017	69,000	1,414,000
Prior	111,000	4,214,000
Revolving Loans	10,437,000	7,206,000
Total Loans	18,247,000	23,293,000
Other | Pass [Member]
Loans by risk rating
2022 / 2021	4,195,000	8,659,000
2021 / 2020	2,835,000	1,099,000
2020 / 2019	432,000	437,000
2019 / 2018	167,000	254,000
2018 / 2017	69,000	1,414,000
Prior	111,000	4,214,000
Revolving Loans	10,436,000	7,206,000
Total Loans	18,245,000	23,283,000
Other | Substandard [Member]
Loans by risk rating
2021 / 2020		3,000
2020 / 2019	1,000
2019 / 2018		7,000
Revolving Loans	1,000
Total Loans	$ 2,000	10,000
Other 1
Loans by risk rating
2022 / 2021		1,117,231,000
2021 / 2020		617,495,000
2020 / 2019		438,126,000
2019 / 2018		273,820,000
2018 / 2017		183,708,000
Prior		234,222,000
Revolving Loans		556,172,000
Revolving Loans Converted To Term Loans		30,000
Total Loans		3,420,804,000
Other 1 | Pass [Member]
Loans by risk rating
2022 / 2021		1,079,972,000
2021 / 2020		607,575,000
2020 / 2019		392,999,000
2019 / 2018		267,763,000
2018 / 2017		177,970,000
Prior		224,824,000
Revolving Loans		546,694,000
Revolving Loans Converted To Term Loans		30,000
Total Loans		3,297,827,000
Other 1 | Special Mention [Member]
Loans by risk rating
2022 / 2021		16,169,000
2021 / 2020		2,222,000
2020 / 2019		26,029,000
Revolving Loans		3,816,000
Total Loans		48,236,000
Other 1 | Substandard [Member]
Loans by risk rating
2022 / 2021		21,090,000
2021 / 2020		7,698,000
2020 / 2019		19,098,000
2019 / 2018		6,057,000
2018 / 2017		5,738,000
Prior		9,398,000
Revolving Loans		5,662,000
Total Loans		$ 74,741,000

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses on Loans - TDR (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan
Troubled debt restructurings - modified during the period
Number of TDR loan modifications | loan	4	1
Loan modification activity	$ 478,000	$ 2,300,000
Other information
Commitments to lend to borrowers whose loans were classified as impaired	0	0
HELOC | Others [Member]
TDR's defaulted
Pre-modification outstanding recorded investment during the period	$ 0	$ 0

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses on Loans - Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans to principal officers, directors, and their affiliates
Beginning balance	$ 10,162	$ 783
New loans, including acquired related party loans	267	11,836
Repayments and other reductions	(1,946)	(2,457)
Ending balance	$ 8,483	$ 10,162

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve
Balance at beginning of period	$ 2,356	$ 2,474	$ 5,004
Property additions, net of acquisition adjustments	87	5,748	898
Less: Proceeds from property disposals, net of participation purchase and of gains/losses	778	5,787	3,071
Less: Period valuation write-down	104	79	357
Balance at end of period	1,561	2,356	2,474
Activity in the valuation allowance
Balance at beginning of period	1,179	1,643	6,712
Provision for unrealized losses	104	79	357
Reductions taken on sales	(427)	(543)	(5,426)
Balance at end of period	856	1,179	1,643
Expenses related to foreclosed assets, net of lease revenue
Gain on sales, net	(163)	(41)	(204)
Provision for unrealized losses	104	79	357
Operating expenses	193	133	535
Less: Lease revenue	4	4	37
Net OREO expense	$ 130	$ 167	$ 651

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Premises and equipment
Cost	$ 144,789	$ 161,545
Accumulated Depreciation/Amortization	72,434	73,540
Net Book Value	72,355	88,005
Other Assets
Premises and equipment
Assets held for sale	4,600	0
Land
Premises and equipment
Cost	29,741	42,375
Net Book Value	29,741	42,375
Buildings
Premises and equipment
Cost	54,075	59,313
Accumulated Depreciation/Amortization	24,427	26,959
Net Book Value	29,648	32,354
Leasehold improvements
Premises and equipment
Cost	2,790	2,324
Accumulated Depreciation/Amortization	1,280	1,004
Net Book Value	1,510	1,320
Furniture and equipment
Premises and equipment
Cost	58,183	57,533
Accumulated Depreciation/Amortization	46,727	45,577
Net Book Value	$ 11,456	$ 11,956

