Old Second Bancorp (OSBC) 10-K8 Mar 212020 FY Annual reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
Document and Entity Information - USD ($) $ in Millions	Dec. 31, 2020	Mar. 04, 2021	Jun. 30, 2020
Document and Entity Information
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2020
Entity File Number	0-10537
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			$ 224.8
Entity Common Stock, Shares Outstanding		29,125,741
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Entity Central Index Key	0000357173
Amendment Flag	false

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Cash and due from banks	$ 24,306	$ 34,096
Interest bearing deposits with financial institutions	305,597	16,536
Cash and cash equivalents	329,903	50,632
Securities available-for-sale, at fair value	496,178	484,648
Federal Home Loan Bank Chicago ("FHLBC") and Federal Reserve Bank Chicago ("FRBC") stock	9,917	9,917
Loans held-for-sale	12,611	3,061
Loans	2,034,851	1,930,812
Less: allowance for loan losses	33,855	19,789
Net loans	2,000,996	1,911,023
Premises and equipment, net	45,477	44,354
Other real estate owned	2,474	5,004
Mortgage servicing rights, net	4,224	5,935
Goodwill and core deposit intangible	20,781	21,275
Bank-owned life insurance (BOLI)	63,102	61,763
Deferred tax assets, net	8,121	11,459
Other assets	47,053	26,474
Total assets	3,040,837	2,635,545
Deposits:
Noninterest bearing demand	909,505	669,795
Interest bearing:
Savings, NOW, and money market	1,202,134	1,015,285
Time	425,434	441,669
Total deposits	2,537,073	2,126,749
Securities sold under repurchase agreements	66,980	48,693
Other short-term borrowings		48,500
Junior subordinated debentures	25,773	57,734
Senior notes	44,375	44,270
Notes payable and other borrowings	23,393	6,673
Other liabilities	36,156	25,062
Total liabilities	2,733,750	2,357,681
Stockholders' Equity
Common stock	34,957	34,854
Additional paid-in capital	122,212	120,657
Retained earnings	236,579	213,723
Accumulated other comprehensive (loss) income	14,762	4,562
Treasury stock	(101,423)	(95,932)
Total stockholders' equity	307,087	277,864
Total liabilities and stockholders' equity	$ 3,040,837	$ 2,635,545

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
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	34,957,384	34,853,757
Common stock, Shares outstanding	29,328,723	29,931,809
Treasury stock, Shares	5,628,661	4,921,948

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
Consolidated Statements of Income - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and Dividend Income
Loans, including fees	$ 90,923	$ 97,719	$ 88,769
Loans held-for-sale	306	133	127
Securities:
Taxable	6,773	9,256	9,577
Tax exempt	5,471	7,425	8,341
Dividends from FHLBC and FRBC stock	484	602	469
Interest bearing deposits with financial institutions	258	459	334
Total interest and dividend income	104,215	115,594	107,617
Interest Expense
Savings, NOW, and money market deposits	1,569	2,960	2,156
Time deposits	5,033	6,736	5,829
Securities sold under repurchase agreements	202	577	462
Other short-term borrowings	179	1,755	1,429
Junior subordinated debentures	2,215	3,724	3,716
Senior notes	2,692	2,699	2,688
Notes payable and other borrowings	574	384	398
Total interest expense	12,464	18,835	16,678
Net interest and dividend income	91,751	96,759	90,939
Provision for credit losses	10,413	1,600	1,228
Net interest and dividend income after provision for loan and lease losses	81,338	95,159	89,711
Noninterest Income
Mortgage servicing rights mark to market loss	(3,999)	(2,662)	(734)
Net gain on sales of mortgage loans	15,519	5,112	3,791
Securities gains (losses), net	(25)	4,511	360
Change in cash surrender value of BOLI	1,233	1,415	984
Death benefit realized on BOLI	57	872	1,026
Debit card interchange income	5,532	5,861	5,663
Gains (losses) on disposal and transfer of fixed assets, net		32
Other income	3,645	3,636	3,883
Total noninterest income	37,487	35,800	31,353
Noninterest Expense
Salaries and employee benefits	49,547	46,869	44,161
Occupancy, furniture and equipment	8,498	8,289	6,915
Computer and data processing	5,143	5,631	6,745
FDIC insurance	597	176	653
General bank insurance	1,030	1,002	1,040
Amortization of core deposit intangible	494	539	387
Advertising expense	298	1,225	1,567
Debit card interchange expense	2,195	1,956	1,985
Legal fees	761	675	835
Other real estate expense, net	651	423	396
Other expense	12,203	12,317	12,444
Total noninterest expense	81,417	79,102	77,128
Income before income taxes	37,408	51,857	43,936
Provision for income taxes	9,583	12,402	9,924
Net income available to common stockholders	$ 27,825	$ 39,455	$ 34,012
Basic earnings per share (in dollars per share)	$ 0.94	$ 1.32	$ 1.14
Diluted earnings per share (in dollars per share)	0.92	1.30	1.12
Dividends declared per share (in dollars per share)	$ 0.04	$ 0.04	$ 0.04
Trust Income
Noninterest Income
Service charges on deposits	$ 6,409	$ 6,655	$ 6,417
Bank Servicing
Noninterest Income
Service charges on deposits	5,512	7,715	7,328
Secondary mortgage fees
Noninterest Income
Service charges on deposits	1,654	772	696
Mortgage Servicing
Noninterest Income
Service charges on deposits	$ 1,950	$ 1,881	$ 1,939

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Consolidated Statements of Comprehensive Income
Net Income	$ 27,825	$ 39,455	$ 34,012
Unrealized holding (losses) gains on available-for-sale securities arising during the period	14,690	19,630	(9,053)
Related tax benefit (expense)	(4,122)	(5,521)	2,554
Holding (losses) gains after tax on available-for-sale securities	10,568	14,109	(6,499)
Less: Reclassification adjustment for the net gains (losses) realized during the period
Net realized gains (losses)	(25)	4,511	360
Related tax (expense) benefit	7	(1,267)	(100)
Net realized gains (losses) after tax	(18)	3,244	260
Other comprehensive (loss) income on available-for-sale securities	10,586	10,865	(6,759)
Changes in fair value of derivatives used for cashflow hedges	(533)	(3,092)	1,230
Related tax (expense) benefit	147	868	(348)
Other comprehensive income on cashflow hedges	(386)	(2,224)	882
Total other comprehensive (loss) income	10,200	8,641	(5,877)
Total comprehensive income	$ 38,025	$ 48,096	$ 28,135

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
Consolidated Statements of Cash Flows - USD ($)	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities
Net Income	$ 27,825,000	$ 39,455,000	$ 34,012,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Net premium amortization/discount (accretion) on securities	2,329,000	2,726,000	2,969,000
Securities (gains) losses, net	25,000	(4,511,000)	(360,000)
Provision for credit losses	10,413,000	1,600,000	1,228,000
Originations of loans held-for-sale	(384,379,000)	(164,696,000)	(133,930,000)
Proceeds from sales of loans held-for-sale	388,538,000	168,472,000	137,622,000
Net gain on sales of mortgage loans	(15,519,000)	(5,112,000)	(3,791,000)
Change in fair value of mortgage servicing rights	3,999,000	2,662,000	734,000
Net discount / premium from (accretion) amortization on loans	(911,000)	(1,025,000)	(1,703,000)
Change in cash surrender value of BOLI	(1,233,000)	(1,415,000)	(984,000)
Net gains on sale of other real estate owned	(204,000)	(264,000)	(792,000)
Provision for other real estate owned valuation losses	357,000	519,000	581,000
Depreciation of fixed assets and amortization of leasehold improvements	2,798,000	2,462,000	2,423,000
Amortization of core deposit intangible	494,000	539,000	387,000
Change in current income taxes receivable	811,000	1,546,000	1,678,000
Provision for deferred tax expense	(646,000)	6,436,000	9,840,000
Change in accrued interest receivable and other assets	(17,692,000)	(6,350,000)	1,218,000
Accretion of purchase accounting adjustment on time deposits		(38,000)	(100,000)
Amortization of purchase accounting adjustment on notes payable and other borrowings	27,000	92,000	81,000
Amortization of junior subordinated debentures issuance costs	643,000	48,000	47,000
Amortization of senior notes issuance costs	105,000	112,000	100,000
Change in accrued interest payable and other liabilities	6,118,000	6,863,000	1,390,000
Stock based compensation	2,089,000	2,516,000	2,257,000
Net cash provided by (used in) operating activities	25,987,000	52,637,000	54,907,000
Cash flows from investing activities
Proceeds from maturities and calls including pay down of securities available-for-sale	48,054,000	41,752,000	40,641,000
Proceeds from sales of securities available-for-sale	18,006,000	191,298,000	94,663,000
Purchases of securities available-for-sale	(65,229,000)	(159,544,000)	(75,044,000)
Proceeds from sales of FHLBC/FRBC stock		6,875,000	6,754,000
Purchases of FHLBC/FRBC stock		(3,359,000)	(8,470,000)
Net change in loans	(103,887,000)	(34,440,000)	(52,706,000)
Purchases of BOLI policies	(590,000)
Proceeds from claims on BOLI	484,000	1,196,000	1,204,000
Proceeds from sales of other real estate owned, net of participation purchase	3,275,000	2,779,000	4,723,000
Net purchases of premises and equipment	(3,921,000)	(4,345,000)	(1,895,000)
Cash paid for acquisition, net of cash and cash equivalents retained			(35,711,000)
Net cash used in investing activities	(103,808,000)	42,212,000	(25,841,000)
Cash flows from financing activities
Net change in deposits	410,324,000	10,114,000	(54,650,000)
Net change in securities sold under repurchase agreements	18,287,000	2,061,000	11,091,000
Net change in other short-term borrowings	(48,500,000)	(101,000,000)	23,625,000
Redemption of junior subordinated debentures	(32,604,000)
Issuance of term note	20,000,000
Repayment of term note	(3,000,000)
Net change in notes payable and other borrowings	(307,000)	(8,798,000)	(8,069,000)
Proceeds from exercise of stock option		32,000	33,000
Dividend paid on common stock	(1,186,000)	(1,195,000)	(1,189,000)
Purchase of treasury stock	(5,922,000)	(666,000)	(505,000)
Net cash (used in) provided by financing activities	357,092,000	(99,452,000)	(29,664,000)
Net change in cash and cash equivalents	279,271,000	(4,603,000)	(598,000)
Cash and cash equivalents at beginning of year	50,632,000	55,235,000	55,833,000
Cash and cash equivalents at end of year	329,903,000	50,632,000	55,235,000
Supplemental cash flow information
Income taxes paid	7,922,000	4,425,000	20,000
Interest paid for deposits	7,255,000	9,686,000	7,644,000
Interest paid for borrowings	5,093,000	9,073,000	8,323,000
Non-cash transfer of loans to other real estate owned	$ 898,000	$ 863,000	$ 2,915,000

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock	Cumulative Effect, Period of Adoption, Adjustment [Member]	Total
Balance at Dec. 31, 2017	$ 34,626	$ 117,742		$ 142,959	$ 1,479	$ (96,456)		$ 200,350
Increase (Decrease) in Stockholders' Equity
Net Income				34,012				34,012
Other comprehensive income, net of tax					(5,877)			(5,877)
Dividends declared and paid				(1,189)				(1,189)
Vesting of restricted stock	91	(926)				835
Reclassification of stranded tax effects				(319)	319
Stock options exercised	3	8				22		33
Stock based compensation		2,257						2,257
Purchase of treasury stock from taxes withheld on stock awards						(505)		(505)
Balance at Dec. 31, 2018	34,720	119,081		175,463	(4,079)	(96,104)		229,081
Increase (Decrease) in Stockholders' Equity
Net Income				39,455				39,455
Other comprehensive income, net of tax					8,641			8,641
Dividends declared and paid				(1,195)				(1,195)
Vesting of restricted stock	132	(634)				502
Stock options exercised	2	7				23		32
Stock warrants exercised		(313)				313
Stock based compensation		2,516						2,516
Purchase of treasury stock from taxes withheld on stock awards						(666)		(666)
Balance at Dec. 31, 2019	34,854	120,657	$ (3,783)	213,723	4,562	(95,932)	$ (3,783)	277,864
Increase (Decrease) in Stockholders' Equity
Net Income				27,825				27,825
Other comprehensive income, net of tax					10,200			10,200
Dividends declared and paid				(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						(5,499)		(5,499)
Balance at Dec. 31, 2020	$ 34,957	$ 122,212		$ 236,579	$ 14,762	$ (101,423)		$ 307,087

Consolidated Statements of Ch_2

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 277,864	$ 229,081	$ 200,350
Other comprehensive income, net of tax	10,200	8,641	(5,877)
Balance	$ 307,087	$ 277,864	$ 229,081
Dividend declared and paid (per share)	$ 0.04	$ 0.04	$ 0.04
Accumulated Other Comprehensive Income (Loss) [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	$ 4,562	$ (4,079)	$ 1,479
Reclassification of stranded tax effects			319
Other comprehensive income, net of tax	10,200	8,641	(5,877)
Balance	14,762	4,562	(4,079)
Accumulated Unrealized Loss on Securities Available-for-Sale
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	6,827	(4,038)	2,239
Reclassification of stranded tax effects			482
Other comprehensive income, net of tax	10,586	10,865	(6,759)
Balance	17,413	6,827	(4,038)
Accumulated Unrealized Loss on Derivative Instruments
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance	(2,265)	(41)	(760)
Reclassification of stranded tax effects			(163)
Other comprehensive income, net of tax	(386)	(2,224)	882
Balance	$ (2,651)	$ (2,265)	$ (41)

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2020
Summary of Significant Accounting Policies
Basis of Presentation and Changes in Significant Accounting Policies	Note 1: Summary of Significant Accounting Policies Nature of Operations The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Station I, LLC, which holds property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2020 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 gains (losses), 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 income (loss), 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 uncollectability 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 a collective basis is allocated to individual loans. 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. Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. On January 1, 2020, the Company implemented ASU No. 2016-13, “Financial Instruments – Credit Measurement of Credit Losses on Financial Instruments (Topic 326),” also known as Current Expected Credit Losses, or CECL. As a result of CECL implementation, the Company’s purchase credit impaired loans (“PCI loans”) became PCD loans. Allowance for Credit Losses 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 ( 6.0 years) 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 ( 4.5 years) 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”) ● HELOC legacy - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ● HELOC purchased - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections; in addition, the peer data source used for loss rate analysis is the correspondent bank from which we purchased the 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 legacy HELOC segments; and (iii) a WARM (weighted average remaining life) methodology is used for lease financing receivables, HELOCs purchased, and consumer segments. For loan pools sub-segmented by risk level, which include commercial, real estate-commercial and multifamily segments, linear regression methods were utilized along with expected industry performance over the next twelve months to determine what level of qualitative adjustment would be necessary to account for expected risk rating migration. This methodology relied heavily on existing and anticipated weighted risk ratings by industry or property type. The forecast period used for each segment calculation was one year. 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, regionally 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. 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 income 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. Other Real Estate Owned (“OREO”) decrease between the recorded value and the updated fair value less costs to sell. Such declines are included in other noninterest expense in the Consolidated Statements of Income. A subsequent reversal of an OREO valuation adjustment can occur, but the resultant carrying value cannot exceed the cost basis established at transfer of the loan to OREO. Operating costs after acquisition are also expensed. Mortgage Servicing Rights Mortgage loans that the Company is servicing for others aggregated to $793.5 million and $723.4 million at December 31, 2020, and 2019, 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. Bank-Owned Life Insurance (“BOLI”) Goodwill and Core Deposit Intangible Due to the significant deteriorations of economic conditions stemming from the COVID-19 pandemic in the first quarter of 2020, the Company assessed impairment indicators and determined it was more likely than not the Company’s fair value exceeded its carrying value. Due to the decline in the trading price of our common stock and an elevated U.S. unemployment rate, we performed interim impairment evaluations at March 31, June 30 and September 30, 2020. At each quarter-end, we analyzed the current and expected impact of the pandemic on our business, operations, and financial condition and determined it was more likely than not the Company’s fair value exceeded its carrying value, as the negative market indicators were not observed over a sustained period of time. We performed our annual impairment test at November 30, 2020, and elected to first conduct a qualitative analysis to determine if a quantitative analysis was necessary. We analyzed the changes in the negative market indicators discussed above from September 30, 2020, the date of the most recent interim impairment test, to November 30, 2020. The result of this comparison showed an improvement in the U.S. unemployment rate from 7.9% to 6.7%, and an increase in the trading price of our common stock of 28.8%. We also analyzed the impact of the pandemic on our business, operations, and financial condition prior to November 30, 2020 as well as the expected impact in the future, in light of the improving trends discussed above. As a result of the November 30, 2020, qualitative analysis, we determined goodwill was not impaired as it was more likely than not the Company’s fair value exceeded its carrying value. Accordingly, a quantitative analysis was not performed. The Company’s November 30, 2019, qualitative goodwill assessment resulted in the Company determining goodwill was not impaired, as it was more likely than not the Company’s fair value exceeded its carrying value. The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2020, $2.2 million of CDI remained, stemming from the Company’s purchase of ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $494,000, $539,000 and $387,000 was recorded in 2020, 2019, and 2018, respectively. The expected future annual amortization expense for each of the next five years (2021-2025) is approximately $459,000 , $421,000 , $379,000 , $331,000 , and $274,000 . Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheet 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 – Wealth Management 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, 2020 and 2019, 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, 2020 and 2019. The Company is currently open to audit under the statute of limitations by the Internal Revenue Service from 2017 to 2019, the state of Illinois from 2017 to 2019, the states of Wisconsin and Indiana from 2010 to 2019, the state of Texas from 2016 to 2019, and Florida for 2019. 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 2016-13 Measurement of Credit Losses on Financial Instruments (Topic 326)” Based on our portfolio composition at December 31, 2019, and the economic environment at that time, we recorded an overall increase in our ACL for loans and leases of $5.9 million and an ACL for unfunded commitments of $1.7 million as of January 1, 2020, the date we adopted CECL. Approximately $2.5 million of the increase to the ACL on loans resulted from the transfer of the non-accretable purchase accounting adjustments on purchased credit impaired loans. There was no impact from adoption of CECL on securities available-for sale. As a result of the adoption of this new standard on January 1, 2020, we recorded a reduction to retained earnings of approximately $3.8 million, which was net of the $1.4 million deferred tax asset impact stemming from adoption. ASU 2018-16, ASU 2020-04 and ASU 2021-01 - 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 has formed a LIBOR transition team, and has developed a project plan 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 International Swaps and Derivatives Association (“ISDA”) protocol adherence for LIBOR fallback language for all commercial swaps, has met with our commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by our Bank for new loans to ensure appropriate fallback language is included. We continue to meet regularly to address ongoing talks on the project plan, such as structuring final transition timelines to cease the issuance of any LIBOR referenced products. This project is ongoing, but the Company anticipates being ready for the proposed LIBOR cessation at the end of 2021. Subsequent Events On January 19, 2021, the Company’s Board of Directors declared a cash dividend of $0.01 per share payable on February 8, 2021, to stockholders of record as of January 29, 2021.

Cash and Due from Banks

Cash and Due from Banks	12 Months Ended
Cash and Due from Banks	Dec. 31, 2020
Cash and Due from Banks.
Cash and Due from Banks	Note 2: Cash and Due from Banks At December 31, 2019, the Bank was required to maintain average balances on hand or with the FRBC of $12.4 million. As of March 26, 2020, the FRBC eliminated reserve requirements for certain depository institutions, including the Bank. As such, there was no reserve requirement at December 31, 2020. 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
Securities	Dec. 31, 2020
Securities
Securities	Note 3: Securities The following table summarizes the amortized cost and fair value of the securities portfolio at December 31, and the corresponding amounts of gross unrealized gains and losses were as follows: Gross Gross Amortized Unrealized Unrealized Fair December 31, 2020 Cost 1 Gains Losses Value Securities available-for-sale U.S. Treasury $ 4,014 $ 103 $ - $ 4,117 U.S. government agencies 6,811 - (154) 6,657 U.S. government agencies mortgage-backed 16,098 1,112 (1) 17,209 States and political subdivisions 229,352 21,269 (1,362) 249,259 Collateralized mortgage obligations 53,999 2,866 (280) 56,585 Asset-backed securities 130,959 1,370 (511) 131,818 Collateralized loan obligations 30,728 15 (210) 30,533 Total securities available-for-sale $ 471,961 $ 26,735 $ (2,518) $ 496,178 Gross Gross Amortized Unrealized Unrealized Fair December 31, 2019 Cost 1 Gains Losses Value Securities available-for-sale U.S. Treasury $ 4,010 $ 26 $ - $ 4,036 U.S. government agencies 8,502 - (165) 8,337 U.S. government agencies mortgage-backed 16,164 443 (19) 16,588 States and political subdivisions 240,399 11,207 (2,431) 249,175 Collateralized mortgage obligations 57,059 963 (38) 57,984 Asset-backed securities 82,114 617 (887) 81,844 Collateralized loan obligations 66,898 29 (243) 66,684 Total securities available-for-sale $ 475,146 $ 13,285 $ (3,783) $ 484,648 1 Excludes interest receivable of $2.7 million and $3.2 million at December 31, 2020 and December 31, 2019, respectively, that is recorded in other assets on the consolidated balance sheet. FHLBC stock was $3.7 million at December 31, 2020 and December 31, 2019. FRBC stock was $6.2 million at December 31, 2020 and December 31, 2019. Our FHLBC stock is necessary to maintain access to FHLBC advances. Securities valued at $335.8 million as of December 31, 2020, were pledged to secure deposits and borrowings, and for other purposes, an increase from $320.8 million at year-end 2019. The fair value, amortized cost and weighted average yield of debt securities at December 31, 2020, 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 $ 423 2.09 % $ 427 Due after one year through five years 5,833 2.11 6,062 Due after five years through ten years 27,802 2.33 29,027 Due after ten years 206,119 3.02 224,517 240,177 2.92 260,033 Mortgage-backed and collateralized mortgage obligations 70,097 2.95 73,794 Asset-backed securities 130,959 1.37 131,818 Collateralized loan obligations 30,728 2.04 30,533 Total securities available-for-sale $ 471,961 2.44 % $ 496,178 At December 31, 2020, the Company’s investments include asset-backed securities totaling $105.0 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, 2020, the likelihood of the decrease in the government guarantee was minimal as the average rate of reimbursement for 2020 was less than 1.0%. The Company has accumulated the securities issued from one originator that individually amounted to over 10% of the Company’s stockholders equity. The amortized cost and fair value of securities related to this issuer are as follows: December 31, 2020 Amortized Fair Issuer Cost Value Towd Point Mortgage Trust 33,198 35,479 Securities with unrealized losses with no corresponding allowance for credit losses at December 31, 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, 2020 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. government agencies - $ - $ - 4 $ 154 $ 6,657 4 $ 154 $ 6,657 U.S. government agencies mortgage-backed 1 1 141 - - - 1 1 141 States and political subdivisions - - - 1 1,362 3,433 1 1,362 3,433 Collateralized mortgage obligations 4 279 8,142 1 1 146 5 280 8,288 Asset-backed securities 1 2 251 3 509 49,572 4 511 49,823 Collateralized loan obligations 1 31 7,468 4 179 21,477 5 210 28,945 Total securities available-for-sale 7 $ 313 $ 16,002 13 $ 2,205 $ 81,285 20 $ 2,518 $ 97,287 Less than 12 months 12 months or more December 31, 2019 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. government agencies - $ - $ - 4 $ 165 $ 8,337 4 $ 165 $ 8,337 U.S. government agencies mortgage-backed 3 10 3,018 2 9 843 5 19 3,861 States and political subdivisions 6 1,665 41,043 2 766 6,593 8 2,431 47,636 Collateralized mortgage obligations 2 26 9,054 2 12 1,209 4 38 10,263 Asset-backed securities 4 839 54,540 1 48 3,238 5 887 57,778 Collateralized loan obligations 4 62 21,927 4 181 25,020 8 243 46,947 Total securities available-for-sale 19 $ 2,602 $ 129,582 15 $ 1,181 $ 45,240 34 $ 3,783 $ 174,822 The unrealized loss attributable to our collateral loan obligations are the result of spread widening in that sector due to the current economic environment. The unrealized loss attributable to our U.S. government agencies is associated with our SBA positions. Shortly after purchase a structural change in the SBA program occurred that led to higher prepayments which negatively affected these positions. The unrealized loss attributable to states and political subdivisions, collateralized mortgage obligations, and asset-backed securities are due to limited illiquidity as a result of a few securities with uncommon structures and lesser known issuers. The asset-backed securities are primarily backed by student loans under the FFEL program, these securities are 97% guaranteed by U.S. DOE and have a long history of no credit losses. At December 31, 2020, we have no intent to sell any securities that were in an unrealized loss position nor is it expected that we would be required to sell the securities prior to their anticipated recovery . 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 2020 2019 2018 Proceeds from sales of securities $ 18,006 $ 191,298 $ 94,663 Gross realized gains on securities 17 5,521 369 Gross realized losses on securities (42) (1,010) (9) Net realized (losses) gains $ (25) $ 4,511 $ 360 Income tax (expense) benefit on net realized gains (losses) $ 7 $ (1,267) $ (100) Effective tax rate applied 28.0 % 28.1 % 27.8 %

Loans and Allowance for Credit

Loans and Allowance for Credit Losses on Loans	12 Months Ended
Loans and Allowance for Credit Losses on Loans	Dec. 31, 2020
Loans and Allowance for Credit Losses on Loans
Loans and Allowance for Credit Losses on Loans	Note 4: Loans and Allowance for Credit Losses on Loans The composition of loans by portfolio segment as of December 31, were as follows: 2020 2019 Commercial 1 $ 407,159 $ 332,842 Leases 141,601 119,751 Commercial real estate - Investor 582,042 520,095 Commercial real estate - Owner occupied 333,070 345,504 Construction 98,486 69,617 Residential real estate - Investor 56,137 71,105 Residential real estate - Owner occupied 116,388 136,023 Multifamily 189,040 189,773 HELOC 80,908 91,605 HELOC - Purchased 19,487 31,852 Other 2 10,533 12,258 Total loans, excluding deferred loan costs and PCI loans 3 2,034,851 1,920,425 Net deferred loan costs - 1,786 Total loans, excluding PCI loans 3 2,034,851 1,922,211 PCI loans - 8,601 Total loans, including deferred loan costs and PCI loans 3 $ 2,034,851 $ 1,930,812 Allowance for credit losses on loans (33,855) (19,789) Net loans 4 $ 2,000,996 $ 1,911,023 1 Includes $74.1 million of PPP loans at December 31, 2020 2 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 4 - Loans and Allowance for Credit Losses on Loans. 3 After the Company’s adoption of CECL, all PCD loans are included within each relevant portfolio segment and are not separately reported as PCI loans. 4 Excludes accrued interest receivable of $7.0 million and $6.5 million at December 31, 2020 and December 31, 2019, respectively, that is recorded in other assets on the consolidated balance sheet. 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 72.5% and 75.4% of the portfolio at December 31, 2020 and December 31, 2019, respectively, and include a mix of owner and non-owner occupied, residential, construction and multifamily loans. The following table represent the activity in the ACL for loans for the year ended December 31, 2020: Impact of Provision Beginning Adopting for Credit Ending Balance ASC 326 Losses Charge-offs Recoveries Balance 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) 4,075 512 165 9,205 Commercial real estate - Owner occupied 3,678 (848) 487 1,763 697 2,251 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 (1,198) 127 387 1,749 HELOC - Purchased - - 265 66 - 199 Other 640 607 445 244 170 1,618 Ending Balance, December 31, 2020 $ 19,789 $ 5,879 $ 9,166 $ 3,068 $ 2,089 $ 33,855 The following table presents activity in the allowance for loan and lease losses for the years ended December 31, 2019 and December 31, 2018, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: Provision Beginning for Loan Ending Allowance for loan and lease losses: Balance Losses Charge-offs Recoveries Balance Commercial $ 2,832 $ 218 $ 109 $ 74 $ 3,015 Leases 734 577 49 - 1,262 Commercial real estate - Investor 6,339 (497) 303 679 6,218 Commercial real estate - Owner occupied 3,515 874 716 5 3,678 Construction 969 (448) 9 1 513 Residential real estate - Investor 554 43 7 11 601 Residential real estate - Owner occupied 1,377 (86) 111 77 1,257 Multifamily 616 813 - 15 1,444 HELOC 1,449 (351) 109 172 1,161 HELOC - Purchased - 229 229 - - Other 621 228 409 200 640 Ending Balance, December 31, 2019 $ 19,006 $ 1,600 $ 2,051 $ 1,234 $ 19,789 Provision Beginning for Loan Ending Allowance for loan and lease losses: Balance Losses Charge-offs Recoveries Balance Commercial $ 2,453 $ 263 $ 41 $ 157 $ 2,832 Leases 692 55 13 - 734 Commercial real estate - Investor 5,020 2,255 1,376 440 6,339 Commercial real estate - Owner occupied 3,157 523 172 7 3,515 Construction 923 (5) (16) 35 969 Residential real estate - Investor 542 (110) (13) 109 554 Residential real estate - Owner occupied 1,304 (784) (10) 847 1,377 Multifamily 1,345 (941) (22) 190 616 HELOC 1,446 (214) 147 364 1,449 HELOC - Purchased - - - - - Other 579 186 409 265 621 Ending Balance, December 31, 2018 $ 17,461 $ 1,228 $ 2,097 $ 2,414 $ 19,006 The following table presents the collateral dependent loans and the related ACL allocated by segment of loans as of December 31, 2020: Accounts ACL December 31, 2020 Real Estate Receivable Equipment Other Total Allocation Commercial $ - $ 1,070 $ - $ 55 $ 1,125 $ 56 Leases - - 2,377 597 2,974 880 Commercial real estate - Investor 4,179 - - - 4,179 84 Commercial real estate - Owner occupied 9,726 - - - 9,726 195 Construction 1,891 - - - 1,891 952 Residential real estate - Investor 928 - - - 928 - Residential real estate - Owner occupied 3,535 - - - 3,535 10 Multifamily 3,838 - - - 3,838 378 HELOC 1,053 - - - 1,053 78 HELOC - Purchased - - - - - - Other - - - 4 4 4 Total $ 25,150 $ 1,070 $ 2,377 $ 656 $ 29,253 $ 2,637 Aged analysis of past due loans by class of loans as of December 31, 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, 2020 1 Past Due Past Due Due Due Current Total Loans Accruing Commercial $ - $ - $ 52 $ 52 $ 407,107 $ 407,159 $ - Leases 613 59 316 988 140,613 141,601 163 Commercial real estate - Investor 1,439 - 1,108 2,547 579,495 582,042 - Commercial real estate - Owner occupied 1,848 958 7,309 10,115 322,955 333,070 - Construction 1,237 - - 1,237 97,249 98,486 - Residential real estate - Investor 1,022 20 484 1,526 54,611 56,137 157 Residential real estate - Owner occupied 859 286 717 1,862 114,526 116,388 114 Multifamily 3,282 467 - 3,749 185,291 189,040 - HELOC 549 50 206 805 80,103 80,908 - HELOC - Purchased 47 - - 47 19,440 19,487 - Other 20 - - 20 10,513 10,533 - Total $ 10,916 $ 1,840 $ 10,192 $ 22,948 $ 2,011,903 $ 2,034,851 $ 434 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. There were 499 loans which totaled $231.3 million modified under the CARES Act. As of December 31, 2020, 51 loans of the original 499 loans deferred, or $32.7 million, had an active deferral request and were in compliance with modified terms; 448 loans which totaled $198.6 million had resumed payments or paid off. Details of loans in active deferral is below: December 31, 2020 1st Deferral 2nd Deferral 3rd Deferral Total Loans modified under CARES Act, in deferral $ 9,431 $ 19,906 $ 3,408 $ 32,745 Loans modified under CARES Act, in nonaccrual, within deferral above 999 1,230 2,121 4,350 The following table presents the age analysis of past due loans as of December 31, 2019, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: Recorded Investment 90 days or 90 Days or Greater Past 30-59 Days 60-89 Days Greater Past Total Past Due and December 31, 2019 Past Due Past Due Due Due Current Nonaccrual Total Loans Accruing Commercial $ 1,271 $ 925 $ 2,103 $ 4,299 $ 328,399 $ 144 $ 332,842 $ 2,132 Leases 362 - 81 443 118,979 329 119,751 128 Commercial real estate - Investor 626 95 343 1,064 517,336 1,695 520,095 348 Commercial real estate - Owner occupied 2,469 1,026 - 3,495 336,829 5,180 345,504 - Construction 26 - - 26 69,498 93 69,617 - Residential real estate - Investor 141 125 - 266 70,051 788 71,105 - Residential real estate - Owner occupied 3,450 1,351 - 4,801 128,650 2,572 136,023 - Multifamily 10 1,700 - 1,710 187,995 68 189,773 - HELOC 735 50 18 803 89,438 1,364 91,605 20 HELOC - Purchased - - - - 31,672 180 31,852 - Other 1 28 - - 28 13,997 19 14,044 - Total, excluding PCI 9,118 5,272 2,545 16,935 1,892,844 12,432 1,922,211 2,628 PCI loans, net of purchase accounting adjustments 261 - - 261 5,377 2,963 8,601 - Total $ 9,379 $ 5,272 $ 2,545 $ 17,196 $ 1,898,221 $ 15,395 $ 1,930,812 $ 2,628 1 The “Other” class includes consumer loans, overdrafts and net deferred costs. The following table presents all nonaccrual loans and loans on nonaccrual for which there was no related allowance for credit losses as of: December 31, 2020 December 31, 2019 Nonaccrual Nonaccrual Nonaccrual With no ACL Nonaccrual With no ACL Commercial $ 1,125 $ 1,070 $ 144 $ - Leases 2,638 309 329 70 Commercial real estate - Investor 1,632 1,632 1,695 1,590 Commercial real estate - Owner occupied 9,262 6,780 5,180 2,366 Construction - - 93 93 Residential real estate - Investor 928 928 788 788 Residential real estate - Owner occupied 3,206 3,206 2,572 2,475 Multifamily 2,437 2,437 68 68 HELOC 1,052 845 1,364 1,154 HELOC - Purchased - - 180 180 Other 1 - - 19 2 Total, excluding PCI loans 22,280 17,207 12,432 8,786 PCI loans, net of purchase accounting adjustments - - 2,963 2,963 Total $ 22,280 $ 17,207 $ 15,395 $ 11,749 The Company recognized $70,000 of interest on nonaccrual loans during the year ended December 31, 2020. 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, were as follows: Revolving Loans Converted Revolving To Term 2020 2019 2018 2017 2016 Prior Loans Loans Total Commercial Pass $ 101,796 $ 42,294 $ 14,519 $ 6,265 $ 1,825 $ 1,691 $ 230,388 $ - $ 398,778 Special Mention 5,130 425 68 - 3 - 76 - 5,702 Substandard 273 52 1,524 - - - 830 - 2,679 Total commercial 107,199 42,771 16,111 6,265 1,828 1,691 231,294 - 407,159 Leases Pass 56,605 52,168 16,830 6,545 5,242 651 - - 138,041 Special Mention 175 163 - - - - - - 338 Substandard - 1,434 798 59 450 481 - - 3,222 Total leases 56,780 53,765 17,628 6,604 5,692 1,132 - - 141,601 Commercial real estate - Investor Pass 173,781 158,677 92,156 66,762 55,963 15,966 1,319 - 564,624 Special Mention 2,394 9,592 220 - 95 - - - 12,301 Substandard 2,709 1,126 71 - 340 871 - - 5,117 Total commercial real estate - investor 178,884 169,395 92,447 66,762 56,398 16,837 1,319 - 582,042 Commercial real estate - Owner occupied Pass 72,605 52,809 73,719 45,315 50,000 25,507 1,324 - 321,279 Special Mention 604 - - - - - - - 604 Substandard 1,564 2,154 1,780 1,664 501 3,524 - - 11,187 Total commercial real estate - owner occupied 74,773 54,963 75,499 46,979 50,501 29,031 1,324 - 333,070 Construction Pass 50,170 24,163 7,203 539 218 1,261 9,702 - 93,256 Special Mention 38 - - - - - - - 38 Substandard - 3,135 2,057 - - - - - 5,192 Total construction 50,208 27,298 9,260 539 218 1,261 9,702 - 98,486 Residential real estate - Investor Pass 9,371 14,194 8,522 7,775 2,431 11,184 1,144 - 54,621 Special Mention - - - - - - - - - Substandard 349 - 610 - 91 466 - - 1,516 Total residential real estate - investor 9,720 14,194 9,132 7,775 2,522 11,650 1,144 - 56,137 Residential real estate - Owner occupied Pass 18,308 23,450 10,808 15,409 10,394 31,325 2,654 - 112,348 Special Mention - - - - - - - - - Substandard 47 - 412 219 526 2,836 - - 4,040 Total residential real estate - owner occupied 18,355 23,450 11,220 15,628 10,920 34,161 2,654 - 116,388 Multifamily Pass 40,671 30,849 44,301 38,133 12,147 7,735 197 - 174,033 Special Mention - 6,901 - 548 - - - - 7,449 Substandard 69 - 4,254 927 118 2,190 - - 7,558 Total multifamily 40,740 37,750 48,555 39,608 12,265 9,925 197 - 189,040 HELOC Pass 2,511 2,174 1,679 2,120 504 803 69,483 - 79,274 Special Mention - - - - - - 94 - 94 Substandard - - 86 37 271 91 1,055 - 1,540 Total HELOC 2,511 2,174 1,765 2,157 775 894 70,632 - 80,908 HELOC - Purchased Pass - - - - - 19,487 - - 19,487 Special Mention - - - - - - - - - Substandard - - - - - - - - - Total HELOC - purchased - - - - - 19,487 - - 19,487 Other Pass 1,555 574 569 229 559 341 6,702 - 10,529 Special Mention - - - - - - - - - Substandard - - 4 - - - - - 4 Total other 1,555 574 573 229 559 341 6,702 - 10,533 Total loans Pass 527,373 401,352 270,306 189,092 139,283 115,951 322,913 - 1,966,270 Special Mention 8,341 17,081 288 548 98 - 170 - 26,526 Substandard 5,011 7,901 11,596 2,906 2,297 10,459 1,885 - 42,055 Total loans $ 540,725 $ 426,334 $ 282,190 $ 192,546 $ 141,678 $ 126,410 $ 324,968 $ - $ 2,034,851 Credit quality indicators by loan segment at December 31, 2019 were as follows: December 31, 2019 Special Pass Mention Substandard Doubtful Total Commercial $ 307,948 $ 13,206 $ 11,688 $ - $ 332,842 Leases 119,045 377 329 - 119,751 Commercial real estate - Investor 510,640 4,529 4,926 520,095 Commercial real estate - Owner occupied 330,891 6,657 7,956 - 345,504 Construction 69,355 - 262 - 69,617 Residential real estate - Investor 69,715 - 1,390 - 71,105 Residential real estate - Owner occupied 132,258 134 3,631 - 136,023 Multifamily 187,560 1,710 503 - 189,773 HELOC 89,804 12 1,789 - 91,605 HELOC - Purchased 31,672 - 180 - 31,852 Other 1 13,685 - 359 - 14,044 Total, excluding PCI loans $ 1,862,573 $ 26,625 $ 33,013 $ - $ 1,922,211 PCI loans, net of purchase accounting adjustments 573 261 7,767 - 8,601 Total $ 1,863,146 $ 26,886 $ 40,780 $ - $ 1,930,812 1 The “Other” class includes consumer, overdrafts and net deferred costs. The Company had $546,000 and $831,000 in consumer mortgage loans in the process of foreclosure as of December 31, 2020 and December 31, 2019, 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 amount of expected loan losses for TDRs is measured based upon the present value of expected future cash flows discounted at the loan’s effective interest rate, the fair value of the underlying collateral less applicable selling costs, or the observable market price of the loan. The CARES Act, as extended by certain provisions of the Consolidated Appropriations Act, 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. The number of loans that were modified during the period, including the amortized cost basis pre- and post-modification are summarized as follows: TDR Modifications Year Ended December 31, 2020 # of Pre-modification Post-modification contracts balance balance Troubled debt restructurings Residential real estate - Owner occupied HAMP 1 3 $ 410 $ 395 Total 3 $ 410 $ 395 TDR Modifications Year Ended December 31, 2019 # of Pre-modification Post-modification contracts balance balance Troubled debt restructurings Commercial real estate - Investor Other 2 2 $ 1,217 $ 1,200 Commercial real estate - Owner Occupied Deferral 3 1 421 418 Residential real estate - Owner occupied HAMP 1 3 399 293 HELOC Other 2 1 39 38 Total 7 $ 2,076 $ 1,949 1 HAMP: Home Affordable Modification Program 2 Other: Change of terms from bankruptcy court 3 Deferral: Refers to the deferral of principal 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 2020 and $39,000 of HELOC TDRs that defaulted during year 2019. As of December 31, 2020 and 2019, there were no commitments to lend additional funds to debtors whose terms have been modified in a TDR. There were no loans purchased and/or sold during year 2020. Loans to principal officers, directors, and their affiliates, which are made in the ordinary course of business, as of December 31, were as follows: 2020 2019 Beginning balance $ 961 $ 1,417 New loans 644 634 Repayments and other reductions (822) (1,025) Change in related party status - (65) Ending balance $ 783 $ 961