Deposits - Classifications of D

Deposits - Classifications of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deposits
Noninterest bearing demand	$ 2,051,702	$ 2,087,649
Savings	1,145,592	1,178,542
NOW accounts	609,338	593,259
Money market accounts	862,170	1,102,972
Certificates of deposit of less than $100,000	244,017	296,298
Certificates of deposit of $100,000 through $250,000	157,438	138,794
Certificates of deposit of more than $250,000	40,466	68,718
Total deposits	$ 5,110,723	$ 5,466,232

Deposits - Scheduled maturities

Deposits - Scheduled maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deposits
Time	$ 441,921	$ 503,810
Brokered certificates
Brokered certificates of deposit	37,000	10,100
Deposits held by senior officers and directors, including their related interests	13,800	26,800
Time Deposit Maturities
2023	310,978
2024	71,879
2025	35,870
2026	17,191
2027	6,003
Total	$ 441,921	$ 503,810

Borrowings - Summary (Details)

Borrowings - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Borrowings
Total borrowings	$ 260,811	$ 198,876
Securities sold under repurchase agreements
Borrowings
Total borrowings	32,156	50,337
Other short-term borrowings
Borrowings
Total borrowings	90,000
Junior subordinated debentures
Borrowings
Total borrowings	25,773	25,773
Subordinated debentures
Borrowings
Total borrowings	59,297	59,212
Senior notes
Borrowings
Total borrowings	44,585	44,480
Notes payable and other borrowings
Borrowings
Total borrowings	$ 9,000	$ 19,074

Borrowings - Additional informa

Borrowings - Additional information (Details)		3 Months Ended			12 Months Ended
	Feb. 24, 2020 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2016	Dec. 31, 2022 USD ($) item	Dec. 31, 2021 USD ($)	Dec. 31, 2018 USD ($)
Borrowings
Securities available-for-sale, at fair value					$ 1,539,359,000	$ 1,693,632,000
Threshold percentage of stockholders' equity					10%
Borrowings at FHLBC as percentage of total assets					35%
FHLBC stock					$ 5,600,000	7,100,000
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock					20,530,000	13,257,000
Proceeds from term note	$ 30,000,000
Cash distribution rate of trust preferred securities (as a percent)	7.80%
Senior notes					44,585,000	44,480,000
Basis points added to reference rate (as a percent)	175%
Outstanding, net of deferred issuance costs					59,300,000	59,200,000
Debt issuance costs					1,000	1,000
Total borrowings					260,811,000	198,876,000
Asset Pledged as Collateral with Right | Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars					71,400,000	113,000,000
GCFC/ABC Bank
Borrowings
Debt assumed							$ 23,400,000
Balance of borrowings paid off		$ 5,900,000
Securities sold under repurchase agreements
Borrowings
Investment securities pledged with financial institutions, dollars					$ 32,200,000	50,300,000
Number of customers having secured balances exceeding specified percentage of stockholders equity | item					0
Total borrowings					$ 32,156,000	50,337,000
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					$ 90,000,000	0
FHLBC stock					5,600,000	7,100,000
Principal balance of loans collateralized					969,100,000	572,600,000
Maximum borrowing capacity						603,100,000
Amount available for additional borrowings					513,100,000
Subordinated debentures
Borrowings
Total borrowings					59,297,000	59,212,000
Notes Payable to Banks [Member]
Borrowings
Total borrowings					9,000,000	19,074,000
Junior subordinated debentures
Borrowings
Total borrowings					$ 25,773,000	25,773,000
Senior Notes [Member]
Borrowings
Interest rate (as a percent)					5.75%
Senior notes					$ 44,600,000	44,500,000
Debt Instrument, Term				10 years
Interest rate term					5 years
Effective interest rate					8.62%
Debt issuance costs					$ 415,000	520,000
Amortization period for deferred financing costs					10 years
Total borrowings					$ 44,585,000	$ 44,480,000
Debt instrument redemption price, percentage					100%
Senior Notes [Member] | Debt Instrument, Variable Rate Base LIBOR [Member]
Borrowings
Basis points added to reference rate (as a percent)					385%
Term Debt
Borrowings
Proceeds from term note	$ 20,000,000				$ 9,000,000
Effective interest rate					6.14%
Debt term					3 years
Subordinated Notes Due 2031
Borrowings
Interest rate (as a percent)			3.50%
Face amount			$ 60,000,000
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, 2022	Dec. 31, 2021
Scheduled maturities and weighted average rates of borrowings
Year one	$ 131,156	$ 58,337
Year two		9,000
Year four	44,585
Year five		46,554
Thereafter	85,070	84,985
Total borrowings	$ 260,811	$ 198,876
Weighted Average Rate
Year one (as a percent)	2.89%	0.37%
Year two (as a percent)		1.85%
Year four (as a percent)	6.02%
Year five (as a percent)		5.88%
Thereafter (as a percent)	3.91%	3.89%
Total borrowings (as a percent)	3.76%	3.23%

Junior Subordinated Debentures

Junior Subordinated Debentures - Issuance (Details) - USD ($) $ in Thousands		1 Months Ended	6 Months Ended	7 Months Ended	12 Months Ended
	Feb. 24, 2020	Apr. 30, 2007	Jun. 15, 2017	Dec. 31, 2017	Dec. 31, 2022	Dec. 31, 2021
Junior subordinated debentures
Cash distribution rate of trust preferred securities (as a percent)	7.80%
Junior subordinated debentures					$ 25,773	$ 25,773
Junior Subordinated Debentures issuance cost					$ 1	$ 1
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%
Cash distribution, floating rate base					three-month LIBOR
Junior subordinated debentures | Old Second Capital Trust I
Junior subordinated debentures
Interest rate (as a percent)					4.42%	4.36%
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of income tax expense (benefit)
Current federal	$ 13,241	$ 750	$ 6,269
Current state	6,209	594	3,960
Deferred federal	3,338	4,445	(135)
Deferred state	1,356	2,034	(511)
Total tax at effective tax rate	24,144	7,823	$ 9,583
Deferred tax assets
Accrued Bonus	2,700	1,362
Allowance for credit losses	15,591	14,636
Deferred compensation	1,292	1,293
Goodwill amortization/impairment		919
Stock based compensation	1,257	911
Business combination adjustments	1,138	882
Federal recognized built-in loss ("RBIL") carryforward		493
Other assets	1,621	1,173
Total deferred tax assets	23,599	21,669
Deferred tax liabilities
Accumulated depreciation on premises and equipment	(4,107)	(1,636)
Goodwill amortization/impairment	(229)
Mortgage servicing rights	(3,103)	(1,982)
Amortization of core deposit intangible	(3,673)	(4,269)
Acquired Securities	(1,921)	(2,458)
Other liabilities	(2,025)	(1,814)
Total deferred tax liabilities	(15,058)	(12,159)
Net deferred tax asset before adjustments related to other comprehensive income	8,541	9,510
Tax effect of adjustments related to other comprehensive loss	36,209	(3,410)
Net deferred tax asset	44,750	$ 6,100
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, 2022	Dec. 31, 2021	Dec. 31, 2020
Difference between effective tax rates and federal statutory rates applied to financial statement income
Tax at statutory federal income tax rate	$ 19,225	$ 5,852	$ 7,856
Nontaxable interest income, net of disallowed interest deduction	(1,097)	(1,069)	(1,067)
BOLI Income	(151)	(292)	(271)
State income taxes, net of federal benefit	6,091	2,054	2,570
Stock based compensation	(43)	54	297
Transaction costs		396
Other, net	119	828	198
Total tax at effective tax rate	$ 24,144	$ 7,823	$ 9,583

Equity Compensation Plans (Deta

Equity Compensation Plans (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	May 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	May 31, 2019
Equity Compensation Plans
Total compensation cost		$ 3	$ 1.4	$ 2.1
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		1,165,811
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, 2022	Dec. 31, 2021
Changes in unvested awards
Nonvested at the beginning of the period (in shares)	540,306
Granted (in shares)	279,838	274,881
Vested (in shares)	(153,790)
Forfeited (in shares)	(17,144)
Nonvested at the end of the period (in shares)	649,210	540,306
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 12.04
Granted (in dollars per share)	14.29
Vested (in dollars per share)	12.73
Forfeited (in dollars per share)	12.49
Nonvested at the end of the period (in dollars per share)	$ 12.84	$ 12.04
Additional information
Total unrecognized compensation cost of restricted awards	$ 3.9
Expected weighted-average period for recognition of unrecognized compensation	1 year 10 months 9 days

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Basic earnings per share:
Weighted-average common shares outstanding	44,526,655	30,208,663	29,623,333
Net income	$ 67,405	$ 20,044	$ 27,825
Basic earnings per share	$ 1.51	$ 0.66	$ 0.94
Diluted earnings per share:
Weighted-average common shares outstanding	44,526,655	30,208,663	29,623,333
Diluted average common shares outstanding	45,213,088	30,737,862	30,174,072
Diluted earnings per share	$ 1.49	$ 0.65	$ 0.92
Restricted Stock and Restricted Stock Units [Member]
Diluted earnings per share:
Dilutive effect of share-based payment awards (in shares)	686,433	529,199	550,739