Other Real Estate Owned

Other Real Estate Owned	12 Months Ended
Other Real Estate Owned	Dec. 31, 2020
Other Real Estate Owned
Other Real Estate Owned	Note 5: 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 2020 2019 2018 Balance at beginning of period $ 5,004 $ 7,175 $ 8,371 Property additions, net of acquisition adjustments 898 872 3,316 Property improvements - - 59 Less: Proceeds from property disposals, net of participation purchase and of gains/losses 3,071 2,515 3,990 Period valuation adjustments 357 519 581 Other adjustments - 9 - Balance at end of period $ 2,474 $ 5,004 $ 7,175 Activity in the valuation allowance was as follows: Twelve Months Ended December 31, 2020 2019 2018 Balance at beginning of period $ 6,712 $ 8,027 $ 8,208 Provision for unrealized losses 357 519 581 Reductions taken on sales (5,426) (1,834) (762) Balance at end of period $ 1,643 $ 6,712 $ 8,027 Expenses related to OREO, net of lease revenue includes: Twelve Months Ended December 31, 2020 2019 2018 Gain on sales, net $ (204) $ (264) $ (792) Provision for unrealized losses 357 519 581 Operating expenses 535 173 649 Less: Lease revenue 37 5 42 Net OREO expense $ 651 $ 423 $ 396

Premises and Equipment

Premises and Equipment	12 Months Ended
Premises and Equipment	Dec. 31, 2020
Premises and Equipment
Premises and Equipment	Note 6: Premises and Equipment Premises and equipment at December 31, were as follows: 2020 2019 Accumulated Accumulated Depreciation/ Net Book Depreciation/ Net Book Cost Amortization Value Cost Amortization Value Land $ 18,501 $ - $ 18,501 $ 18,501 $ - $ 18,501 Buildings 43,579 25,909 17,670 43,457 24,912 18,545 Leasehold improvements 2,324 699 1,625 2,314 399 1,915 Furniture and equipment 51,461 43,780 7,681 47,696 42,303 5,393 Total Premises and Equipment $ 115,865 $ 70,388 $ 45,477 $ 111,968 $ 67,614 $ 44,354

Deposits

Deposits	12 Months Ended
Deposits	Dec. 31, 2020
Deposits
Deposits	Note 7: Deposits Major classifications of deposits at December 31, were as follows: 2020 2019 Noninterest bearing demand $ 909,505 $ 669,795 Savings 399,057 307,015 NOW accounts 486,612 425,792 Money market accounts 316,465 282,478 Certificates of deposit of less than $100,000 200,107 227,578 Certificates of deposit of $100,000 through $250,000 164,982 151,279 Certificates of deposit of more than $250,000 60,345 62,812 Total deposits $ 2,537,073 $ 2,126,749 The Company had $59.1 million and $31.4 million in listing service deposits as of December 31, 2020 and 2019. Deposits held by senior officers and directors, including their related interests, totaled $2.3 million and $2.9 million as of December 31, 2020 and 2019. At December 31, 2020, scheduled maturities of time deposits were as follows: 2021 $ 349,003 2022 30,295 2023 18,308 2024 7,774 2025 20,054 Total time deposits $ 425,434

Borrowings

Borrowings	12 Months Ended
Borrowings	Dec. 31, 2020
Borrowings
Borrowings	Note 8: Borrowings The following table is a summary of borrowings as of December 31, 2020: 2020 2019 Securities sold under repurchase agreements $ 66,980 $ 48,693 Other short-term borrowings 1 - 48,500 Junior subordinated debentures 2 25,773 57,734 Senior notes 44,375 44,270 Notes payable and other borrowings 23,393 6,673 Total borrowings $ 160,521 $ 205,870 1 Includes short-term FHLBC advances and the outstanding portion of an operating line of credit. 2 See Note 9: 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 $67.0 million and $48.7 million at December 31, 2020 and 2019, respectively. The fair value of the pledged collateral was $94.4 million and $70.7 million at December 31, 2020 and December 31, 2019, respectively. At December 31, 2020, there were no customers with secured balances exceeding 10% of stockholders’ equity. Total FHLBC advances are generally limited to the lower of 35% of total assets and the amount of acceptable collateral adjusted for applicable funding percentages as determined by the FHLBC. As of December 31, 2020, the Bank had no outstanding short-term FHLBC advances. As of December 31, 2019, the Bank had outstanding short-term FHLBC advances in the amount of $48.5 million with a weighted average interest rate of 1.78% . As of December 31, 2020, FHLBC stock owned by the Bank was valued at $3.7 million, the fair value of securities pledged to the FHLBC was $54.7 million, and the principal balance of loans pledged was $625.8 million. In 2018, the Bank assumed $23.4 million of long-term FHLBC advances with the ABC acquisition. At December 31, 2020, one remaining long-term FHLBC advance, which is included in notes payable and other borrowings, has a total outstanding balance of $6.4 million and is scheduled to mature over the next 5.25 years with an interest rate of 2.83% . At December 31, 2019, these long-term FHLBC advances had a total outstanding balance of $6.7 million and were scheduled to mature over the next 6.25 years with interest rate of 2.83% . Based on the total amount of securities and loans pledged, the Bank had total borrowing capacity of $459.5 million. Adjusting for the outstanding advances and letters of credit, the Bank had a remaining funding availability of $336.9 million on December 31, 2020. The Company also has $44.4 million of senior notes outstanding, net of deferred issuance costs, as of December 31, 2020 and $44.3 million as of December 31, 2019. The senior notes were issued in 2016, had an original maturity of ten years , and terms include interest payable semiannually at 5.75% for five years . Beginning December 31, 2021, the senior debt will pay interest at a floating rate, with interest payable quarterly at three month LIBOR plus 385 basis points. 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, 2020 and 2019, unamortized debt issuance costs related to the senior notes were $625,000 and $730,000 , 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 $17.0 million is outstanding as of December 31, 2020, 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 9 – Junior Subordinated Debentures Scheduled maturities and weighted average rates of borrowings for the years ended December 31, were as follows: 2020 2019 Weighted Weighted Average Average Balance Rate Balance Rate 2020 $ - - $ 97,193 1.85 % 2021 70,980 0.46 % - - 2022 4,000 1.91 - - 2023 9,000 1.91 - - 2024 - - - - 2025 - - - - Thereafter 76,541 5.24 108,677 6.11 Total borrowings $ 160,521 2.86 % $ 205,870 4.10 %

Junior Subordinated Debentures

Junior Subordinated Debentures	12 Months Ended
Junior Subordinated Debentures	Dec. 31, 2020
Junior Subordinated Debentures.
Junior Subordinated Debentures	Note 9: Junior Subordinated Debentures On March 2, 2020, the Company redeemed 7.80% cumulative trust preferred securities issued by Old Second Capital Trust I (“OSBCP”) and related debentures, which totaled $32.6 million. These debentures were originally issued in 2003 for a term of 30 years at 7.80% , and subject to regulatory approval, were able to be called in whole or in part by the Company after June 30, 2008. The Company received regulatory approval to redeem the debentures in early 2020, and notified OSBCP stockholders of the redemption in late January 2020. Cash disbursed for the redemption, including accrued interest on the debentures, totaled $33.0 million, or $10.13 per OSBCP share. The OSBCP redemption was funded by cash on hand and the $20 million term note discussed in Note 8 – Borrowings . Upon redemption of the junior subordinated debentures related to OSBCP in March 2020, the Company recognized the remaining unamortized debt issuance costs of $635,000 . The Company sold $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 also 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 float at 150 basis points over three-month LIBOR thereafter. Upon conversion to a floating rate on June 16, 2017, a cash flow hedge was initiated, whereby the Company swapped the three-month LIBOR for a fixed rate of 2.8% . Accordingly, the effective rate of the instrument was 4.4% as of December 31, 2020 and 2019. 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 Trust I and Trust II the debentures issued by the Company are disclosed on the Consolidated Balance Sheets as junior subordinated debentures and the related interest expense for each issuance is included in the Consolidated Statements of Income. As of December 31, 2020 and 2019, unamortized debt issuance costs related to the junior subordinated debentures were $1,000 and $644,000 respectively, and are included as a reduction to the balance of the junior subordinated debentures on the Consolidated Balance Sheets. Under the terms of the subordinated debenture issued to Old Second Capital Trust II, the Company is allowed to defer payments of interest for 20 quarterly periods without default or penalty, but such amounts continue to accrue. Also during a deferral period, the Company generally may not pay cash dividends on or repurchase its common stock or preferred stock. As of December 31, 2020, the Company is current on the payments due on these securities.

Income Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2020
Income Taxes
Income Taxes	Note 10: Income Taxes Income tax expense (benefit) for the years ending December 31, were as follows: 2020 2019 2018 Current federal $ 6,269 $ 4,815 $ - Current state 3,960 1,151 84 Deferred federal (135) 3,177 6,226 Deferred state (511) 3,259 3,614 Total income tax expenses $ 9,583 $ 12,402 $ 9,924 The following were the components of the deferred tax assets and liabilities as of December 31: 2020 2019 Allowance for credit losses $ 11,058 $ 6,082 Deferred compensation 1,093 907 Goodwill amortization/impairment 2,212 3,456 Stock based compensation 1,356 1,622 Business combination adjustments 255 1,547 OREO write-downs 614 1,931 Federal recognized built-in loss ("RBIL") carryforward 142 340 State net operating loss and RBIL carryforward 60 326 Other assets 2,182 2,270 Total deferred tax assets 18,972 18,481 Accumulated depreciation on premises and equipment (1,237) (746) Mortgage servicing rights (1,261) (1,779) Amortization of core deposit intangible (171) (144) State tax benefits (930) (927) Other liabilities (1,481) (1,637) Total deferred tax liabilities (5,080) (5,233) Net deferred tax asset before adjustments related to other comprehensive income 13,892 13,248 Tax effect of adjustments related to other comprehensive income (5,771) (1,789) Net deferred tax asset $ 8,121 $ 11,459 At December 31, 2020, the Company no longer has federal nor state net operating loss carryforward. The Company had $674,000 of recognized built-in loss carryforward, which is below the $945,300 limitation per year under IRC Section 382. The components of the provision for deferred income tax expense (benefit) for the years ending December 31, were as follows: 2020 2019 2018 Provision for credit losses $ (4,976) $ (279) $ (426) Deferred compensation (186) (242) (15) Amortization of core deposit intangible 27 14 957 Stock based compensation 266 (245) (511) Business combination adjustments 1,292 985 927 OREO write-downs 1,317 406 48 Federal net operating loss and RBIL carryforward 198 1,859 5,041 State net operating loss and RBIL carryforward 266 3,708 2,986 Depreciation 491 303 59 Mortgage servicing rights (518) (431) 124 Goodwill amortization/impairment 1,244 1,242 1,389 State tax benefits 3 (912) (550) Other, net (70) 28 (189) Total deferred tax (benefit) expense $ (646) $ 6,436 $ 9,840 Effective tax rates differ from federal statutory rates applied to financial statement income for the years ended December 31, due to the following: 2020 2019 2018 Tax at statutory federal income tax rate $ 7,856 $ 10,890 $ 9,227 Nontaxable interest income, net of disallowed interest deduction (1,067) (1,409) (1,600) BOLI income (271) (480) (422) State income taxes, net of federal benefit 2,570 3,496 2,927 Stock based compensation 297 (207) (305) Other, net 198 112 97 Total tax at effective tax rate $ 9,583 $ 12,402 $ 9,924 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, significantly improved asset quality and an improved capital position. No significant negative evidence was noted.

Equity Compensation Plans

Equity Compensation Plans	12 Months Ended
Equity Compensation Plans	Dec. 31, 2020
Equity Compensation Plans
Equity Compensation Plans	Note 11: Equity Compensation Plans Stock-based awards are outstanding under the Company’s 2014 Equity Incentive Plan, as amended (the “2014 Plan”), and the Company’s 2019 Equity Incentive Plan (the “2019 Plan”, together with the 2014 Plan, the “Plans”). The 2019 Plan was approved at the May 2019 annual stockholders’ meeting and the number of authorized shares under the 2019 Plan is fixed at 600,000. Following the approval of the 2019 Plan, no further awards will be granted under the 2014 Plan or 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, 2020, 354,268 shares remained available for issuance under the 2019 Plan. The Company granted 16,500 stock options in 2009 under the 2008 Equity Incentive Plan, and there are no remaining outstanding stock options as of December 31, 2020. No stock options were granted in 2009 through 2020. There were 4,500 stock options exercised during each of 2019 and 2018, and no stock options exercised during 2020 At December 31, 2020, the Company had no unrecognized compensation cost related to unvested stock options as all stock options have fully vested. A summary of stock option activity as of each year is as follows: 2020 2019 2018 Intrinsic value of options exercised $ - $ 27 $ 27 Cash received from option exercises - 32 33 Tax benefit realized from option exercises - 5 5 Weighted average fair value of options granted - - - Generally, restricted stock and restricted stock units granted under the Plans 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 if, 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 Plans 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 Plans 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 Plans was $2.1 million, $2.5 million and $2.3 million the years ending December 31, 2020, 2019 and 2018 respectively. There were 140,944 and 171,356 restricted stock units granted during the years ending December 31, 2020 and 2019, 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, 2020, is as follows: December 31, 2020 Weighted Restricted Average Stock Shares Grant Date and Units Fair Value Unvested at January 1 555,283 $ 12.85 Granted 140,944 12.18 Vested (149,952) 11.16 Forfeited (13,666) 12.97 Unvested at December 31 532,609 $ 13.15 Total unrecognized compensation cost of restricted stock unit awards was $2.1 million as of December 31, 2020, which is expected to be recognized over a weighted-average period of 1.75 years.

Earnings Per Share

Earnings Per Share	12 Months Ended
Earnings Per Share	Dec. 31, 2020
Earnings Per Share
Earnings Per Share	Note 12: 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): 2020 2019 2018 Basic earnings per share: Weighted-average common shares outstanding 29,623,333 29,891,046 29,728,308 Net income $ 27,825 $ 39,455 $ 34,012 Basic earnings per share $ 0.94 $ 1.32 $ 1.14 Diluted earnings per share: Weighted-average common shares outstanding 29,623,333 29,891,046 29,728,308 Dilutive effect of unvested restricted awards 1 550,739 525,302 532,692 Dilutive effect of stock options and warrants - - 47,935 Diluted average common shares outstanding 30,174,072 30,416,348 30,308,935 Net Income $ 27,825 $ 39,455 $ 34,012 Diluted earnings per share $ 0.92 $ 1.30 $ 1.12 1 Includes the common stock equivalents for restricted share rights that are dilutive. The above earnings per share calculation did not include a warrant for 815,339 shares of common stock that was outstanding as of December 31, 2018, because the warrant was anti-dilutive at an exercise price of $13.43. Of note, the warrant was sold at auction by the Treasury in June 2013 to a third party investor. This warrant was issued in January 2009 at an exercise price of $13.43 per share, and expired on January 16, 2019.. On January 16, 2019, the warrant for 815,339 shares of the Company’s common stock was exercised in a cashless transaction. As of the date of exercise, the Company’s closing market price was $14.23 per share, resulting in 45,836 shares being issued. These shares were issued from treasury stock held by the Company, and resulted in a $313,000 reduction of treasury stock in January 2019.