Commitments - Summary of Financ

Commitments - Summary of Financial Instrument Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Fixed Letters of Credit
Financial instrument commitments
Financial instrument commitments	$ 6,675	$ 840
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	6,675	840
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	3,514	384
Fixed Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	3,161	456
Fixed Letters of Credit | Unused lines of Credit
Financial instrument commitments
Loan commitments	139,070	84,225
Variable Letters of Credit
Financial instrument commitments
Financial instrument commitments	29,421	32,448
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	29,354	32,381
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	15,365	17,474
Variable Letters of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	13,989	14,907
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	860,255	895,665
Letter of Credit
Financial instrument commitments
Financial instrument commitments	36,096	33,288
Letter of Credit | Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	36,029	33,221
Letter of Credit | Commitments to Extend Credit to Borrowers [Member] | Financial Standby Letter of Credit
Financial instrument commitments
Financial instrument commitments	18,879	17,858
Letter of Credit | Commitments to Extend Credit to Borrowers [Member] | Performance Guarantee
Financial instrument commitments
Financial instrument commitments	17,150	15,363
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	$ 999,325	$ 979,890

Commitments - Lease Commitments

Commitments - Lease Commitments and Legal Proceedings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Estimated aggregate minimum annual rental commitments
2023	$ 1,460,000
2024	1,543,000
2025	1,792,000
2026	1,595,000
2027	1,631,000
2028 and Thereafter	10,036,000
Aggregate future minimum rental income receivable under noncancelable leases	572,000
Total facility net operating lease revenue/expense	396,000	$ 361,000	$ 223,000
Total ATM lease expense	$ 1,900,000	$ 1,200,000	$ 1,000,000

Regulatory & Capital Matters (D

Regulatory & Capital Matters (Details) $ in Millions	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.0814	0.0781
Risk-based capital ratio (as a percent)	0.1252	0.1255
Phase out of impact of allowance for credit loss	$ 3.8
Deferment of impact on retained earnings	$ 2.9
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	0.0932	0.0958
Risk-based capital ratio (as a percent)	0.1275	0.1346
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, 2022	Dec. 31, 2021
Common equity tier 1 capital to risk weighted assets
Actual	$ 457,206	$ 394,421
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 330,966	$ 291,855
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.0967%	0.0946%
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	$ 592,039	$ 522,932
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 496,518	$ 437,513
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	0.1252	0.1255
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	$ 482,206	$ 419,421
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 401,838	$ 354,382
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1020	0.1006
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	$ 482,206	$ 419,421
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 236,956	$ 214,812
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	0.0814	0.0781
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	$ 552,404	$ 514,992
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	330,498	290,487
Minimum Required to Be Well Capitalized	$ 306,891	$ 269,738
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.117%	0.1241%
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	$ 602,237	$ 558,503
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	495,960	435,682
Minimum Required to Be Well Capitalized	$ 472,343	$ 414,935
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	0.1275	0.1346
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	$ 552,404	$ 514,992
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	401,319	352,734
Minimum Required to Be Well Capitalized	$ 377,712	$ 331,985
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	0.1170	0.1241
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	$ 552,404	$ 514,992
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	237,083	215,028
Minimum Required to Be Well Capitalized	$ 296,354	$ 268,785
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	0.0932	0.0958
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) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
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	$ 18.5
Percentage of increase in the allowance for credit losses	25%

Mortgage Banking Derivatives (D

Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 76,600
Proceeds from sale of loan to investors	81,776	$ 254,374	$ 388,538
Gain on sale of loan	2,022	9,300	$ 15,519
Federal National Mortgage Association [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 62,400
Federal National Mortgage Association [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	76.50%
Federal Home Loan Mortgage Corporation [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 7,900
Federal Home Loan Mortgage Corporation [Member] | Customer Concentration Risk | Loan receivables
Mortgage Banking Derivatives
Percentage of concentration risk	9.70%
Not Designated as Hedging Instrument | Forward Contracts [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	$ 2,750	20,000
Fair value	20	17
Not Designated as Hedging Instrument | Interest Rate Lock Commitments [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	2,548	14,414
Fair value	$ 56	$ 491

Fair Value Measurements (Detail

Fair Value Measurements (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)
Fair Value Measurements
Fair value transfer assets into level 3	$ 0

Fair Value Measurements - Recur

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Assets:
Securities available-for-sale	$ 1,539,359	$ 1,693,632
Mortgage servicing rights	$ 11,189	7,097
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	$ 212,129	202,339
U.S. government agencies
Assets:
Securities available-for-sale	56,048	61,888
States and political subdivisions
Assets:
Securities available-for-sale	226,128	257,609
Corporate bonds
Assets:
Securities available-for-sale	9,622	9,887
Collateralized mortgage obligations
Assets:
Securities available-for-sale	533,768	672,967
Asset-backed Securities
Assets:
Securities available-for-sale	201,928	236,877
Collateralized loan obligations.
Assets:
Securities available-for-sale	174,746	79,763
Fair Value, Inputs, Level 1 [Member]
Assets:
Securities available-for-sale	212,129	202,339
Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	1,291,219	1,476,057
Loans held-for-sale	491	4,737
Other assets	6,391	3,494
Liabilities:
Other liabilities	12,264	6,788
Fair Value, Inputs, Level 3 [Member]
Assets:
Securities available-for-sale	36,011	15,236
Mortgage servicing rights	11,189	7,097
Fair Value, Measurements, Recurring [Member]
Assets:
Securities available-for-sale	491
Loans held-for-sale		4,737
Mortgage servicing rights	11,189	7,097
Total financial assets	1,557,631	1,709,468
Liabilities:
Total	12,265	6,809
Fair Value, Measurements, Recurring [Member] | Interest rate swap agreements, including risk participation agreement
Assets:
Securities available-for-sale	6,516
Other assets		3,494
Liabilities:
Other liabilities	12,265	6,809
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Assets:
Securities available-for-sale	76
Other assets		508
Fair Value, Measurements, Recurring [Member] | U.S. Treasury
Assets:
Securities available-for-sale	212,129	202,339
Fair Value, Measurements, Recurring [Member] | U.S. government agencies
Assets:
Securities available-for-sale	56,048	61,888
Fair Value, Measurements, Recurring [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	124,990	172,302
Fair Value, Measurements, Recurring [Member] | States and political subdivisions
Assets:
Securities available-for-sale	226,128	257,609
Fair Value, Measurements, Recurring [Member] | Corporate bonds
Assets:
Securities available-for-sale	9,622	9,887
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations
Assets:
Securities available-for-sale	533,768	672,967
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	201,928	236,877
Fair Value, Measurements, Recurring [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	174,746	79,763
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Total financial assets	212,129	202,339
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | U.S. Treasury
Assets:
Securities available-for-sale	212,129	202,339
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	491
Loans held-for-sale		4,737
Total financial assets	1,298,302	1,484,796
Liabilities:
Total	12,265	6,809
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest rate swap agreements, including risk participation agreement
Assets:
Securities available-for-sale	6,516
Other assets		3,494
Liabilities:
Other liabilities	12,265	6,809
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Assets:
Securities available-for-sale	76
Other assets		508
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. government agencies
Assets:
Securities available-for-sale	56,048	61,888
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Mortgage Backed Securities, Issued by US Government Agencies
Assets:
Securities available-for-sale	124,990	172,302
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	211,899	242,373
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate bonds
Assets:
Securities available-for-sale	9,622	9,887
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations
Assets:
Securities available-for-sale	526,998	672,967
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Asset-backed Securities
Assets:
Securities available-for-sale	186,916	236,877
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized loan obligations.
Assets:
Securities available-for-sale	174,746	79,763
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets:
Mortgage servicing rights	11,189	7,097
Total financial assets	47,200	22,333
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | States and political subdivisions
Assets:
Securities available-for-sale	14,229	$ 15,236
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 ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes in Level 3
Transfers into Level 3		$ 0
Asset-backed Securities
Changes in Level 3
Transfers into Level 3	$ 15,012,000
Transfers out of Level 3	15,000,000
Purchases, issuances, sales, and settlements
Ending balance	15,012,000
Collateralized loan obligations.
Changes in Level 3
Transfers into Level 3	6,770,000
Transfers out of Level 3	6,800,000
Purchases, issuances, sales, and settlements
Ending balance	6,770,000
States and political subdivisions
Changes in Level 3
Beginning balance	15,236,000	4,319,000
Total gains or losses
Included in earnings (or changes in net assets)	(136,000)	(20,000)
Included in other comprehensive income (loss)	(86,000)	801,000
Purchases, issuances, sales, and settlements
Purchases	519,000	11,063,000
Settlements	(1,304,000)	(927,000)
Ending balance	14,229,000	15,236,000
Mortgage Servicing Rights [Member]
Changes in Level 3
Beginning balance	7,097,000	4,224,000
Total gains or losses
Included in earnings (or changes in net assets)	4,106,000	2,420,000
Purchases, issuances, sales, and settlements
Issuances	915,000	1,612,000
Settlements	(929,000)	(1,159,000)
Ending balance	$ 11,189,000	$ 7,097,000