Commitments

Commitments	12 Months Ended
Commitments	Dec. 31, 2020
Commitments
Commitments	Note 13: 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, 2020 December 31, 2019 Fixed Variable Total Fixed Variable Total Letters of credit: Borrower: Financial standby $ 329 $ 9,051 $ 9,380 $ 339 $ 9,612 $ 9,951 Commercial standby - - - - - - Performance standby 356 4,517 4,873 571 6,212 6,783 685 13,568 14,253 910 15,824 16,734 Non-borrower: Performance standby - 67 67 - 67 67 Total letters of credit $ 685 $ 13,635 $ 14,320 $ 910 $ 15,891 $ 16,801 Unused loan commitments: $ 88,883 $ 316,298 $ 405,181 $ 111,348 $ 320,120 $ 431,468 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, 2020, aggregate future minimum rental income to be received under noncancelable leases totaled $48,000. Total facility net operating lease expense or revenue recorded under all operating leases was a net expense of $223,000, $248,000 and $180,000 in 2020, 2019 and 2018, respectively. Total ATM lease expense, including the costs related to servicing those ATM’s, was $1.0 million, $916,000 and $979,000 in 2020, 2019 and 2018, respectively, with growth in expense in 2018 due to the ATMs obtained with the acquisition of ABC Bank, and growth in expense in 2020 due to repairs stemming from civil unrest and resultant maintenance costs required. The following table below is the estimated aggregate minimum annual rental commitments at December 31, 2020: 2026 2021 2022 2023 2024 2025 and there after Rental commitment $ 762 $ 625 $ 612 $ 628 $ 643 $ 3,297 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
Regulatory & Capital Matters	Dec. 31, 2020
Regulatory & Capital Matters
Regulatory & Capital Matters	Note 14: 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, 2020, and December 31, 2019. 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 2020 Common equity tier 1 capital to risk weighted assets Consolidated $ 277,199 11.94 $ 162,512 7.000 % N/A N/A Old Second Bank 318,466 13.75 162,128 7.000 $ 150,548 6.50 % Total capital to risk weighted assets Consolidated 331,178 14.26 243,855 10.500 N/A N/A Old Second Bank 347,408 15.00 243,186 10.500 231,605 10.00 Tier 1 capital to risk weighted assets Consolidated 302,199 13.01 197,440 8.500 N/A N/A Old Second Bank 318,466 13.75 196,870 8.500 185,289 8.00 Tier 1 capital to average assets Consolidated 302,199 10.21 118,393 4.00 N/A N/A Old Second Bank 318,466 10.74 118,609 4.00 148,262 5.00 2019 Common equity tier 1 capital to risk weighted assets Consolidated $ 251,477 11.14 % $ 158,020 7.000 % N/A N/A Old Second Bank 322,496 14.35 157,315 7.000 $ 146,078 6.50 % Total capital to risk weighted assets Consolidated 327,886 14.53 236,944 10.500 N/A N/A Old Second Bank 342,280 15.23 235,978 10.500 224,741 10.00 Tier 1 capital to risk weighted assets Consolidated 308,102 13.65 191,858 8.500 N/A N/A Old Second Bank 322,496 14.35 191,026 8.500 179,789 8.00 Tier 1 capital to average assets Consolidated 308,102 11.93 103,303 4.00 N/A N/A Old Second Bank 322,496 12.50 103,199 4.00 128,998 5.00 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. Under the Federal Reserve’s Small Bank Holding Company Policy Statement, the Company is not subject to the minimum capital adequacy and capital conservation buffer capital requirements at the holding company level, unless otherwise advised by the Federal Reserve (such capital requirements are applicable only at the Bank level). Although the minimum regulatory capital requirements are not applicable to the Company, we calculate these ratios for our own planning and monitoring purposes. 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 have 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, 2020, the capital measures of the Company exclude $5.7 million, which is the Day 1 impact to retained earnings and 25% of the $10.4 million increase in the allowance for credit losses during 2020, excluding PCD loans. 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. 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
Mortgage Banking Derivatives	Dec. 31, 2020
Mortgage Banking Derivatives
Mortgage Banking Derivatives
Mortgage Banking Derivatives	Note 15: 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: 2020 2019 Forward contracts: Notional amount $ 46,500 $ 13,500 Fair value (228) (15) Rate lock commitments: Notional amount $ 37,972 $ 10,167 Fair value 1,068 265 Fair values were estimated based on changes in mortgage interest rates from the date of the commitments. The Company sold $384.4 million in loans to investors receiving proceeds of $388.5 million and resulting in a gain on sale of $15.5 million for the year ended December 31, 2020. Sales to investors included $312.0 million, or 83.2% to FNMA and $44.2 million, or 11.8%, to FHLMC for the year ended December 31, 2020. No other individual investor was sold more than 10% of the total loans sold.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
Fair Value Measurements	Dec. 31, 2020
Fair Value Measurements
Fair Value Measurements	Note 16: 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. Transfers between levels are deemed to have occurred at the end of the reporting period. At December 31, 2020 and 2019, there were no transfers between levels . 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. ● Beginning March 31, 2015, auction rate asset backed securities are priced using market spreads, cash flows, prepayment speeds, and loss analytics. This process supports the transfer to Level 2 valuations. ● 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, measured by the Company at fair value on a recurring basis are as follows: December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Securities available-for-sale U.S. Treasury $ 4,117 $ - $ - $ 4,117 U.S. government agencies - 6,657 - 6,657 U.S. government agencies mortgage-backed - 17,209 - 17,209 States and political subdivisions - 244,940 4,319 249,259 Collateralized mortgage obligations - 56,585 - 56,585 Asset-backed securities - 131,818 - 131,818 Collateralized loan obligations - 30,533 - 30,533 Loans held-for-sale - 12,611 - 12,611 Mortgage servicing rights - - 4,224 4,224 Interest rate swap agreements - 9,388 - 9,388 Mortgage banking derivatives - 840 - 840 Total $ 4,117 $ 510,581 $ 8,543 $ 523,241 Liabilities: Interest rate swap agreements, including risk participation agreements $ - $ 13,159 $ - $ 13,159 Total $ - $ 13,159 $ - $ 13,159 December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Securities available-for-sale U.S. Treasury $ 4,036 $ - $ - $ 4,036 U.S. government agencies - 8,337 - 8,337 U.S. government agencies mortgage-backed - 16,588 - 16,588 States and political subdivisions - 243,756 5,419 249,175 Collateralized mortgage obligations - 57,984 - 57,984 Asset-backed securities - 81,844 - 81,844 Collateralized loan obligations - 66,684 - 66,684 Loans held-for-sale - 3,061 - 3,061 Mortgage servicing rights - - 5,935 5,935 Interest rate swap agreements - 2,771 - 2,771 Mortgage banking derivatives - 250 - 250 Total $ 4,036 $ 481,275 $ 11,354 $ 496,665 Liabilities: Interest rate swap agreements, including risk participation agreements $ - $ 5,974 $ - $ 5,974 Total $ - $ 5,974 $ - $ 5,974 The changes in Level 3 assets and liabilities measured at fair value on a recurring basis are as follows: Year Ended December 31, 2020 Securities available-for-sale States and Mortgage Political Servicing Subdivisions Rights Beginning balance January 1, 2020 $ 5,419 $ 5,935 Total gains or losses Included in earnings (20) (2,483) Included in other comprehensive income (628) - Purchases, issuances, sales, and settlements Purchases 13,086 - Issuances - 2,288 Settlements (13,538) (1,516) Ending balance December 31, 2020 $ 4,319 $ 4,224 Year Ended December 31, 2019 Securities available-for-sale States and Mortgage Political Servicing Subdivisions Rights Beginning balance January 1, 2019 $ 8,165 $ 7,357 Total gains or losses Included in earnings (32) (1,953) Included in other comprehensive income 726 - Purchases, issuances, sales, and settlements Purchases 17,938 - Issuances - 1,240 Settlements (21,378) (709) Ending balance December 31, 2019 $ 5,419 $ 5,935 The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2020: Weighted Measured at fair value Unobservable Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs Mortgage servicing rights $ 4,224 Discounted Cash Flow Discount Rate 11.0 - 15.0% 11.0 % Prepayment Speed 5.5 - 59.1% 19.5 % The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2019: Weighted Measured at fair value Unobservable Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs Mortgage servicing rights $ 5,935 Discounted Cash Flow Discount Rate 10.0 - 58.8% 10.1 % Prepayment Speed 0.0 - 69.0% 14.1 % In addition to the above, Level 3 fair value measurement included $4.3 million for state and political subdivisions representing various local municipality securities at December 31, 2020. Level 3 fair value measurement included $5.4 million on the state and political subdivisions line at December 31, 2019. Given the small dollar amount and size of the municipality issuances involved, this is categorized as Level 3 based on the payment stream received by the Company from the municipalities. That payment stream is otherwise an unobservable input. 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, 2020 the following tables provide the level of valuation assumptions used to determine each valuation and the carrying value of the related assets: December 31, 2020 Level 1 Level 2 Level 3 Total Individually evaluated loans 1 $ - $ - $ 9,675 $ 9,675 Other real estate owned, net 2 - - 2,474 2,474 Total $ - $ - $ 12,149 $ 12,149 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 $12.3 million and a valuation allowance of $2.6 million, resulting in an increase of specific allocations within the provision for credit losses of $1.4 million for the year ending December 31, 2020. 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.5 million, which is made up of the outstanding balance of $4.1 million, net of a valuation allowance of $1.6 million at December 31, 2020. December 31, 2019 Level 1 Level 2 Level 3 Total Impaired loans 1 $ - $ - $ 7,435 $ 7,435 Other real estate owned, net 2 - - 5,004 5,004 Total $ - $ - $ 12,439 $ 12,439 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 $8.6 million and a valuation allowance of $1.2 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $783,000 for the year ending December 31, 2019. 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $5.0 million, which is made up of the outstanding balance of $12.6 million, net of a valuation allowance of $6.7 million and participations of $937,000 , at December 31, 2019. The Company also has assets that under certain conditions are subject to measurement at fair value on a nonrecurring basis. These assets include OREO and impaired loans. The Company has estimated the fair values of these assets based primarily on Level 3 inputs. OREO and impaired loans are generally valued using the fair value of collateral provided by third party appraisals. These 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
Fair Values of Financial Instruments	Dec. 31, 2020
Fair Values of Financial Instruments
Fair Values of Financial Instruments	Note 17: 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, 2020 and 2019, 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 15: Mortgage Banking Derivatives, above. The carrying amount and estimated fair values of financial instruments at December 31, were as follows: December 31, 2020 Carrying Fair Amount Value Level 1 Level 2 Level 3 Financial assets: Cash and due from banks $ 24,306 $ 24,306 $ 24,306 $ - $ - Interest earning deposits with financial institutions 305,597 305,597 305,597 - - Securities available-for-sale 496,178 496,178 4,117 487,742 4,319 FHLBC and FRBC stock 9,917 9,917 - 9,917 - Loans held-for-sale 12,611 12,611 - 12,611 - Net loans 2,000,996 2,009,773 - - 2,009,773 Interest rate swap agreements 9,388 9,388 - 9,388 - Interest rate lock commitments and forward contracts 840 840 - 840 - Interest receivable on securities and loans 9,698 9,698 - 9,698 - Financial liabilities: Noninterest bearing deposits $ 909,505 $ 909,505 $ 909,505 $ - $ - Interest bearing deposits 1,627,568 1,630,109 - 1,630,109 - Securities sold under repurchase agreements 66,980 66,980 - 66,980 - Other short-term borrowings - - - - - Junior subordinated debentures 25,773 14,658 - 14,658 - Senior notes 44,375 44,600 44,600 - - Note payable and other borrowings 23,393 24,043 - 24,043 - Interest rate swap agreements 13,071 13,071 - 13,071 - Interest payable on deposits and borrowings 418 418 - 418 - December 31, 2019 Carrying Fair Amount Value Level 1 Level 2 Level 3 Financial assets: Cash and due from banks $ 34,096 $ 34,096 $ 34,096 $ - $ - Interest earning deposits with financial institutions 16,536 16,536 16,536 - - Securities available-for-sale 484,648 484,648 4,036 475,193 5,419 FHLBC and FRBC stock 9,917 9,917 - 9,917 - Loans held-for-sale 3,061 3,061 - 3,061 - Net loans 1,911,023 1,915,531 - - 1,915,531 Interest rate swap agreements 2,771 2,771 - 2,771 - Interest rate lock commitments and forward contracts 250 250 - 250 - Interest receivable on securities and loans 9,697 9,697 - 9,697 - Financial liabilities: Noninterest bearing deposits $ 669,795 $ 669,795 $ 669,795 $ - $ - Interest bearing deposits 1,456,954 1,457,832 - 1,457,832 - Securities sold under repurchase agreements 48,693 48,693 - 48,693 - Other short-term borrowings 48,500 48,500 - 48,500 - Junior subordinated debentures 57,734 51,188 33,614 17,574 - Senior notes 44,270 46,269 46,269 - - Note payable and other borrowings 6,673 7,003 - 7,003 - Interest rate swap agreements 5,921 5,921 - 5,921 - Interest payable on deposits and borrowings 1,079 1,079 - 1,079 -

Derivatives, Hedging Activities

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2020
Derivative Excluding Mortgage Banking Derivatives
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk	Note 18: 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 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. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for the Company making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. Prior to 2019, such derivatives were used to hedge the variable cash flows associated with existing variable-rate borrowings. In December of 2019, the Company also executed a loan pool hedge of $50 million to convert variable rate loans to a fixed rate index for a five year term. 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 pool or the Company’s variable-rate borrowings. During the next twelve months, the Company estimates that an additional $182,000 will be reclassified as an increase to interest income and an additional $167,000 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. 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. 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. 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. Disclosure of Fair Values of Derivative Instruments on the Balance Sheet The Company entered into a forward starting interest rate swap on August 18, 2015, with an effective date of June 15, 2017. This transaction had a notional amount totaling $25.8 million as of December 31, 2020 and 2019, was designated as a cash flow hedge of certain junior subordinated debentures and was determined to be fully effective during the period presented. As such, no amount of ineffectiveness has been included in net income. Therefore, the aggregate fair value of the swap is recorded in 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. We expect the hedge to remain fully effective during the remaining term of the swap. The Bank will pay the counterparty a fixed rate and receive a floating rate based on three month LIBOR. The trust preferred securities In December of 2019, the Company also executed a loan pool hedge of $50.0 million to convert variable rate loans to a fixed rate index for a five year term. This transaction falls under hedge accounting standards and is paired against a pool the Bank’s Libor-based loans. Overall, the new swap only bolsters income in down rate scenarios by a modest degree. We consider the current level of interest rate risk to be moderate but intend to continue looking for market opportunities for further hedging opportunities. The Bank also has interest rate derivative positions to assist with risk management that are not designated as hedging instruments. These derivative positions relate to transactions in which the Bank enters an interest rate swap with a client while at the same time entering into an offsetting interest rate swap with another financial institution. The Bank had $17.2 million of cash collateral pledged with one correspondent financial institution and held $1.4 million of cash pledged from another correspondent bank to support interest rate swap activity at December 31, 2020, and no investment securities were required to be pledged to any correspondent financial institutions. The Bank had $114,000 of cash collateral pledged with one correspondent financial institution to support interest rate swap activity at December 31, 2019 and $11.0 million of investment securities were required to be pledged to two correspondent financial institutions. At December 31, 2020, the notional amount of non-hedging interest rate swaps was $189.1 million with a weighted average maturity of 4.7 years. At December 31, 2019, the notional amount of non-hedging interest rate swaps was $177.9 million with a weighted average maturity of 5.9 years. The Bank offsets derivative assets and liabilities that are subject to a master netting arrangement. 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, 2020 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 2,697 Other Liabilities 6,380 Total derivatives designated as hedging instruments 2,697 6,380 Derivatives not designated as hedging instruments Interest rate swaps with commercial loan customers 28 189,126 Other Assets 6,691 Other Liabilities 6,691 Interest rate lock commitments and forward contracts 205 84,472 Other Assets 840 Other Liabilities - Other contracts 4 26,523 Other Assets - Other Liabilities 88 Total derivatives not designated as hedging instruments 7,531 6,779 December 31, 2019 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 - Other Liabilities 3,150 Total derivatives designated as hedging instruments - 3,150 Derivatives not designated as hedging instruments Interest rate swaps with commercial loan customers 25 177,872 Other Assets 2,920 Other Liabilities 2,920 Interest rate lock commitments and forward contracts 87 23,667 Other Assets 250 Other Liabilities - Other contracts 4 28,176 Other Assets - Other Liabilities 53 Total derivatives not designated as hedging instruments 3,170 2,973 Disclosure of the Effect of Fair Value and Cash Flow Hedge Accounting The fair value and cash flow hedge accounting related to derivatives covered under ASC Subtopic 815-20 impacted Accumulated Other Comprehensive Income (“AOCI”) and the Income Statement. The loss recognized in AOCI on derivatives totaled $2.7 million as of December 31, 2020, and $2.3 million as of December 31, 2019. The amount of the loss reclassified from AOCI to interest income or interest expense on the income statement totaled $57,000 and $50,000 for the years ended December 31, 2020, and December 31, 2019, 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
Preferred Stock	Dec. 31, 2020
Preferred Stock.
Preferred Stock	Note 19: Preferred Stock The Series B preferred stock was issued as part of the Treasury’s Troubled Asset Relief Program and Capital Purchase Program in 2009. Concurrent with issuing the Series B preferred stock in 2009, the Company issued to the Treasury a ten year warrant to purchase 815,339 shares of the Company’s common stock at an exercise price of $13.43 per share. The Company recorded the warrant as equity, and the allocation was based on their relative fair values in accordance with accounting guidance. The fair value was determined for both the Series B preferred stock and the warrant as part of the allocation process in the amounts of $68.2 million and $4.8 million, respectively. In 2014 and 2015, the Company completed redemption of all 73,000 shares of Series B preferred stock issued in 2009. On January 16, 2019, the warrant was exercised; see further disclosures in Note 12: Earnings Per Share, above. Preferred stock of 300,000 shares is authorized but unissued as of December 31, 2020 and 2019.

Parent Company Condensed Financ

Parent Company Condensed Financial Information	12 Months Ended
Parent Company Condensed Financial Information	Dec. 31, 2020
Parent Company Condensed Financial Information
Parent Company Condensed Financial Information	Note 20: Parent Company Condensed Financial Information Condensed Balance Sheets for the years ended December 31, were as follows: 2020 2019 Assets Noninterest bearing deposit with bank subsidiary $ 47,601 $ 26,562 Investment in subsidiaries 353,722 352,703 Other assets 3,270 3,981 Total assets $ 404,593 $ 383,246 Liabilities and Stockholders’ Equity Junior subordinated debentures $ 25,773 $ 57,734 Senior notes 44,375 44,270 Notes Payable 17,000 - Other liabilities 10,358 3,378 Stockholders’ equity 307,087 277,864 Total liabilities and stockholders' equity $ 404,593 $ 383,246 Condensed Statements of Income for the years ended December 31 were as follows: 2020 2019 2018 Operating Income Cash dividends received from subsidiaries $ 41,300 $ 20,000 $ 30,000 Other income 32 109 106 Total operating income 41,332 20,109 30,106 Operating Expenses Junior subordinated debentures 2,216 3,724 3,716 Senior notes 2,693 2,700 2,688 Notes payable 362 - - Other interest expense - 13 98 Other expenses 3,669 4,025 4,208 Total operating expense 8,940 10,462 10,710 Income before income taxes and equity in undistributed net income of subsidiaries 32,392 9,647 19,396 Income tax benefit (2,215) (3,187) (3,355) Income before equity in undistributed net income of subsidiaries 34,607 12,834 22,751 Equity in undistributed net income of subsidiaries (6,782) 26,621 11,261 Net income available to common stockholders $ 27,825 $ 39,455 $ 34,012 Condensed Statements of Cash Flows for the years ended December 31, were as follows: 2020 2019 2018 Cash Flows from Operating Activities Net Income $ 27,825 $ 39,455 $ 34,012 Adjustments to reconcile net income to net cash from operating activities: Equity in undistributed net income of subsidiaries 6,782 (26,621) (11,261) Provision for deferred tax expense (benefit) (514) 4,186 6,697 Change in taxes payable 5,933 3,896 (1,211) Change in other assets 954 - 97 Stock-based compensation 2,089 2,516 2,257 Other, net 682 (80) 172 Net cash provided by (used in) operating activities 43,751 23,352 30,763 Cash Flows from Investing Activities Cash paid for acquisition, net of cash and cash equivalents retained - - (47,074) Net cash used in investing activities - - (47,074) Cash Flows from Financing Activities Net change in other short-term borrowings - (4,000) 4,000 Dividend paid on common stock (1,186) (1,195) (1,189) Purchases of treasury stock (5,922) (666) (505) Redemption of junior subordinated debentures (32,604) - - Issuance of term note 20,000 - - Repayment of term note (3,000) - - Proceeds from exercise of stock option - 32 33 Net cash (used in) provided by financing activities (22,712) (5,829) 2,339 Net change in cash and cash equivalents 21,039 17,523 (13,972) Cash and cash equivalents at beginning of year 26,562 9,039 23,011 Cash and cash equivalents at end of year $ 47,601 $ 26,562 $ 9,039