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative and Qualitative Information (Details)	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2022 USD ($)
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 7,097,000	$ 11,189,000
Securities available-for-sale, at fair value	1,693,632,000	1,539,359,000
Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	11,189,000
Securities available-for-sale, at fair value	15,236,000	36,011,000
Asset-backed Securities
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	236,877,000	201,928,000
States and political subdivisions
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	257,609,000	226,128,000
Collateralized mortgage obligations
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	672,967,000	533,768,000
Fair Value, Measurements, Recurring [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	11,189,000
Securities available-for-sale, at fair value		491,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	7,097,000	11,189,000
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value		6,516,000
Fair Value, Measurements, Recurring [Member] | Asset-backed Securities
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	236,877,000	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	257,609,000	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	15,236,000	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	672,967,000	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
Mortgage servicing rights, 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
Servicing Asset, 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
Servicing Asset, 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
Servicing Asset, 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	$ 7,097,000	$ 11,189,000
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	11	9
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	15	11
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	11	9
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
Mortgage servicing rights, fair value	$ 15,236,000	$ 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
Servicing Asset, Measurement Input		2.3
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
Servicing Asset, Measurement Input		5.8
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
Servicing Asset, Measurement Input	2.8	4.4
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Collateralized mortgage obligations | 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		$ 6,770,000
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Collateralized mortgage obligations | 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		7
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Collateralized mortgage obligations | 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		7
Fair Value, Measurements, Recurring [Member] | Measurement Input, Discount Rate | Collateralized mortgage obligations | 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		7
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	0	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	36.6	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	11.9	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
Servicing Asset, Measurement Input		0.3
Liquidity Premium (as a percent)	0.30%
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
Servicing Asset, Measurement Input		0.5
Liquidity Premium (as a percent)	2.40%
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
Servicing Asset, Measurement Input		0.5
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	0.6

Fair Value Measurements - Nonre

Fair Value Measurements - Nonrecurring (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets and liabilities measured at fair value
Valuation allowance	$ 17,600,000	$ 5,400,000
Valuation allowance	65,300,000	18,500,000
Increase (decrease) of specific allocations within the provision for loan losses		2,700,000
Carrying value of other real estate owned	1,561,000	2,356,000	$ 2,474,000	$ 5,004,000
OREO Valuation allowance	856,000	1,179,000	$ 1,643,000	$ 6,712,000
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value
Total	49,261,000	15,494,000
Fair Value, Measurements, Nonrecurring [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	47,700,000	13,138,000
Valuation allowance	65,300,000
Increase (decrease) of specific allocations within the provision for loan losses	12,200,000
Fair Value, Measurements, Nonrecurring [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	1,561,000	2,356,000
Carrying value of other real estate owned	1,600,000	2,400,000
Purchase accounting adjustments	131,000	131,000
Outstanding balance	2,500,000	3,700,000
OREO Valuation allowance	856,000,000,000	1,200,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member]
Assets and liabilities measured at fair value
Total	49,261,000	15,494,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	47,700,000	13,138,000
Fair Value, Measurements, Nonrecurring [Member] | Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	$ 1,561,000	$ 2,356,000

Fair Values of Financial Inst_3

Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financial assets:
Cash and due from banks	$ 56,632	$ 38,565
Interest earning deposits with financial institutions	58,545	713,542
Securities available-for-sale	1,539,359	1,693,632
FHLBC and FRBC Stock	20,530	13,257
Mortgage servicing rights	11,189	7,097
Financial liabilities:
Noninterest bearing deposits	2,051,702	2,087,649
Other short-term borrowings	90,000
Junior subordinated debentures	25,773	25,773
Senior notes	44,585	44,480
Reported Value Measurement
Financial assets:
Cash and due from banks	56,632	38,565
Interest earning deposits with financial institutions	58,545	713,542
Securities available-for-sale	1,539,359	1,693,632
FHLBC and FRBC Stock	20,530	13,257
Loans held for sale	491	4,737
Net loans	3,820,129	3,376,523
Mortgage servicing rights	11,189	7,097
Interest rate swap agreements	6,391	3,494
Interest rate lock commitments and forward contracts	76	508
Interest receivable on securities and loans	22,661	13,431
Financial liabilities:
Noninterest bearing deposits	2,051,702	2,087,649
Interest bearing deposits	3,059,021	3,378,583
Securities sold under repurchase agreements	32,156	50,337
Other short-term borrowings	90,000
Junior subordinated debentures	25,773	25,773
Subordinated debentures	59,297	59,212
Senior notes	44,585	44,480
Note payable and other borrowings	9,000	19,074
Interest rate swap agreements	12,264	6,788
Interest payable on deposits and borrowings	1,657	1,706
Estimate of Fair Value Measurement
Financial assets:
Cash and due from banks	56,632	38,565
Interest earning deposits with financial institutions	58,545	713,542
Securities available-for-sale	1,539,359	1,693,632
FHLBC and FRBC Stock	20,530	13,257
Loans held for sale	491	4,737
Net loans	3,681,387	3,407,596
Mortgage servicing rights	11,189	7,097
Interest rate swap agreements	6,391	3,494
Interest rate lock commitments and forward contracts	76	508
Interest receivable on securities and loans	22,661	13,431
Financial liabilities:
Noninterest bearing deposits	2,051,702	2,087,649
Interest bearing deposits	3,042,740	3,375,930
Securities sold under repurchase agreements	32,156	50,337
Other short-term borrowings	90,000
Junior subordinated debentures	21,907	18,557
Subordinated debentures	52,322	60,111
Senior notes	44,248	44,480
Note payable and other borrowings	8,984	19,411
Interest rate swap agreements	12,264	6,788
Interest payable on deposits and borrowings	1,657	1,706
Fair Value, Inputs, Level 1
Financial assets:
Cash and due from banks	56,632	38,565
Interest earning deposits with financial institutions	58,545	713,542
Securities available-for-sale	212,129	202,339
Financial liabilities:
Noninterest bearing deposits	2,051,702	2,087,649
Senior notes	44,248	44,480
Fair Value, Inputs, Level 2
Financial assets:
Securities available-for-sale	1,291,219	1,476,057
FHLBC and FRBC Stock	20,530	13,257
Loans held for sale	491	4,737
Interest rate swap agreements	6,391	3,494
Interest rate lock commitments and forward contracts	76	508
Interest receivable on securities and loans	22,661	13,431
Financial liabilities:
Interest bearing deposits	3,042,740	3,375,930
Securities sold under repurchase agreements	32,156	50,337
Other short-term borrowings	90,000
Junior subordinated debentures	21,907	18,557
Subordinated debentures	52,322	60,111
Note payable and other borrowings	8,984	19,411
Interest rate swap agreements	12,264	6,788
Interest payable on deposits and borrowings	1,657	1,706
Fair Value, Inputs, Level 3
Financial assets:
Securities available-for-sale	36,011	15,236
Net loans	3,681,387	3,407,596
Mortgage servicing rights	$ 11,189	$ 7,097

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, 2022 USD ($) item	Dec. 31, 2021 USD ($) item
Two financial institutions
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Cash collateral pledged with financial institutions, dollars	$ 11,200,000
Number of financial institutions in which cash collateral pledged | item	2
One financial institutions
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Cash collateral pledged with financial institutions, dollars		$ 17,200,000
Number of financial institutions in which cash collateral pledged | item		1
Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Investment securities pledged with financial institutions, dollars	$ 0	$ 0
Number of financial institutions in which cash collateral pledged	5,300,000	180,000,000
Designated as Hedging Instrument
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value	$ 2,737,000	$ 808,000
Derivative liabilities designated as hedging instruments, fair value	$ 8,610,000	$ 4,102,000
Designated as Hedging Instrument | Interest Rate Products | OSBC Affiliates
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	4	2
Notional amount	$ 275,774,000	$ 75,774,000
Derivative assets designated as hedging instruments, fair value	2,737,000	808,000
Derivative liabilities designated as hedging instruments, fair value	8,610,000	4,102,000
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	250,000,000	50,000,000
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
Not Designated as Hedging Instrument
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative assets designated as hedging instruments, fair value	3,855,000	3,194,000
Derivative liabilities designated as hedging instruments, fair value	$ 3,655,000	$ 2,707,000
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	21	26
Notional amount	$ 110,647,000	$ 165,005,000
Derivative assets designated as hedging instruments, fair value	3,654,000	2,686,000
Derivative liabilities designated as hedging instruments, fair value	3,654,000	2,686,000
Not Designated as Hedging Instrument | Interest Rate Swap [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	110,600,000	165,000,000
Not Designated as Hedging Instrument | Commitments.
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	$ 5,300,000	$ 34,400,000
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	28	87
Notional amount	$ 5,298,000	$ 34,414,000
Derivative assets designated as hedging instruments, fair value	$ 76,000	$ 508,000
Not Designated as Hedging Instrument | Other Contracts
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Derivative, number of transactions | item	4	3
Notional amount	$ 43,699,000	$ 17,173,000
Derivative assets designated as hedging instruments, fair value	125,000
Derivative liabilities designated as hedging instruments, fair value	1,000	21,000
Not Designated as Hedging Instrument | Forward Contracts [Member]
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Notional amount	2,750,000	$ 20,000,000
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	5,200,000
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	$ 563,000

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Financial Instruments with Off-Balance Sheet Risk and Derivative Transactions
Amount of gain reclassified from AOCI to interest income	$ 4,200,000	$ 2,400,000	$ 2,700,000
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 373,000	$ 56,000	$ 57,000

Preferred Stock (Details)