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
Employee Benefit Plans	Dec. 31, 2020
Employee Benefit Plans
Employee Benefit Plans	Note 21: 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; these service requirements were shortened in 2020 from eligibility the first day of a quarter after 90 days of service to the first day of a month after 30 days of service. 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, 2020, 2019 and 2018, 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, 2020, 2019 and 2018. The total expense relating to the 401(k) Plan was approximately $1.2 million in 2020 and $1.1 million in both 2019 and 2018. 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, 2020, 2019 and 2018 and are included in other liabilities.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2020
Summary of Significant Accounting Policies
Basis of presentation	Nature of Operations The consolidated financial statements of the Company include the financial statements of the Bank and its wholly-owned subsidiaries, River Street Advisors, LLC, an investment advisory/management service company, Old Second Affordable Housing Fund, L.L.C., which provides down payment assistance for home ownership to qualified individuals, and Station I, LLC, which holds property acquired by the Bank through foreclosure or in the ordinary course of collecting a debt previously contracted with borrowers. The Company uses the accrual basis of accounting for financial reporting purposes. Certain amounts in prior year financial statements have been reclassified to conform to the 2020 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 gains (losses), 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 income (loss), 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 uncollectability 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 a collective basis is allocated to individual loans. 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. Subsequent changes to the allowance for credit losses are recorded through provision for credit losses. On January 1, 2020, the Company implemented ASU No. 2016-13, “Financial Instruments – Credit Measurement of Credit Losses on Financial Instruments (Topic 326),” also known as Current Expected Credit Losses, or CECL. As a result of CECL implementation, the Company’s purchase credit impaired loans (“PCI loans”) became PCD loans.
Allowance for Credit Losses ("ACL")	Allowance for Credit Losses 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 income 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.
Other Real Estate Owned ("OREO")	Other Real Estate Owned (“OREO”) decrease between the recorded value and the updated fair value less costs to sell. Such declines are included in other noninterest expense in the Consolidated Statements of Income. A subsequent reversal of an OREO valuation adjustment can occur, but the resultant carrying value cannot exceed the cost basis established at transfer of the loan to OREO. Operating costs after acquisition are also expensed.
Mortgage Servicing Rights	Mortgage Servicing Rights Mortgage loans that the Company is servicing for others aggregated to $793.5 million and $723.4 million at December 31, 2020, and 2019, 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.
Bank-Owned Life Insurance ("BOLI")	Bank-Owned Life Insurance (“BOLI”)
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible Due to the significant deteriorations of economic conditions stemming from the COVID-19 pandemic in the first quarter of 2020, the Company assessed impairment indicators and determined it was more likely than not the Company’s fair value exceeded its carrying value. Due to the decline in the trading price of our common stock and an elevated U.S. unemployment rate, we performed interim impairment evaluations at March 31, June 30 and September 30, 2020. At each quarter-end, we analyzed the current and expected impact of the pandemic on our business, operations, and financial condition and determined it was more likely than not the Company’s fair value exceeded its carrying value, as the negative market indicators were not observed over a sustained period of time. We performed our annual impairment test at November 30, 2020, and elected to first conduct a qualitative analysis to determine if a quantitative analysis was necessary. We analyzed the changes in the negative market indicators discussed above from September 30, 2020, the date of the most recent interim impairment test, to November 30, 2020. The result of this comparison showed an improvement in the U.S. unemployment rate from 7.9% to 6.7%, and an increase in the trading price of our common stock of 28.8%. We also analyzed the impact of the pandemic on our business, operations, and financial condition prior to November 30, 2020 as well as the expected impact in the future, in light of the improving trends discussed above. As a result of the November 30, 2020, qualitative analysis, we determined goodwill was not impaired as it was more likely than not the Company’s fair value exceeded its carrying value. Accordingly, a quantitative analysis was not performed. The Company’s November 30, 2019, qualitative goodwill assessment resulted in the Company determining goodwill was not impaired, as it was more likely than not the Company’s fair value exceeded its carrying value. The core deposit intangible (“CDI”) is being amortized on an accelerated method over a ten year estimated useful life. As of December 31, 2020, $2.2 million of CDI remained, stemming from the Company’s purchase of ABC Bank in 2018 and the Talmer branch purchase in 2016. Total CDI amortization expense of $494,000, $539,000 and $387,000 was recorded in 2020, 2019, and 2018, respectively. The expected future annual amortization expense for each of the next five years (2021-2025) is approximately $459,000 , $421,000 , $379,000 , $331,000 , and $274,000 .
Debt Issuance Costs	Debt Issuance Costs – Costs associated with the issuance of debt are presented in the Consolidated Balance Sheet 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 –
Wealth Management	Wealth Management
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, 2020 and 2019, 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, 2020 and 2019. The Company is currently open to audit under the statute of limitations by the Internal Revenue Service from 2017 to 2019, the state of Illinois from 2017 to 2019, the states of Wisconsin and Indiana from 2010 to 2019, the state of Texas from 2016 to 2019, and Florida for 2019.
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 2016-13 Measurement of Credit Losses on Financial Instruments (Topic 326)” Based on our portfolio composition at December 31, 2019, and the economic environment at that time, we recorded an overall increase in our ACL for loans and leases of $5.9 million and an ACL for unfunded commitments of $1.7 million as of January 1, 2020, the date we adopted CECL. Approximately $2.5 million of the increase to the ACL on loans resulted from the transfer of the non-accretable purchase accounting adjustments on purchased credit impaired loans. There was no impact from adoption of CECL on securities available-for sale. As a result of the adoption of this new standard on January 1, 2020, we recorded a reduction to retained earnings of approximately $3.8 million, which was net of the $1.4 million deferred tax asset impact stemming from adoption. ASU 2018-16, ASU 2020-04 and ASU 2021-01 - 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 has formed a LIBOR transition team, and has developed a project plan 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 International Swaps and Derivatives Association (“ISDA”) protocol adherence for LIBOR fallback language for all commercial swaps, has met with our commercial loan clients to also guide their swap fallback language adherence, and worked to revise all credit documents being issued by our Bank for new loans to ensure appropriate fallback language is included. We continue to meet regularly to address ongoing talks on the project plan, such as structuring final transition timelines to cease the issuance of any LIBOR referenced products. This project is ongoing, but the Company anticipates being ready for the proposed LIBOR cessation at the end of 2021.
Subsequent Events	Subsequent Events On January 19, 2021, the Company’s Board of Directors declared a cash dividend of $0.01 per share payable on February 8, 2021, to stockholders of record as of January 29, 2021.
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
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
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 ( 6.0 years) 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 ( 4.5 years) 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”) ● HELOC legacy - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections. ● HELOC purchased - The Company’s historical loss rates are utilized from the prior periods which align to the current unemployment projections; in addition, the peer data source used for loss rate analysis is the correspondent bank from which we purchased the 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 legacy HELOC segments; and (iii) a WARM (weighted average remaining life) methodology is used for lease financing receivables, HELOCs purchased, and consumer segments. For loan pools sub-segmented by risk level, which include commercial, real estate-commercial and multifamily segments, linear regression methods were utilized along with expected industry performance over the next twelve months to determine what level of qualitative adjustment would be necessary to account for expected risk rating migration. This methodology relied heavily on existing and anticipated weighted risk ratings by industry or property type. The forecast period used for each segment calculation was one year. 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, regionally 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. 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
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.

Securities (Tables)

Securities (Tables)	12 Months Ended
Securities (Tables)	Dec. 31, 2020
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, 2020 Cost 1 Gains Losses Value Securities available-for-sale U.S. Treasury $ 4,014 $ 103 $ - $ 4,117 U.S. government agencies 6,811 - (154) 6,657 U.S. government agencies mortgage-backed 16,098 1,112 (1) 17,209 States and political subdivisions 229,352 21,269 (1,362) 249,259 Collateralized mortgage obligations 53,999 2,866 (280) 56,585 Asset-backed securities 130,959 1,370 (511) 131,818 Collateralized loan obligations 30,728 15 (210) 30,533 Total securities available-for-sale $ 471,961 $ 26,735 $ (2,518) $ 496,178 Gross Gross Amortized Unrealized Unrealized Fair December 31, 2019 Cost 1 Gains Losses Value Securities available-for-sale U.S. Treasury $ 4,010 $ 26 $ - $ 4,036 U.S. government agencies 8,502 - (165) 8,337 U.S. government agencies mortgage-backed 16,164 443 (19) 16,588 States and political subdivisions 240,399 11,207 (2,431) 249,175 Collateralized mortgage obligations 57,059 963 (38) 57,984 Asset-backed securities 82,114 617 (887) 81,844 Collateralized loan obligations 66,898 29 (243) 66,684 Total securities available-for-sale $ 475,146 $ 13,285 $ (3,783) $ 484,648 1 Excludes interest receivable of $2.7 million and $3.2 million at December 31, 2020 and December 31, 2019, 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 $ 423 2.09 % $ 427 Due after one year through five years 5,833 2.11 6,062 Due after five years through ten years 27,802 2.33 29,027 Due after ten years 206,119 3.02 224,517 240,177 2.92 260,033 Mortgage-backed and collateralized mortgage obligations 70,097 2.95 73,794 Asset-backed securities 130,959 1.37 131,818 Collateralized loan obligations 30,728 2.04 30,533 Total securities available-for-sale $ 471,961 2.44 % $ 496,178
Schedule of amortized cost and fair value of securities that exceed 10% of stockholders equity	December 31, 2020 Amortized Fair Issuer Cost Value Towd Point Mortgage Trust 33,198 35,479
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	Less than 12 months 12 months or more December 31, 2020 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. government agencies - $ - $ - 4 $ 154 $ 6,657 4 $ 154 $ 6,657 U.S. government agencies mortgage-backed 1 1 141 - - - 1 1 141 States and political subdivisions - - - 1 1,362 3,433 1 1,362 3,433 Collateralized mortgage obligations 4 279 8,142 1 1 146 5 280 8,288 Asset-backed securities 1 2 251 3 509 49,572 4 511 49,823 Collateralized loan obligations 1 31 7,468 4 179 21,477 5 210 28,945 Total securities available-for-sale 7 $ 313 $ 16,002 13 $ 2,205 $ 81,285 20 $ 2,518 $ 97,287 Less than 12 months 12 months or more December 31, 2019 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. government agencies - $ - $ - 4 $ 165 $ 8,337 4 $ 165 $ 8,337 U.S. government agencies mortgage-backed 3 10 3,018 2 9 843 5 19 3,861 States and political subdivisions 6 1,665 41,043 2 766 6,593 8 2,431 47,636 Collateralized mortgage obligations 2 26 9,054 2 12 1,209 4 38 10,263 Asset-backed securities 4 839 54,540 1 48 3,238 5 887 57,778 Collateralized loan obligations 4 62 21,927 4 181 25,020 8 243 46,947 Total securities available-for-sale 19 $ 2,602 $ 129,582 15 $ 1,181 $ 45,240 34 $ 3,783 $ 174,822
Schedule of proceeds from sale and gross realized gains and losses on sale of securities	Year Ended December 31, Securities available-for-sale 2020 2019 2018 Proceeds from sales of securities $ 18,006 $ 191,298 $ 94,663 Gross realized gains on securities 17 5,521 369 Gross realized losses on securities (42) (1,010) (9) Net realized (losses) gains $ (25) $ 4,511 $ 360 Income tax (expense) benefit on net realized gains (losses) $ 7 $ (1,267) $ (100) Effective tax rate applied 28.0 % 28.1 % 27.8 %

Loans and Allowance for Credi_2

Loans and Allowance for Credit Losses on Loans (Tables)	12 Months Ended
Loans and Allowance for Credit Losses on Loans (Tables)	Dec. 31, 2020
Loans and Allowance for Credit Losses on Loans
Schedule of major classifications of loans	2020 2019 Commercial 1 $ 407,159 $ 332,842 Leases 141,601 119,751 Commercial real estate - Investor 582,042 520,095 Commercial real estate - Owner occupied 333,070 345,504 Construction 98,486 69,617 Residential real estate - Investor 56,137 71,105 Residential real estate - Owner occupied 116,388 136,023 Multifamily 189,040 189,773 HELOC 80,908 91,605 HELOC - Purchased 19,487 31,852 Other 2 10,533 12,258 Total loans, excluding deferred loan costs and PCI loans 3 2,034,851 1,920,425 Net deferred loan costs - 1,786 Total loans, excluding PCI loans 3 2,034,851 1,922,211 PCI loans - 8,601 Total loans, including deferred loan costs and PCI loans 3 $ 2,034,851 $ 1,930,812 Allowance for credit losses on loans (33,855) (19,789) Net loans 4 $ 2,000,996 $ 1,911,023 1 Includes $74.1 million of PPP loans at December 31, 2020 2 Unless otherwise noted, the “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 4 - Loans and Allowance for Credit Losses on Loans. 3 After the Company’s adoption of CECL, all PCD loans are included within each relevant portfolio segment and are not separately reported as PCI loans. 4 Excludes accrued interest receivable of $7.0 million and $6.5 million at December 31, 2020 and December 31, 2019, respectively, that 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, 2020: Impact of Provision Beginning Adopting for Credit Ending Balance ASC 326 Losses Charge-offs Recoveries Balance 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) 4,075 512 165 9,205 Commercial real estate - Owner occupied 3,678 (848) 487 1,763 697 2,251 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 (1,198) 127 387 1,749 HELOC - Purchased - - 265 66 - 199 Other 640 607 445 244 170 1,618 Ending Balance, December 31, 2020 $ 19,789 $ 5,879 $ 9,166 $ 3,068 $ 2,089 $ 33,855 The following table presents activity in the allowance for loan and lease losses for the years ended December 31, 2019 and December 31, 2018, as determined in accordance with ASC 310 prior to the adoption of ASU 2016-13: Provision Beginning for Loan Ending Allowance for loan and lease losses: Balance Losses Charge-offs Recoveries Balance Commercial $ 2,832 $ 218 $ 109 $ 74 $ 3,015 Leases 734 577 49 - 1,262 Commercial real estate - Investor 6,339 (497) 303 679 6,218 Commercial real estate - Owner occupied 3,515 874 716 5 3,678 Construction 969 (448) 9 1 513 Residential real estate - Investor 554 43 7 11 601 Residential real estate - Owner occupied 1,377 (86) 111 77 1,257 Multifamily 616 813 - 15 1,444 HELOC 1,449 (351) 109 172 1,161 HELOC - Purchased - 229 229 - - Other 621 228 409 200 640 Ending Balance, December 31, 2019 $ 19,006 $ 1,600 $ 2,051 $ 1,234 $ 19,789 Provision Beginning for Loan Ending Allowance for loan and lease losses: Balance Losses Charge-offs Recoveries Balance Commercial $ 2,453 $ 263 $ 41 $ 157 $ 2,832 Leases 692 55 13 - 734 Commercial real estate - Investor 5,020 2,255 1,376 440 6,339 Commercial real estate - Owner occupied 3,157 523 172 7 3,515 Construction 923 (5) (16) 35 969 Residential real estate - Investor 542 (110) (13) 109 554 Residential real estate - Owner occupied 1,304 (784) (10) 847 1,377 Multifamily 1,345 (941) (22) 190 616 HELOC 1,446 (214) 147 364 1,449 HELOC - Purchased - - - - - Other 579 186 409 265 621 Ending Balance, December 31, 2018 $ 17,461 $ 1,228 $ 2,097 $ 2,414 $ 19,006
Schedule of collateral dependent loans and related loan allowances.	Accounts ACL December 31, 2020 Real Estate Receivable Equipment Other Total Allocation Commercial $ - $ 1,070 $ - $ 55 $ 1,125 $ 56 Leases - - 2,377 597 2,974 880 Commercial real estate - Investor 4,179 - - - 4,179 84 Commercial real estate - Owner occupied 9,726 - - - 9,726 195 Construction 1,891 - - - 1,891 952 Residential real estate - Investor 928 - - - 928 - Residential real estate - Owner occupied 3,535 - - - 3,535 10 Multifamily 3,838 - - - 3,838 378 HELOC 1,053 - - - 1,053 78 HELOC - Purchased - - - - - - Other - - - 4 4 4 Total $ 25,150 $ 1,070 $ 2,377 $ 656 $ 29,253 $ 2,637
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, 2020 1 Past Due Past Due Due Due Current Total Loans Accruing Commercial $ - $ - $ 52 $ 52 $ 407,107 $ 407,159 $ - Leases 613 59 316 988 140,613 141,601 163 Commercial real estate - Investor 1,439 - 1,108 2,547 579,495 582,042 - Commercial real estate - Owner occupied 1,848 958 7,309 10,115 322,955 333,070 - Construction 1,237 - - 1,237 97,249 98,486 - Residential real estate - Investor 1,022 20 484 1,526 54,611 56,137 157 Residential real estate - Owner occupied 859 286 717 1,862 114,526 116,388 114 Multifamily 3,282 467 - 3,749 185,291 189,040 - HELOC 549 50 206 805 80,103 80,908 - HELOC - Purchased 47 - - 47 19,440 19,487 - Other 20 - - 20 10,513 10,533 - Total $ 10,916 $ 1,840 $ 10,192 $ 22,948 $ 2,011,903 $ 2,034,851 $ 434 1 Loans modified under the CARES Act are considered current if they are in compliance with the modified terms. Recorded Investment 90 days or 90 Days or Greater Past 30-59 Days 60-89 Days Greater Past Total Past Due and December 31, 2019 Past Due Past Due Due Due Current Nonaccrual Total Loans Accruing Commercial $ 1,271 $ 925 $ 2,103 $ 4,299 $ 328,399 $ 144 $ 332,842 $ 2,132 Leases 362 - 81 443 118,979 329 119,751 128 Commercial real estate - Investor 626 95 343 1,064 517,336 1,695 520,095 348 Commercial real estate - Owner occupied 2,469 1,026 - 3,495 336,829 5,180 345,504 - Construction 26 - - 26 69,498 93 69,617 - Residential real estate - Investor 141 125 - 266 70,051 788 71,105 - Residential real estate - Owner occupied 3,450 1,351 - 4,801 128,650 2,572 136,023 - Multifamily 10 1,700 - 1,710 187,995 68 189,773 - HELOC 735 50 18 803 89,438 1,364 91,605 20 HELOC - Purchased - - - - 31,672 180 31,852 - Other 1 28 - - 28 13,997 19 14,044 - Total, excluding PCI 9,118 5,272 2,545 16,935 1,892,844 12,432 1,922,211 2,628 PCI loans, net of purchase accounting adjustments 261 - - 261 5,377 2,963 8,601 - Total $ 9,379 $ 5,272 $ 2,545 $ 17,196 $ 1,898,221 $ 15,395 $ 1,930,812 $ 2,628 1 The “Other” class includes consumer loans, overdrafts and net deferred costs.
Schedule of Loans Inactive Deferral	December 31, 2020 1st Deferral 2nd Deferral 3rd Deferral Total Loans modified under CARES Act, in deferral $ 9,431 $ 19,906 $ 3,408 $ 32,745 Loans modified under CARES Act, in nonaccrual, within deferral above 999 1,230 2,121 4,350
Schedule of loans on nonaccrual for which there was no related allowance	December 31, 2020 December 31, 2019 Nonaccrual Nonaccrual Nonaccrual With no ACL Nonaccrual With no ACL Commercial $ 1,125 $ 1,070 $ 144 $ - Leases 2,638 309 329 70 Commercial real estate - Investor 1,632 1,632 1,695 1,590 Commercial real estate - Owner occupied 9,262 6,780 5,180 2,366 Construction - - 93 93 Residential real estate - Investor 928 928 788 788 Residential real estate - Owner occupied 3,206 3,206 2,572 2,475 Multifamily 2,437 2,437 68 68 HELOC 1,052 845 1,364 1,154 HELOC - Purchased - - 180 180 Other 1 - - 19 2 Total, excluding PCI loans 22,280 17,207 12,432 8,786 PCI loans, net of purchase accounting adjustments - - 2,963 2,963 Total $ 22,280 $ 17,207 $ 15,395 $ 11,749
Schedule of credit quality indicators by class of loans	Credit Quality Indicators by class of loans as of December 31, were as follows: Revolving Loans Converted Revolving To Term 2020 2019 2018 2017 2016 Prior Loans Loans Total Commercial Pass $ 101,796 $ 42,294 $ 14,519 $ 6,265 $ 1,825 $ 1,691 $ 230,388 $ - $ 398,778 Special Mention 5,130 425 68 - 3 - 76 - 5,702 Substandard 273 52 1,524 - - - 830 - 2,679 Total commercial 107,199 42,771 16,111 6,265 1,828 1,691 231,294 - 407,159 Leases Pass 56,605 52,168 16,830 6,545 5,242 651 - - 138,041 Special Mention 175 163 - - - - - - 338 Substandard - 1,434 798 59 450 481 - - 3,222 Total leases 56,780 53,765 17,628 6,604 5,692 1,132 - - 141,601 Commercial real estate - Investor Pass 173,781 158,677 92,156 66,762 55,963 15,966 1,319 - 564,624 Special Mention 2,394 9,592 220 - 95 - - - 12,301 Substandard 2,709 1,126 71 - 340 871 - - 5,117 Total commercial real estate - investor 178,884 169,395 92,447 66,762 56,398 16,837 1,319 - 582,042 Commercial real estate - Owner occupied Pass 72,605 52,809 73,719 45,315 50,000 25,507 1,324 - 321,279 Special Mention 604 - - - - - - - 604 Substandard 1,564 2,154 1,780 1,664 501 3,524 - - 11,187 Total commercial real estate - owner occupied 74,773 54,963 75,499 46,979 50,501 29,031 1,324 - 333,070 Construction Pass 50,170 24,163 7,203 539 218 1,261 9,702 - 93,256 Special Mention 38 - - - - - - - 38 Substandard - 3,135 2,057 - - - - - 5,192 Total construction 50,208 27,298 9,260 539 218 1,261 9,702 - 98,486 Residential real estate - Investor Pass 9,371 14,194 8,522 7,775 2,431 11,184 1,144 - 54,621 Special Mention - - - - - - - - - Substandard 349 - 610 - 91 466 - - 1,516 Total residential real estate - investor 9,720 14,194 9,132 7,775 2,522 11,650 1,144 - 56,137 Residential real estate - Owner occupied Pass 18,308 23,450 10,808 15,409 10,394 31,325 2,654 - 112,348 Special Mention - - - - - - - - - Substandard 47 - 412 219 526 2,836 - - 4,040 Total residential real estate - owner occupied 18,355 23,450 11,220 15,628 10,920 34,161 2,654 - 116,388 Multifamily Pass 40,671 30,849 44,301 38,133 12,147 7,735 197 - 174,033 Special Mention - 6,901 - 548 - - - - 7,449 Substandard 69 - 4,254 927 118 2,190 - - 7,558 Total multifamily 40,740 37,750 48,555 39,608 12,265 9,925 197 - 189,040 HELOC Pass 2,511 2,174 1,679 2,120 504 803 69,483 - 79,274 Special Mention - - - - - - 94 - 94 Substandard - - 86 37 271 91 1,055 - 1,540 Total HELOC 2,511 2,174 1,765 2,157 775 894 70,632 - 80,908 HELOC - Purchased Pass - - - - - 19,487 - - 19,487 Special Mention - - - - - - - - - Substandard - - - - - - - - - Total HELOC - purchased - - - - - 19,487 - - 19,487 Other Pass 1,555 574 569 229 559 341 6,702 - 10,529 Special Mention - - - - - - - - - Substandard - - 4 - - - - - 4 Total other 1,555 574 573 229 559 341 6,702 - 10,533 Total loans Pass 527,373 401,352 270,306 189,092 139,283 115,951 322,913 - 1,966,270 Special Mention 8,341 17,081 288 548 98 - 170 - 26,526 Substandard 5,011 7,901 11,596 2,906 2,297 10,459 1,885 - 42,055 Total loans $ 540,725 $ 426,334 $ 282,190 $ 192,546 $ 141,678 $ 126,410 $ 324,968 $ - $ 2,034,851 Credit quality indicators by loan segment at December 31, 2019 were as follows: December 31, 2019 Special Pass Mention Substandard Doubtful Total Commercial $ 307,948 $ 13,206 $ 11,688 $ - $ 332,842 Leases 119,045 377 329 - 119,751 Commercial real estate - Investor 510,640 4,529 4,926 520,095 Commercial real estate - Owner occupied 330,891 6,657 7,956 - 345,504 Construction 69,355 - 262 - 69,617 Residential real estate - Investor 69,715 - 1,390 - 71,105 Residential real estate - Owner occupied 132,258 134 3,631 - 136,023 Multifamily 187,560 1,710 503 - 189,773 HELOC 89,804 12 1,789 - 91,605 HELOC - Purchased 31,672 - 180 - 31,852 Other 1 13,685 - 359 - 14,044 Total, excluding PCI loans $ 1,862,573 $ 26,625 $ 33,013 $ - $ 1,922,211 PCI loans, net of purchase accounting adjustments 573 261 7,767 - 8,601 Total $ 1,863,146 $ 26,886 $ 40,780 $ - $ 1,930,812 1 The “Other” class includes consumer, overdrafts and net deferred costs.
Schedule of TDRs modified during the period by type of modification	TDR Modifications Year Ended December 31, 2020 # of Pre-modification Post-modification contracts balance balance Troubled debt restructurings Residential real estate - Owner occupied HAMP 1 3 $ 410 $ 395 Total 3 $ 410 $ 395 TDR Modifications Year Ended December 31, 2019 # of Pre-modification Post-modification contracts balance balance Troubled debt restructurings Commercial real estate - Investor Other 2 2 $ 1,217 $ 1,200 Commercial real estate - Owner Occupied Deferral 3 1 421 418 Residential real estate - Owner occupied HAMP 1 3 399 293 HELOC Other 2 1 39 38 Total 7 $ 2,076 $ 1,949 1 HAMP: Home Affordable Modification Program 2 Other: Change of terms from bankruptcy court 3 Deferral: Refers to the deferral of principal
Schedule of loans to principal officers, directors, and their affiliates, made in the ordinary course of business	2020 2019 Beginning balance $ 961 $ 1,417 New loans 644 634 Repayments and other reductions (822) (1,025) Change in related party status - (65) Ending balance $ 783 $ 961

Other Real Estate Owned (Tables

Other Real Estate Owned (Tables)	12 Months Ended
Other Real Estate Owned (Tables)	Dec. 31, 2020
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 2020 2019 2018 Balance at beginning of period $ 5,004 $ 7,175 $ 8,371 Property additions, net of acquisition adjustments 898 872 3,316 Property improvements - - 59 Less: Proceeds from property disposals, net of participation purchase and of gains/losses 3,071 2,515 3,990 Period valuation adjustments 357 519 581 Other adjustments - 9 - Balance at end of period $ 2,474 $ 5,004 $ 7,175
Schedule of activity in valuation allowance	Twelve Months Ended December 31, 2020 2019 2018 Balance at beginning of period $ 6,712 $ 8,027 $ 8,208 Provision for unrealized losses 357 519 581 Reductions taken on sales (5,426) (1,834) (762) Balance at end of period $ 1,643 $ 6,712 $ 8,027
Schedule of expenses related to foreclosed assets, net of lease revenue	Twelve Months Ended December 31, 2020 2019 2018 Gain on sales, net $ (204) $ (264) $ (792) Provision for unrealized losses 357 519 581 Operating expenses 535 173 649 Less: Lease revenue 37 5 42 Net OREO expense $ 651 $ 423 $ 396

Premises and Equipment (Tables)

Premises and Equipment (Tables)	12 Months Ended
Premises and Equipment (Tables)	Dec. 31, 2020
Premises and Equipment
Schedule of components of premises and equipment	2020 2019 Accumulated Accumulated Depreciation/ Net Book Depreciation/ Net Book Cost Amortization Value Cost Amortization Value Land $ 18,501 $ - $ 18,501 $ 18,501 $ - $ 18,501 Buildings 43,579 25,909 17,670 43,457 24,912 18,545 Leasehold improvements 2,324 699 1,625 2,314 399 1,915 Furniture and equipment 51,461 43,780 7,681 47,696 42,303 5,393 Total Premises and Equipment $ 115,865 $ 70,388 $ 45,477 $ 111,968 $ 67,614 $ 44,354

Deposits (Tables)

Deposits (Tables)	12 Months Ended
Deposits (Tables)	Dec. 31, 2020
Deposits
Schedule of major classifications of deposits	2020 2019 Noninterest bearing demand $ 909,505 $ 669,795 Savings 399,057 307,015 NOW accounts 486,612 425,792 Money market accounts 316,465 282,478 Certificates of deposit of less than $100,000 200,107 227,578 Certificates of deposit of $100,000 through $250,000 164,982 151,279 Certificates of deposit of more than $250,000 60,345 62,812 Total deposits $ 2,537,073 $ 2,126,749
Summary of scheduled maturities of time deposits	2021 $ 349,003 2022 30,295 2023 18,308 2024 7,774 2025 20,054 Total time deposits $ 425,434

Borrowings (Tables)

Borrowings (Tables)	12 Months Ended
Borrowings (Tables)	Dec. 31, 2020
Borrowings
Summary of borrowings and junior subordinated debentures	2020 2019 Securities sold under repurchase agreements $ 66,980 $ 48,693 Other short-term borrowings 1 - 48,500 Junior subordinated debentures 2 25,773 57,734 Senior notes 44,375 44,270 Notes payable and other borrowings 23,393 6,673 Total borrowings $ 160,521 $ 205,870 1 Includes short-term FHLBC advances and the outstanding portion of an operating line of credit. 2 See Note 9: Junior Subordinated Debentures, below.
Summary of scheduled maturities and weighted average rates of borrowings	2020 2019 Weighted Weighted Average Average Balance Rate Balance Rate 2020 $ - - $ 97,193 1.85 % 2021 70,980 0.46 % - - 2022 4,000 1.91 - - 2023 9,000 1.91 - - 2024 - - - - 2025 - - - - Thereafter 76,541 5.24 108,677 6.11 Total borrowings $ 160,521 2.86 % $ 205,870 4.10 %

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2020
Income Taxes
Schedule of components of income tax expense (benefit)	2020 2019 2018 Current federal $ 6,269 $ 4,815 $ - Current state 3,960 1,151 84 Deferred federal (135) 3,177 6,226 Deferred state (511) 3,259 3,614 Total income tax expenses $ 9,583 $ 12,402 $ 9,924
Schedule of components of deferred tax assets and liabilities	2020 2019 Allowance for credit losses $ 11,058 $ 6,082 Deferred compensation 1,093 907 Goodwill amortization/impairment 2,212 3,456 Stock based compensation 1,356 1,622 Business combination adjustments 255 1,547 OREO write-downs 614 1,931 Federal recognized built-in loss ("RBIL") carryforward 142 340 State net operating loss and RBIL carryforward 60 326 Other assets 2,182 2,270 Total deferred tax assets 18,972 18,481 Accumulated depreciation on premises and equipment (1,237) (746) Mortgage servicing rights (1,261) (1,779) Amortization of core deposit intangible (171) (144) State tax benefits (930) (927) Other liabilities (1,481) (1,637) Total deferred tax liabilities (5,080) (5,233) Net deferred tax asset before adjustments related to other comprehensive income 13,892 13,248 Tax effect of adjustments related to other comprehensive income (5,771) (1,789) Net deferred tax asset $ 8,121 $ 11,459
Schedule of components of provision for deferred income taxes	2020 2019 2018 Provision for credit losses $ (4,976) $ (279) $ (426) Deferred compensation (186) (242) (15) Amortization of core deposit intangible 27 14 957 Stock based compensation 266 (245) (511) Business combination adjustments 1,292 985 927 OREO write-downs 1,317 406 48 Federal net operating loss and RBIL carryforward 198 1,859 5,041 State net operating loss and RBIL carryforward 266 3,708 2,986 Depreciation 491 303 59 Mortgage servicing rights (518) (431) 124 Goodwill amortization/impairment 1,244 1,242 1,389 State tax benefits 3 (912) (550) Other, net (70) 28 (189) Total deferred tax (benefit) expense $ (646) $ 6,436 $ 9,840
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: 2020 2019 2018 Tax at statutory federal income tax rate $ 7,856 $ 10,890 $ 9,227 Nontaxable interest income, net of disallowed interest deduction (1,067) (1,409) (1,600) BOLI income (271) (480) (422) State income taxes, net of federal benefit 2,570 3,496 2,927 Stock based compensation 297 (207) (305) Other, net 198 112 97 Total tax at effective tax rate $ 9,583 $ 12,402 $ 9,924

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	12 Months Ended
Equity Compensation Plans (Tables)	Dec. 31, 2020
Equity Compensation Plans
Summary of stock option activity as of each year	A summary of stock option activity as of each year is as follows: 2020 2019 2018 Intrinsic value of options exercised $ - $ 27 $ 27 Cash received from option exercises - 32 33 Tax benefit realized from option exercises - 5 5 Weighted average fair value of options granted - - -
Summary of changes in nonvested shares of restricted share rights	December 31, 2020 Weighted Restricted Average Stock Shares Grant Date and Units Fair Value Unvested at January 1 555,283 $ 12.85 Granted 140,944 12.18 Vested (149,952) 11.16 Forfeited (13,666) 12.97 Unvested at December 31 532,609 $ 13.15

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
Earnings Per Share (Tables)	Dec. 31, 2020
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): 2020 2019 2018 Basic earnings per share: Weighted-average common shares outstanding 29,623,333 29,891,046 29,728,308 Net income $ 27,825 $ 39,455 $ 34,012 Basic earnings per share $ 0.94 $ 1.32 $ 1.14 Diluted earnings per share: Weighted-average common shares outstanding 29,623,333 29,891,046 29,728,308 Dilutive effect of unvested restricted awards 1 550,739 525,302 532,692 Dilutive effect of stock options and warrants - - 47,935 Diluted average common shares outstanding 30,174,072 30,416,348 30,308,935 Net Income $ 27,825 $ 39,455 $ 34,012 Diluted earnings per share $ 0.92 $ 1.30 $ 1.12 1 Includes the common stock equivalents for restricted share rights that are dilutive.

Commitments (Tables)

Commitments (Tables)	12 Months Ended
Commitments (Tables)	Dec. 31, 2020
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, 2020 December 31, 2019 Fixed Variable Total Fixed Variable Total Letters of credit: Borrower: Financial standby $ 329 $ 9,051 $ 9,380 $ 339 $ 9,612 $ 9,951 Commercial standby - - - - - - Performance standby 356 4,517 4,873 571 6,212 6,783 685 13,568 14,253 910 15,824 16,734 Non-borrower: Performance standby - 67 67 - 67 67 Total letters of credit $ 685 $ 13,635 $ 14,320 $ 910 $ 15,891 $ 16,801 Unused loan commitments: $ 88,883 $ 316,298 $ 405,181 $ 111,348 $ 320,120 $ 431,468
Schedule of aggregate minimum annual rental commitments	2026 2021 2022 2023 2024 2025 and there after Rental commitment $ 762 $ 625 $ 612 $ 628 $ 643 $ 3,297

Regulatory & Capital Matters (T

Regulatory & Capital Matters (Tables)	12 Months Ended
Regulatory & Capital Matters (Tables)	Dec. 31, 2020
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 2020 Common equity tier 1 capital to risk weighted assets Consolidated $ 277,199 11.94 $ 162,512 7.000 % N/A N/A Old Second Bank 318,466 13.75 162,128 7.000 $ 150,548 6.50 % Total capital to risk weighted assets Consolidated 331,178 14.26 243,855 10.500 N/A N/A Old Second Bank 347,408 15.00 243,186 10.500 231,605 10.00 Tier 1 capital to risk weighted assets Consolidated 302,199 13.01 197,440 8.500 N/A N/A Old Second Bank 318,466 13.75 196,870 8.500 185,289 8.00 Tier 1 capital to average assets Consolidated 302,199 10.21 118,393 4.00 N/A N/A Old Second Bank 318,466 10.74 118,609 4.00 148,262 5.00 2019 Common equity tier 1 capital to risk weighted assets Consolidated $ 251,477 11.14 % $ 158,020 7.000 % N/A N/A Old Second Bank 322,496 14.35 157,315 7.000 $ 146,078 6.50 % Total capital to risk weighted assets Consolidated 327,886 14.53 236,944 10.500 N/A N/A Old Second Bank 342,280 15.23 235,978 10.500 224,741 10.00 Tier 1 capital to risk weighted assets Consolidated 308,102 13.65 191,858 8.500 N/A N/A Old Second Bank 322,496 14.35 191,026 8.500 179,789 8.00 Tier 1 capital to average assets Consolidated 308,102 11.93 103,303 4.00 N/A N/A Old Second Bank 322,496 12.50 103,199 4.00 128,998 5.00 1 Amounts are shown inclusive of a capital conservation buffer of 2.50%. Under the Federal Reserve’s Small Bank Holding Company Policy Statement, the Company is not subject to the minimum capital adequacy and capital conservation buffer capital requirements at the holding company level, unless otherwise advised by the Federal Reserve (such capital requirements are applicable only at the Bank level). Although the minimum regulatory capital requirements are not applicable to the Company, we calculate these ratios for our own planning and monitoring purposes. 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
Mortgage Banking Derivatives (Tables)	Dec. 31, 2020
Not Designated as Hedging Instrument [Member] \| Mortgage Banking Derivatives
Mortgage Banking Derivatives
Schedule of the effect of fair value and cash flow hedge accounting	2020 2019 Forward contracts: Notional amount $ 46,500 $ 13,500 Fair value (228) (15) Rate lock commitments: Notional amount $ 37,972 $ 10,167 Fair value 1,068 265

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
Fair Value Measurements (Tables)	Dec. 31, 2020
Fair Value Measurements
Schedule of balance of assets and liabilities which are measured at fair value on a recurring basis	December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Securities available-for-sale U.S. Treasury $ 4,117 $ - $ - $ 4,117 U.S. government agencies - 6,657 - 6,657 U.S. government agencies mortgage-backed - 17,209 - 17,209 States and political subdivisions - 244,940 4,319 249,259 Collateralized mortgage obligations - 56,585 - 56,585 Asset-backed securities - 131,818 - 131,818 Collateralized loan obligations - 30,533 - 30,533 Loans held-for-sale - 12,611 - 12,611 Mortgage servicing rights - - 4,224 4,224 Interest rate swap agreements - 9,388 - 9,388 Mortgage banking derivatives - 840 - 840 Total $ 4,117 $ 510,581 $ 8,543 $ 523,241 Liabilities: Interest rate swap agreements, including risk participation agreements $ - $ 13,159 $ - $ 13,159 Total $ - $ 13,159 $ - $ 13,159 December 31, 2019 Level 1 Level 2 Level 3 Total Assets: Securities available-for-sale U.S. Treasury $ 4,036 $ - $ - $ 4,036 U.S. government agencies - 8,337 - 8,337 U.S. government agencies mortgage-backed - 16,588 - 16,588 States and political subdivisions - 243,756 5,419 249,175 Collateralized mortgage obligations - 57,984 - 57,984 Asset-backed securities - 81,844 - 81,844 Collateralized loan obligations - 66,684 - 66,684 Loans held-for-sale - 3,061 - 3,061 Mortgage servicing rights - - 5,935 5,935 Interest rate swap agreements - 2,771 - 2,771 Mortgage banking derivatives - 250 - 250 Total $ 4,036 $ 481,275 $ 11,354 $ 496,665 Liabilities: Interest rate swap agreements, including risk participation agreements $ - $ 5,974 $ - $ 5,974 Total $ - $ 5,974 $ - $ 5,974
Schedule of changes in Level 3 assets and liabilities measured at fair value on a recurring basis	Year Ended December 31, 2020 Securities available-for-sale States and Mortgage Political Servicing Subdivisions Rights Beginning balance January 1, 2020 $ 5,419 $ 5,935 Total gains or losses Included in earnings (20) (2,483) Included in other comprehensive income (628) - Purchases, issuances, sales, and settlements Purchases 13,086 - Issuances - 2,288 Settlements (13,538) (1,516) Ending balance December 31, 2020 $ 4,319 $ 4,224 Year Ended December 31, 2019 Securities available-for-sale States and Mortgage Political Servicing Subdivisions Rights Beginning balance January 1, 2019 $ 8,165 $ 7,357 Total gains or losses Included in earnings (32) (1,953) Included in other comprehensive income 726 - Purchases, issuances, sales, and settlements Purchases 17,938 - Issuances - 1,240 Settlements (21,378) (709) Ending balance December 31, 2019 $ 5,419 $ 5,935
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, 2020: Weighted Measured at fair value Unobservable Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs Mortgage servicing rights $ 4,224 Discounted Cash Flow Discount Rate 11.0 - 15.0% 11.0 % Prepayment Speed 5.5 - 59.1% 19.5 % The following table and commentary presents quantitative and qualitative information about Level 3 fair value measurements as of December 31, 2019: Weighted Measured at fair value Unobservable Average on a recurring basis: Fair Value Valuation Methodology Inputs Range of Input of Inputs Mortgage servicing rights $ 5,935 Discounted Cash Flow Discount Rate 10.0 - 58.8% 10.1 % Prepayment Speed 0.0 - 69.0% 14.1 %
Schedule of assets measured at fair value on a nonrecurring basis	December 31, 2020 Level 1 Level 2 Level 3 Total Individually evaluated loans 1 $ - $ - $ 9,675 $ 9,675 Other real estate owned, net 2 - - 2,474 2,474 Total $ - $ - $ 12,149 $ 12,149 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 $12.3 million and a valuation allowance of $2.6 million, resulting in an increase of specific allocations within the provision for credit losses of $1.4 million for the year ending December 31, 2020. 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $2.5 million, which is made up of the outstanding balance of $4.1 million, net of a valuation allowance of $1.6 million at December 31, 2020. December 31, 2019 Level 1 Level 2 Level 3 Total Impaired loans 1 $ - $ - $ 7,435 $ 7,435 Other real estate owned, net 2 - - 5,004 5,004 Total $ - $ - $ 12,439 $ 12,439 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 $8.6 million and a valuation allowance of $1.2 million, resulting in an increase of specific allocations within the provision for loan and lease losses of $783,000 for the year ending December 31, 2019. 2 OREO is measured at the lower of carrying or fair value less costs to sell, and had a net carrying amount of $5.0 million, which is made up of the outstanding balance of $12.6 million, net of a valuation allowance of $6.7 million and participations of $937,000 , at December 31, 2019.