Preferred Stock (Details) - shares	Dec. 31, 2022	Dec. 31, 2021
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, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets
Other assets	$ 56,012	$ 60,439
Total assets	5,888,317	6,212,189
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,297	59,212
Senior notes	44,585	44,480
Other liabilities	55,642	45,054
Stockholders' equity	461,141	502,027	$ 307,087	$ 277,864
Total liabilities and stockholders' equity	5,888,317	6,212,189
Parent Company
Assets
Noninterest bearing deposit with bank subsidiary	39,167	25,112
Investment in subsidiaries	555,140	626,325
Other assets	6,526	1,111
Total assets	600,833	652,548
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	25,773
Subordinated debt	59,297	59,212
Senior notes	44,585	44,480
Notes Payable	9,000	13,000
Other liabilities	1,037	8,056
Stockholders' equity	461,141	502,027
Total liabilities and stockholders' equity	$ 600,833	$ 652,548

Parent Company Condensed Fina_4

Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Expenses
Junior subordinated debentures	$ 1,136	$ 1,133	$ 2,215
Subordinated debt	2,185	1,610
Senior notes	2,682	2,692	2,692
Income before income taxes and equity in undistributed net income of subsidiaries	91,549	27,867	37,408
Income tax benefit	24,144	7,823	9,583
Net income available to common stockholders	67,405	20,044	27,825
Parent Company
Operating Income
Cash dividends received from subsidiaries	40,000	40,000	41,300
Other income	29	15	32
Total operating income	40,029	40,015	41,332
Operating Expenses
Junior subordinated debentures	1,136	1,133	2,216
Subordinated debt	2,185	1,610
Senior notes	2,682	2,692	2,693
Notes payable	385	291	362
Other expenses	5,086	6,918	3,669
Total operating expense	11,474	12,644	8,940
Income before income taxes and equity in undistributed net income of subsidiaries	28,555	27,371	32,392
Income tax benefit	(3,216)	(2,986)	(2,215)
Income before equity in undistributed net income of subsidiaries	31,771	30,357	34,607
Equity in undistributed net income of subsidiaries	35,634	(10,313)	(6,782)
Net income available to common stockholders	$ 67,405	$ 20,044	$ 27,825

Parent Company Condensed Fina_5

Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash Flows from Operating Activities
Net Income	$ 67,405	$ 20,044	$ 27,825
Adjustments to reconcile net income to net cash from operating activities:
Change in taxes payable	12,048	(9,286)	811
Stock-based compensation	2,960	1,435	2,089
Net cash provided by operating activities	97,344	31,047	25,987
Cash Flows from Investing Activities
Cash paid for acquisition, net of cash and cash equivalents retained	(146)	148,995
Net cash used in investing activities	(432,778)	132,918	(103,808)
Cash Flows from Financing Activities
Dividends paid on common stock	(8,877)	(4,612)	(1,186)
Purchases of treasury stock	(455)	(10,417)	(5,922)
Redemption of junior subordinated debentures			(32,604)
Issuance of term note			20,000
Issuance of sub debt		59,148
Repayment of term note	(6,056)	(315)	(307)
Net cash (used in) provided by financing activities	(301,496)	258,239	357,092
Net change in cash and cash equivalents	(636,930)	422,204	279,271
Cash and cash equivalents at beginning of year	752,107	329,903	50,632
Cash and cash equivalents at end of year	115,177	752,107	329,903
Parent Company
Cash Flows from Operating Activities
Net Income	67,405	20,044	27,825
Adjustments to reconcile net income to net cash from operating activities:
Equity in undistributed net income of subsidiaries	(35,634)	10,313	6,782
Provision for deferred tax expense (benefit)	91	(248)	(514)
Change in taxes payable	(4,694)	(695)	5,933
Change in other assets	12	(12)	954
Stock-based compensation	2,960	1,435	2,089
Other, net	(2,753)	961	682
Net cash provided by operating activities	27,387	31,798	43,751
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
Dividends paid on common stock	(8,877)	(4,612)	(1,186)
Purchases of treasury stock	(455)	(10,417)	(5,922)
Redemption of junior subordinated debentures			(32,604)
Issuance of term note			20,000
Issuance of sub debt		59,148
Repayment of term note	(4,000)	(4,000)	(3,000)
Net cash (used in) provided by financing activities	(13,332)	40,119	(22,712)
Net change in cash and cash equivalents	14,055	(22,489)	21,039
Cash and cash equivalents at beginning of year	25,112	47,601	26,562
Cash and cash equivalents at end of year	$ 39,167	$ 25,112	$ 47,601

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended			36 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2022
Employee Benefit Plans
Expense relating to the 401(k) plan	$ 2	$ 1.4	$ 1.2
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%