Fair Values of Financial Inst_2

Fair Values of Financial Instruments (Tables)	12 Months Ended
Fair Values of Financial Instruments (Tables)	Dec. 31, 2020
Fair Values of Financial Instruments
Schedule of carrying amount and estimated fair values of financial instruments	December 31, 2020 Carrying Fair Amount Value Level 1 Level 2 Level 3 Financial assets: Cash and due from banks $ 24,306 $ 24,306 $ 24,306 $ - $ - Interest earning deposits with financial institutions 305,597 305,597 305,597 - - Securities available-for-sale 496,178 496,178 4,117 487,742 4,319 FHLBC and FRBC stock 9,917 9,917 - 9,917 - Loans held-for-sale 12,611 12,611 - 12,611 - Net loans 2,000,996 2,009,773 - - 2,009,773 Interest rate swap agreements 9,388 9,388 - 9,388 - Interest rate lock commitments and forward contracts 840 840 - 840 - Interest receivable on securities and loans 9,698 9,698 - 9,698 - Financial liabilities: Noninterest bearing deposits $ 909,505 $ 909,505 $ 909,505 $ - $ - Interest bearing deposits 1,627,568 1,630,109 - 1,630,109 - Securities sold under repurchase agreements 66,980 66,980 - 66,980 - Other short-term borrowings - - - - - Junior subordinated debentures 25,773 14,658 - 14,658 - Senior notes 44,375 44,600 44,600 - - Note payable and other borrowings 23,393 24,043 - 24,043 - Interest rate swap agreements 13,071 13,071 - 13,071 - Interest payable on deposits and borrowings 418 418 - 418 - December 31, 2019 Carrying Fair Amount Value Level 1 Level 2 Level 3 Financial assets: Cash and due from banks $ 34,096 $ 34,096 $ 34,096 $ - $ - Interest earning deposits with financial institutions 16,536 16,536 16,536 - - Securities available-for-sale 484,648 484,648 4,036 475,193 5,419 FHLBC and FRBC stock 9,917 9,917 - 9,917 - Loans held-for-sale 3,061 3,061 - 3,061 - Net loans 1,911,023 1,915,531 - - 1,915,531 Interest rate swap agreements 2,771 2,771 - 2,771 - Interest rate lock commitments and forward contracts 250 250 - 250 - Interest receivable on securities and loans 9,697 9,697 - 9,697 - Financial liabilities: Noninterest bearing deposits $ 669,795 $ 669,795 $ 669,795 $ - $ - Interest bearing deposits 1,456,954 1,457,832 - 1,457,832 - Securities sold under repurchase agreements 48,693 48,693 - 48,693 - Other short-term borrowings 48,500 48,500 - 48,500 - Junior subordinated debentures 57,734 51,188 33,614 17,574 - Senior notes 44,270 46,269 46,269 - - Note payable and other borrowings 6,673 7,003 - 7,003 - Interest rate swap agreements 5,921 5,921 - 5,921 - Interest payable on deposits and borrowings 1,079 1,079 - 1,079 -

Derivatives, Hedging Activiti_2

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2020
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Schedule of fair value of derivative financial instruments as well as their classification on the Balance Sheet	December 31, 2020 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 2,697 Other Liabilities 6,380 Total derivatives designated as hedging instruments 2,697 6,380 Derivatives not designated as hedging instruments Interest rate swaps with commercial loan customers 28 189,126 Other Assets 6,691 Other Liabilities 6,691 Interest rate lock commitments and forward contracts 205 84,472 Other Assets 840 Other Liabilities - Other contracts 4 26,523 Other Assets - Other Liabilities 88 Total derivatives not designated as hedging instruments 7,531 6,779 December 31, 2019 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 - Other Liabilities 3,150 Total derivatives designated as hedging instruments - 3,150 Derivatives not designated as hedging instruments Interest rate swaps with commercial loan customers 25 177,872 Other Assets 2,920 Other Liabilities 2,920 Interest rate lock commitments and forward contracts 87 23,667 Other Assets 250 Other Liabilities - Other contracts 4 28,176 Other Assets - Other Liabilities 53 Total derivatives not designated as hedging instruments 3,170 2,973

Parent Company Condensed Fina_2

Parent Company Condensed Financial Information (Tables)	12 Months Ended
Parent Company Condensed Financial Information (Tables)	Dec. 31, 2019
Parent Company Condensed Financial Information
Schedule of condensed balance sheets	2020 2019 Assets Noninterest bearing deposit with bank subsidiary $ 47,601 $ 26,562 Investment in subsidiaries 353,722 352,703 Other assets 3,270 3,981 Total assets $ 404,593 $ 383,246 Liabilities and Stockholders’ Equity Junior subordinated debentures $ 25,773 $ 57,734 Senior notes 44,375 44,270 Notes Payable 17,000 - Other liabilities 10,358 3,378 Stockholders’ equity 307,087 277,864 Total liabilities and stockholders' equity $ 404,593 $ 383,246
Schedule of condensed statements of operations	2020 2019 2018 Operating Income Cash dividends received from subsidiaries $ 41,300 $ 20,000 $ 30,000 Other income 32 109 106 Total operating income 41,332 20,109 30,106 Operating Expenses Junior subordinated debentures 2,216 3,724 3,716 Senior notes 2,693 2,700 2,688 Notes payable 362 - - Other interest expense - 13 98 Other expenses 3,669 4,025 4,208 Total operating expense 8,940 10,462 10,710 Income before income taxes and equity in undistributed net income of subsidiaries 32,392 9,647 19,396 Income tax benefit (2,215) (3,187) (3,355) Income before equity in undistributed net income of subsidiaries 34,607 12,834 22,751 Equity in undistributed net income of subsidiaries (6,782) 26,621 11,261 Net income available to common stockholders $ 27,825 $ 39,455 $ 34,012
Schedule of condensed statements of cash Flows	2020 2019 2018 Cash Flows from Operating Activities Net Income $ 27,825 $ 39,455 $ 34,012 Adjustments to reconcile net income to net cash from operating activities: Equity in undistributed net income of subsidiaries 6,782 (26,621) (11,261) Provision for deferred tax expense (benefit) (514) 4,186 6,697 Change in taxes payable 5,933 3,896 (1,211) Change in other assets 954 - 97 Stock-based compensation 2,089 2,516 2,257 Other, net 682 (80) 172 Net cash provided by (used in) operating activities 43,751 23,352 30,763 Cash Flows from Investing Activities Cash paid for acquisition, net of cash and cash equivalents retained - - (47,074) Net cash used in investing activities - - (47,074) Cash Flows from Financing Activities Net change in other short-term borrowings - (4,000) 4,000 Dividend paid on common stock (1,186) (1,195) (1,189) Purchases of treasury stock (5,922) (666) (505) Redemption of junior subordinated debentures (32,604) - - Issuance of term note 20,000 - - Repayment of term note (3,000) - - Proceeds from exercise of stock option - 32 33 Net cash (used in) provided by financing activities (22,712) (5,829) 2,339 Net change in cash and cash equivalents 21,039 17,523 (13,972) Cash and cash equivalents at beginning of year 26,562 9,039 23,011 Cash and cash equivalents at end of year $ 47,601 $ 26,562 $ 9,039

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details)	12 Months Ended
Summary of Significant Accounting Policies (Details)	Dec. 31, 2020USD ($)itemsegment	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Jan. 19, 2021$ / shares
Number of banking centres \| item	29
Operating segment \| segment	1
Reportable Segment \| segment	1
90-Days or Greater Past Due Loans
Period from due date after which accrual of interest income is discontinued	90 days
Goodwill and Core Deposit Intangible
Percentage of increase in share price	28.80%
Amortization of core deposit intangible	$ 494,000	$ 539,000	$ 387,000
Residential Owner Occupied Loan [Member]
Allowance for Credit Losses ("ACL")
Remaining life	6 years
Residential Investor Loan [Member]
Allowance for Credit Losses ("ACL")
Remaining life	4 years 6 months
Core Deposits [Member]
Goodwill and Core Deposit Intangible
Amortization of core deposit intangible	$ 494,000	$ 539,000	$ 387,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2021	459,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2022	421,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2023	379,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2024	331,000
Estimated future amortization expense for the core deposit intangible for the year ending December 31, 2025	$ 274,000
GCFC/ABC Bank \| Core Deposits [Member]
Goodwill and Core Deposit Intangible
Useful life (in years)	10 years
Remaining intangible asset	$ 2,200,000
Subsequent Event
Subsequent Events
Dividends Payable, Amount Per Share \| $ / shares				$ 0.01

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Premises and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Transfers and Servicing of Financial Assets
Mortgage loans serviced for others	$ 793.5	$ 723.4
Building [Member] \| Minimum [Member]
Premises and equipment
Useful lives	25 years
Building [Member] \| Maximum [Member]
Premises and equipment
Useful lives	40 years
Building Improvements [Member] \| Minimum [Member]
Premises and equipment
Useful lives	3 years
Building Improvements [Member] \| Maximum [Member]
Premises and equipment
Useful lives	15 years
Furniture and Fixtures [Member] \| Minimum [Member]
Premises and equipment
Useful lives	3 years
Furniture and Fixtures [Member] \| Maximum [Member]
Premises and equipment
Useful lives	10 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Accounting Pronouncement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Jan. 01, 2020
Retained earnings	$ 213,723	$ 236,579
Deferred tax assets	18,481	$ 18,972
Accounting Standards Update 2016-13 \| Revision of Prior Period, Adjustment [Member]
ACL on loans and leases	5,900
Reserve for unfunded commitments	1,700
ACL increase from non-accretable purchase accounting adjustments	$ 2,500
Retained earnings			$ 3,800
Deferred tax assets			$ 1,400

Cash and Due from Banks (Detail

Cash and Due from Banks (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Federal Reserve Bank Regulatory Reserve [Member]
Other disclosures
Balances	$ 0	$ 12,400,000

Securities - Investment Portfol

Securities - Investment Portfolio (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Securities
Pretax realized losses on sale of available-for-sale securities	$ 42	$ 1,010	$ 9
FHLB and FRB Stock
FHLBC stock	3,700
FRB stock	$ 6,200	$ 6,200

Securities - Amortized Cost and

Securities - Amortized Cost and Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Securities Available-for-Sale
Amortized Cost	$ 471,961	$ 475,146
Gross Unrealized Gains	26,735	13,285
Gross Unrealized Losses	(2,518)	(3,783)
Fair Value	496,178	484,648
Accrued interest receivable	2,700	3,200
Other disclosures
Purchases	65,229	159,544	$ 75,044
Sales	18,006	191,298	94,663
Securities pledged to secure deposits and for other purposes	335,800	$ 320,800	$ 320,800
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
US Treasury Securities [Member]
Securities Available-for-Sale
Amortized Cost	4,014	$ 4,010
Gross Unrealized Gains	103	26
Fair Value	4,117	4,036
US Treasury and Government
Securities Available-for-Sale
Amortized Cost	6,811
Gross Unrealized Losses	(154)
Fair Value	6,657
US Government Corporations and Agencies Securities [Member]
Securities Available-for-Sale
Amortized Cost		8,502
Gross Unrealized Losses		(165)
Fair Value		8,337
U.S. government agencies mortgage-backed
Securities Available-for-Sale
Amortized Cost	16,098	16,164
Gross Unrealized Gains	1,112	443
Gross Unrealized Losses	(1)	(19)
Fair Value	17,209	16,588
US States and Political Subdivisions Debt Securities [Member]
Securities Available-for-Sale
Amortized Cost	229,352	240,399
Gross Unrealized Gains	21,269	11,207
Gross Unrealized Losses	(1,362)	(2,431)
Fair Value	249,259	249,175
Collateralized Mortgage Obligations [Member]
Securities Available-for-Sale
Amortized Cost	53,999	57,059
Gross Unrealized Gains	2,866	963
Gross Unrealized Losses	(280)	(38)
Fair Value	56,585	57,984
Asset-backed Securities [Member]
Securities Available-for-Sale
Amortized Cost	130,959	82,114
Gross Unrealized Gains	1,370	617
Gross Unrealized Losses	(511)	(887)
Fair Value	131,818	81,844
FFEL
Securities Available-for-Sale
Fair Value	105,000	$ 105,000
Other disclosures
Percentage of outstanding principal amount of loans guaranteed by US Department of Education		97
Collateralized loan obligations
Securities Available-for-Sale
Amortized Cost	30,728	$ 66,898
Gross Unrealized Gains	15	29
Gross Unrealized Losses	(210)	(243)
Fair Value	30,533	$ 66,684
GCO Education Loan Funding Corp [Member] \| Stockholders' Equity, Total [Member]
Other disclosures
Credit risk as a percentage of benchmark		1.00%
Towd Point Mortgage Trust
Securities Available-for-Sale
Amortized Cost	33,198
Fair Value	$ 35,479

Securities - Contractural Matur

Securities - Contractural Maturities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Securities Available-for-Sale, Amortized Cost
Due in one year or less	$ 423
Due after one year through five years	5,833
Due after five years through ten years	27,802
Due after ten years	206,119
Debt securities excluding securities not due at a single maturity date	240,177
Total	$ 471,961	$ 475,146
Securities Available-for-Sale, Weighted Average Yield
Due in one year or less (as a percent)	2.09%
Due after one year through five years (as a percent)	2.11%
Due after five years through ten years (as a percent)	2.33%
Due after ten years (as a percent)	3.02%
Debt securities (as a percent)	2.92%
Total (as a percent)	2.44%
Securities Available-for-Sale, Fair Value
Due in one year or less	$ 427
Due after one year through five years	6,062
Due after five years through ten years	29,027
Due after ten years	224,517
Debt securities	260,033
Fair Value	496,178	484,648
Collateralized Mortgage Obligations [Member]
Securities Available-for-Sale, Amortized Cost
Total	53,999	57,059
Securities Available-for-Sale, Fair Value
Fair Value	56,585	57,984
Asset-backed Securities [Member]
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	130,959
Total	$ 130,959	82,114
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	1.37%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 131,818
Fair Value	131,818	81,844
Collateralized loan obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	30,728
Total	$ 30,728	66,898
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.04%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 30,533
Fair Value	30,533	$ 66,684
Mortgage-backed and collateralized mortgage obligations
Securities Available-for-Sale, Amortized Cost
Securities not due at a single maturity date	$ 70,097
Securities Available-for-Sale, Weighted Average Yield
Securities not due at a single maturity date, Weighted Average Yield (as a percent)	2.95%
Securities Available-for-Sale, Fair Value
Securities not due at a single maturity date	$ 73,794

Securities - Unrealized Loss Po

Securities - Unrealized Loss Positions (Details)	Dec. 31, 2020USD ($)security	Dec. 31, 2019USD ($)
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	7	19
Greater than 12 months in an unrealized loss position	13	15
Total	20	34
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 313,000	$ 2,602,000
Greater than 12 months in an unrealized loss position	2,205,000	1,181,000
Total	2,518,000	3,783,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	16,002,000	129,582,000
Greater than 12 months in an unrealized loss position	81,285,000	45,240,000
Total	$ 97,287,000	$ 174,822,000
US Government Corporations and Agencies Securities [Member]
Securities Available-for-Sale, Number of Securities
Greater than 12 months in an unrealized loss position	4	4
Total	4	4
Securities Available-for-Sale, Unrealized Losses
Greater than 12 months in an unrealized loss position	$ 154,000	$ 165,000
Total	154,000	165,000
Securities Available-for-Sale, Fair Value
Greater than 12 months in an unrealized loss position	6,657,000	8,337,000
Total	$ 6,657,000	$ 8,337,000
Mortgage Backed Securities, Issued by US Government Agencies [Member]
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	1	3
Greater than 12 months in an unrealized loss position		2
Total	1	5
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 1,000	$ 10,000
Greater than 12 months in an unrealized loss position		9,000
Total	1,000	19,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	141,000	3,018,000
Greater than 12 months in an unrealized loss position		843,000
Total	$ 141,000	$ 3,861,000
US States and Political Subdivisions Debt Securities [Member]
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position		6
Greater than 12 months in an unrealized loss position	1	2
Total	1	8
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position		$ 1,665,000
Greater than 12 months in an unrealized loss position	$ 1,362,000	766,000
Total	1,362,000	2,431,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position		41,043,000
Greater than 12 months in an unrealized loss position	3,433,000	6,593,000
Total	$ 3,433,000	$ 47,636,000
Collateralized Mortgage Obligations [Member]
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	4	2
Greater than 12 months in an unrealized loss position	1	2
Total	5	4
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 279,000	$ 26,000
Greater than 12 months in an unrealized loss position	1,000	12,000
Total	280,000	38,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	8,142,000	9,054,000
Greater than 12 months in an unrealized loss position	146,000	1,209,000
Total	$ 8,288,000	$ 10,263,000
Asset-backed Securities [Member]
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	1	4
Greater than 12 months in an unrealized loss position	3	1
Total	4	5
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 2,000	$ 839,000
Greater than 12 months in an unrealized loss position	509,000	48,000
Total	511,000	887,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	251,000	54,540,000
Greater than 12 months in an unrealized loss position	49,572,000	3,238,000
Total	$ 49,823,000	$ 57,778,000
Collateralized loan obligations
Securities Available-for-Sale, Number of Securities
Less than 12 months in an unrealized loss position	1	4
Greater than 12 months in an unrealized loss position	4	4
Total	5	8
Securities Available-for-Sale, Unrealized Losses
Less than 12 months in an unrealized loss position	$ 31,000	$ 62,000
Greater than 12 months in an unrealized loss position	179,000	181,000
Total	210,000	243,000
Securities Available-for-Sale, Fair Value
Less than 12 months in an unrealized loss position	7,468,000	21,927,000
Greater than 12 months in an unrealized loss position	21,477,000	25,020,000
Total	$ 28,945,000	$ 46,947,000

Securities - Realized Gain (Los

Securities - Realized Gain (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Securities
Sales	$ 18,006	$ 191,298	$ 94,663
Gross realized gains on securities	17	5,521	369
Gross realized losses on securities	(42)	(1,010)	(9)
Securities (losses) gains, net	(25)	4,511	360
Related tax (expense) benefit	$ 7	$ (1,267)	$ (100)
Effective tax rate applied (as a percent)	28.00%	28.10%	27.80%
Available-for-sale Securities Pledged as Collateral	$ 335,800	$ 320,800	$ 320,800

Loans and Allowance for Credi_3

Loans and Allowance for Credit Losses on Loans - Major Classifications (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 2,034,851	$ 1,920,425
Net deferred loan fees		1,786
Total loans, excluding PCI loans	2,034,851	1,922,211
Total Loans	2,034,851	1,930,812
Allowance for credit losses	(33,855)	(19,789)
Net loans	2,000,996	1,911,023
Loans and leases receivable, accrued interest receivable	7,000	6,500
Paycheck Protection Program (PPP)
Loans
Total Loans	74,100
PCI
Loans
Total Loans		8,601
Commercial
Loans
Total loans, excluding deferred loan costs and PCI loans	407,159	332,842
Total Loans	407,159	332,842
Leases
Loans
Total loans, excluding deferred loan costs and PCI loans	141,601	119,751
Total Loans	141,601	119,751
Commercial real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	582,042	520,095
Total Loans	582,042	520,095
Commercial real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	333,070	345,504
Total Loans	333,070	345,504
Construction
Loans
Total loans, excluding deferred loan costs and PCI loans	98,486	69,617
Total Loans	98,486	69,617
Real estate - Investor
Loans
Total loans, excluding deferred loan costs and PCI loans	56,137	71,105
Total Loans	56,137	71,105
Real estate - Owner occupied
Loans
Total loans, excluding deferred loan costs and PCI loans	116,388	136,023
Total Loans	116,388	136,023
Multifamily
Loans
Total loans, excluding deferred loan costs and PCI loans	189,040	189,773
Total Loans	189,040	189,773
HELOC
Loans
Total loans, excluding deferred loan costs and PCI loans	80,908	91,605
Total Loans	80,908	91,605
HELOC - Purchased
Loans
Total loans, excluding deferred loan costs and PCI loans	19,487	31,852
Total Loans	19,487	31,852
Other
Loans
Total loans, excluding deferred loan costs and PCI loans	$ 10,533	$ 12,258

Loans and Allowance for Credi_4

Loans and Allowance for Credit Losses on Loans - Major Classifications - Loan Concentrations (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Real Estate Portfolio Segment [Member] \| Loan receivables \| Customer Concentration Risk [Member]
Loans
Loans receivable as a percentage of total portfolio	72.50%	75.40%

Loans and Allowance for Credi_5

Loans and Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Allowance for loan losses:
Beginning Balance	$ 19,789	$ 19,006	$ 17,461
Provision (release)	9,166	1,600	1,228
Charge-offs	3,068	2,051	2,097
Recoveries	2,089	1,234	2,414
Ending Balance	33,855	19,789	19,006
Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	5,879
Commercial
Allowance for loan losses:
Beginning Balance	3,015	2,832	2,453
Provision (release)	72	218	263
Charge-offs	39	109	41
Recoveries	56	74	157
Ending Balance	2,812	3,015	2,832
Commercial \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	(292)
Leases
Allowance for loan losses:
Beginning Balance	1,262	734	692
Provision (release)	2,233	577	55
Charge-offs	206	49	13
Recoveries	98
Ending Balance	3,888	1,262	734
Leases \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	501
Commercial real estate - Investor
Allowance for loan losses:
Beginning Balance	6,218	6,339	5,020
Provision (release)	4,075	(497)	2,255
Charge-offs	512	303	1,376
Recoveries	165	679	440
Ending Balance	9,205	6,218	6,339
Commercial real estate - Investor \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	(741)
Commercial real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	3,678	3,515	3,157
Provision (release)	487	874	523
Charge-offs	1,763	716	172
Recoveries	697	5	7
Ending Balance	2,251	3,678	3,515
Commercial real estate - Owner occupied \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	(848)
Real estate - construction
Allowance for loan losses:
Beginning Balance	513	969	923
Provision (release)	2,095	(448)	(5)
Charge-offs	60	9	(16)
Recoveries	172	1	35
Ending Balance	4,054	513	969
Real estate - construction \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	1,334
Real estate - Investor
Allowance for loan losses:
Beginning Balance	601	554	542
Provision (release)	350	43	(110)
Charge-offs	8	7	(13)
Recoveries	57	11	109
Ending Balance	1,740	601	554
Real estate - Investor \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	740
Real estate - Owner occupied
Allowance for loan losses:
Beginning Balance	1,257	1,377	1,304
Provision (release)	(107)	(86)	(784)
Charge-offs	43	111	(10)
Recoveries	287	77	847
Ending Balance	2,714	1,257	1,377
Real estate - Owner occupied \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	1,320
Multifamily
Allowance for loan losses:
Beginning Balance	1,444	616	1,345
Provision (release)	449	813	(941)
Charge-offs			(22)
Recoveries		15	190
Ending Balance	3,625	1,444	616
Multifamily \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	1,732
HELOC
Allowance for loan losses:
Beginning Balance	1,161	1,449	1,446
Provision (release)	(1,198)	(351)	(214)
Charge-offs	127	109	147
Recoveries	387	172	364
Ending Balance	1,749	1,161	1,449
HELOC \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	1,526
HELOC - Purchased
Allowance for loan losses:
Provision (release)	265	229
Charge-offs	66	229
Ending Balance	199
Other
Allowance for loan losses:
Beginning Balance	640	621	579
Provision (release)	445	228	186
Charge-offs	244	409	409
Recoveries	170	200	265
Ending Balance	1,618	$ 640	$ 621
Other \| Accounting Standards Update 2016-13
Allowance for loan losses:
Ending Balance	$ 607

Loans and Allowance for Credi_6

Loans and Allowance for Credit Losses on Loans - Collateral dependent loans (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	$ 29,253
ACL Allocation	33,855	$ 19,789
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	25,150
Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,070
Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,377
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	656
Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	2,637
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,125
Commercial \| Accounts Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,070
Commercial \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	55
Commercial \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	56
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,974
Leases \| Equipment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	2,377
Leases \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	597
Leases \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	880
Commercial real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,179
Commercial real estate - Investor \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4,179
Commercial real estate - Investor \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	84
Commercial real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9,726
Commercial real estate - Owner occupied \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	9,726
Commercial real estate - Owner occupied \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	195
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,891
Construction \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,891
Construction \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	952
Real estate - Investor
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	928
Real estate - Investor \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	928
Real estate - Owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,535
Real estate - Owner occupied \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,535
Real estate - Owner occupied \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	10
Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,838
Multifamily \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	3,838
Multifamily \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	378
HELOC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,053
HELOC \| Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	1,053
HELOC \| Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL Allocation	78
Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4
Other \| Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans pledged as collateral	4
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, 2020USD ($)item	Dec. 31, 2019USD ($)
Aged analysis of past due loans
Current	$ 2,011,903
Nonaccrual	22,280	$ 15,395
Total loans, excluding PCI loans	2,034,851	1,922,211
Current including PCI Loans		1,898,221
Non accrual including PCI Loans		15,395
Total Past Due Including PCI loans	22,948	17,196
Total Loans	2,034,851	1,930,812
Total loans, including deferred loan loan costs and PCI	2,000,996	1,911,023
Recorded Investment 90 days or Greater Past Due and Accruing	$ 434	2,628
Total Loans		1,930,812
Number of loan modifications, CARES Act \| item	499
Number of loan modifications with deferral request, CARES Act \| item	51
Number of loan modifications resumed payments, CARES Act \| item	448
Pre-modification, CARES Act	$ 231,300
Post-modification, CARES Act	32,700
Loan modification CARES Act, resumed payments	198,600
30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due Including PCI loans	10,916	9,379
60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	1,840
Total Past Due Including PCI loans		5,272
90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	10,192
Total Past Due Including PCI loans		2,545
PCI
Aged analysis of past due loans
Total Past Due		261
Current		5,377
Nonaccrual		2,963
Total Loans		8,601
PCI \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		261
Non-PCI
Aged analysis of past due loans
Total Past Due		16,935
Current		1,892,844
Nonaccrual	22,280	12,432
Total loans, excluding PCI loans		1,922,211
Total Loans		1,922,211
Recorded Investment 90 days or Greater Past Due and Accruing		2,628
Non-PCI \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		9,118
Non-PCI \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		5,272
Non-PCI \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due		2,545
Commercial
Aged analysis of past due loans
Total Past Due	52	4,299
Current	407,107	328,399
Nonaccrual	1,125	144
Total Loans	407,159	332,842
Recorded Investment 90 days or Greater Past Due and Accruing		2,132
Commercial \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due		1,271
Commercial \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		925
Commercial \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	52	2,103
Leases
Aged analysis of past due loans
Total Past Due	988	443
Current	140,613	118,979
Nonaccrual	2,638	329
Total Loans	141,601	119,751
Recorded Investment 90 days or Greater Past Due and Accruing	163	128
Leases \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	613	362
Leases \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	59
Leases \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	316	81
Commercial real estate - Investor
Aged analysis of past due loans
Total Past Due	2,547	1,064
Current	579,495	517,336
Nonaccrual	1,632	1,695
Total Loans	582,042	520,095
Recorded Investment 90 days or Greater Past Due and Accruing		348
Commercial real estate - Investor \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,439	626
Commercial real estate - Investor \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due		95
Commercial real estate - Investor \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	1,108	343
Commercial real estate - Owner occupied
Aged analysis of past due loans
Total Past Due	10,115	3,495
Current	322,955	336,829
Nonaccrual	9,262	5,180
Total Loans	333,070	345,504
Commercial real estate - Owner occupied \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,848	2,469
Commercial real estate - Owner occupied \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	958	1,026
Commercial real estate - Owner occupied \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	7,309
Real estate - construction
Aged analysis of past due loans
Total Past Due	1,237	26
Current	97,249	69,498
Nonaccrual		93
Total Loans	98,486	69,617
Real estate - construction \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,237	26
Real estate - Investor
Aged analysis of past due loans
Total Past Due	1,526	266
Current	54,611	70,051
Nonaccrual	928	788
Total Loans	56,137	71,105
Recorded Investment 90 days or Greater Past Due and Accruing	157
Real estate - Investor \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	1,022	141
Real estate - Investor \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	20	125
Real estate - Investor \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	484
Real estate - Owner occupied
Aged analysis of past due loans
Total Past Due	1,862	4,801
Current	114,526	128,650
Nonaccrual	3,206	2,572
Total Loans	116,388	136,023
Recorded Investment 90 days or Greater Past Due and Accruing	114
Real estate - Owner occupied \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	859	3,450
Real estate - Owner occupied \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	286	1,351
Real estate - Owner occupied \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	717
Multifamily
Aged analysis of past due loans
Total Past Due	3,749	1,710
Current	185,291	187,995
Nonaccrual	2,437	68
Total Loans	189,040	189,773
Multifamily \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	3,282	10
Multifamily \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	467	1,700
HELOC
Aged analysis of past due loans
Total Past Due	805	803
Current	80,103	89,438
Nonaccrual	1,052	1,364
Total Loans	80,908	91,605
Recorded Investment 90 days or Greater Past Due and Accruing		20
HELOC \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	549	735
HELOC \| 60 to 89 Days Past Due
Aged analysis of past due loans
Total Past Due	50	50
HELOC \| 90 Days or Greater Past Due
Aged analysis of past due loans
Total Past Due	206	18
HELOC - Purchased
Aged analysis of past due loans
Total Past Due	47
Current	19,440	31,672
Nonaccrual		180
Total Loans	19,487	31,852
HELOC - Purchased \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	47
Other
Aged analysis of past due loans
Total Past Due	20	28
Current	10,513	13,997
Nonaccrual		19
Total Loans	10,533	14,044
Other \| 30 to 59 Days Past Due
Aged analysis of past due loans
Total Past Due	$ 20	28
Other 1
Aged analysis of past due loans
Nonaccrual		$ 19

Loans and Allowance for Credi_8

Loans and Allowance for Credit Losses on Loans - Loans In Active Deferral (Details) $ in Thousands	Dec. 31, 2020USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	$ 32,745
Loans modified under CARES Act, in nonaccrual, within deferral above	4,350
1st Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	9,431
Loans modified under CARES Act, in nonaccrual, within deferral above	999
2nd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	19,906
Loans modified under CARES Act, in nonaccrual, within deferral above	1,230
3rd Deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans modified under CARES Act, in deferral	3,408
Loans modified under CARES Act, in nonaccrual, within deferral above	$ 2,121

Loans and Allowance for Credi_9

Loans and Allowance for Credit Losses on Loans - Credit Quality (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans by risk rating
2020	$ 540,725,000
2019	426,334,000
2018	282,190,000
2017	192,546,000
2016	141,678,000
Prior	126,410,000
Revolving Loans	324,968,000
Total Loans	2,034,851,000	$ 1,930,812,000
Total loans, excluding PCI loans	2,034,851,000	1,922,211,000
Total Loans		1,930,812,000
Minimum [Member]
Loans by risk rating
Loan commitment for inclusion in credit quality analysis	50,000
Pass [Member]
Loans by risk rating
2020	527,373,000
2019	401,352,000
2018	270,306,000
2017	189,092,000
2016	139,283,000
Prior	115,951,000
Revolving Loans	322,913,000
Total Loans	1,966,270,000
Total Loans		1,863,146,000
Special Mention [Member]
Loans by risk rating
2020	8,341,000
2019	17,081,000
2018	288,000
2017	548,000
2016	98,000
Revolving Loans	170,000
Total Loans	26,526,000
Total Loans		26,886,000
Substandard [Member]
Loans by risk rating
2020	5,011,000
2019	7,901,000
2018	11,596,000
2017	2,906,000
2016	2,297,000
Prior	10,459,000
Revolving Loans	1,885,000
Total Loans	42,055,000
Total Loans		40,780,000
PCI
Loans by risk rating
Total Loans		8,601,000
PCI loans, net of purchase accounting adjustments		8,601,000
PCI \| Pass [Member]
Loans by risk rating
PCI loans, net of purchase accounting adjustments		573,000
PCI \| Special Mention [Member]
Loans by risk rating
PCI loans, net of purchase accounting adjustments		261,000
PCI \| Substandard [Member]
Loans by risk rating
PCI loans, net of purchase accounting adjustments		7,767,000
Non-PCI
Loans by risk rating
Total Loans		1,922,211,000
Total loans, excluding PCI loans		1,922,211,000
Non-PCI \| Pass [Member]
Loans by risk rating
Total loans, excluding PCI loans		1,862,573,000
Non-PCI \| Special Mention [Member]
Loans by risk rating
Total loans, excluding PCI loans		26,625,000
Non-PCI \| Substandard [Member]
Loans by risk rating
Total loans, excluding PCI loans		33,013,000
Commercial
Loans by risk rating
2020	107,199,000
2019	42,771,000
2018	16,111,000
2017	6,265,000
2016	1,828,000
Prior	1,691,000
Revolving Loans	231,294,000
Total Loans	407,159,000	332,842,000
Commercial \| Pass [Member]
Loans by risk rating
2020	101,796,000
2019	42,294,000
2018	14,519,000
2017	6,265,000
2016	1,825,000
Prior	1,691,000
Revolving Loans	230,388,000
Total Loans	398,778,000	307,948,000
Commercial \| Special Mention [Member]
Loans by risk rating
2020	5,130,000
2019	425,000
2018	68,000
2016	3,000
Revolving Loans	76,000
Total Loans	5,702,000	13,206,000
Commercial \| Substandard [Member]
Loans by risk rating
2020	273,000
2019	52,000
2018	1,524,000
Revolving Loans	830,000
Total Loans	2,679,000	11,688,000
Consumer
Loans by risk rating
Mortgage loans in process of foreclosure	546,000	831,000
Leases
Loans by risk rating
2020	56,780,000
2019	53,765,000
2018	17,628,000
2017	6,604,000
2016	5,692,000
Prior	1,132,000
Total Loans	141,601,000	119,751,000
Leases \| Pass [Member]
Loans by risk rating
2020	56,605,000
2019	52,168,000
2018	16,830,000
2017	6,545,000
2016	5,242,000
Prior	651,000
Total Loans	138,041,000	119,045,000
Leases \| Special Mention [Member]
Loans by risk rating
2020	175,000
2019	163,000
Total Loans	338,000	377,000
Leases \| Substandard [Member]
Loans by risk rating
2019	1,434,000
2018	798,000
2017	59,000
2016	450,000
Prior	481,000
Total Loans	3,222,000	329,000
Commercial real estate - Investor
Loans by risk rating
2020	178,884,000
2019	169,395,000
2018	92,447,000
2017	66,762,000
2016	56,398,000
Prior	16,837,000
Revolving Loans	1,319,000
Total Loans	582,042,000	520,095,000
Commercial real estate - Investor \| Pass [Member]
Loans by risk rating
2020	173,781,000
2019	158,677,000
2018	92,156,000
2017	66,762,000
2016	55,963,000
Prior	15,966,000
Revolving Loans	1,319,000
Total Loans	564,624,000	510,640,000
Commercial real estate - Investor \| Special Mention [Member]
Loans by risk rating
2020	2,394,000
2019	9,592,000
2018	220,000
2016	95,000
Total Loans	12,301,000	4,529,000
Commercial real estate - Investor \| Substandard [Member]
Loans by risk rating
2020	2,709,000
2019	1,126,000
2018	71,000
2016	340,000
Prior	871,000
Total Loans	5,117,000	4,926,000
Commercial real estate - Owner occupied
Loans by risk rating
2020	74,773,000
2019	54,963,000
2018	75,499,000
2017	46,979,000
2016	50,501,000
Prior	29,031,000
Revolving Loans	1,324,000
Total Loans	333,070,000	345,504,000
Commercial real estate - Owner occupied \| Pass [Member]
Loans by risk rating
2020	72,605,000
2019	52,809,000
2018	73,719,000
2017	45,315,000
2016	50,000,000
Prior	25,507,000
Revolving Loans	1,324,000
Total Loans	321,279,000	330,891,000
Commercial real estate - Owner occupied \| Special Mention [Member]
Loans by risk rating
2020	604,000
Total Loans	604,000	6,657,000
Commercial real estate - Owner occupied \| Substandard [Member]
Loans by risk rating
2020	1,564,000
2019	2,154,000
2018	1,780,000
2017	1,664,000
2016	501,000
Prior	3,524,000
Total Loans	11,187,000	7,956,000
Construction
Loans by risk rating
2020	50,208,000
2019	27,298,000
2018	9,260,000
2017	539,000
2016	218,000
Prior	1,261,000
Revolving Loans	9,702,000
Total Loans	98,486,000	69,617,000
Construction \| Pass [Member]
Loans by risk rating
2020	50,170,000
2019	24,163,000
2018	7,203,000
2017	539,000
2016	218,000
Prior	1,261,000
Revolving Loans	9,702,000
Total Loans	93,256,000	69,355,000
Construction \| Special Mention [Member]
Loans by risk rating
2020	38,000
Total Loans	38,000
Construction \| Substandard [Member]
Loans by risk rating
2019	3,135,000
2018	2,057,000
Total Loans	5,192,000	262,000
Real estate - Investor
Loans by risk rating
2020	9,720,000
2019	14,194,000
2018	9,132,000
2017	7,775,000
2016	2,522,000
Prior	11,650,000
Revolving Loans	1,144,000
Total Loans	56,137,000	71,105,000
Real estate - Investor \| Pass [Member]
Loans by risk rating
2020	9,371,000
2019	14,194,000
2018	8,522,000
2017	7,775,000
2016	2,431,000
Prior	11,184,000
Revolving Loans	1,144,000
Total Loans	54,621,000	69,715,000
Real estate - Investor \| Substandard [Member]
Loans by risk rating
2020	349,000
2018	610,000
2016	91,000
Prior	466,000
Total Loans	1,516,000	1,390,000
Real estate - Owner occupied
Loans by risk rating
2020	18,355,000
2019	23,450,000
2018	11,220,000
2017	15,628,000
2016	10,920,000
Prior	34,161,000
Revolving Loans	2,654,000
Total Loans	116,388,000	136,023,000
Real estate - Owner occupied \| Pass [Member]
Loans by risk rating
2020	18,308,000
2019	23,450,000
2018	10,808,000
2017	15,409,000
2016	10,394,000
Prior	31,325,000
Revolving Loans	2,654,000
Total Loans	112,348,000	132,258,000
Real estate - Owner occupied \| Special Mention [Member]
Loans by risk rating
Total Loans		134,000
Real estate - Owner occupied \| Substandard [Member]
Loans by risk rating
2020	47,000
2018	412,000
2017	219,000
2016	526,000
Prior	2,836,000
Total Loans	4,040,000	3,631,000
Multifamily
Loans by risk rating
2020	40,740,000
2019	37,750,000
2018	48,555,000
2017	39,608,000
2016	12,265,000
Prior	9,925,000
Revolving Loans	197,000
Total Loans	189,040,000	189,773,000
Multifamily \| Pass [Member]
Loans by risk rating
2020	40,671,000
2019	30,849,000
2018	44,301,000
2017	38,133,000
2016	12,147,000
Prior	7,735,000
Revolving Loans	197,000
Total Loans	174,033,000	187,560,000
Multifamily \| Special Mention [Member]
Loans by risk rating
2019	6,901,000
2017	548,000
Total Loans	7,449,000	1,710,000
Multifamily \| Substandard [Member]
Loans by risk rating
2020	69,000
2018	4,254,000
2017	927,000
2016	118,000
Prior	2,190,000
Total Loans	7,558,000	503,000
HELOC
Loans by risk rating
2020	2,511,000
2019	2,174,000
2018	1,765,000
2017	2,157,000
2016	775,000
Prior	894,000
Revolving Loans	70,632,000
Total Loans	80,908,000	91,605,000
HELOC \| Pass [Member]
Loans by risk rating
2020	2,511,000
2019	2,174,000
2018	1,679,000
2017	2,120,000
2016	504,000
Prior	803,000
Revolving Loans	69,483,000
Total Loans	79,274,000	89,804,000
HELOC \| Special Mention [Member]
Loans by risk rating
Revolving Loans	94,000
Total Loans	94,000	12,000
HELOC \| Substandard [Member]
Loans by risk rating
2018	86,000
2017	37,000
2016	271,000
Prior	91,000
Revolving Loans	1,055,000
Total Loans	1,540,000	1,789,000
HELOC - Purchased
Loans by risk rating
Prior	19,487,000
Total Loans	19,487,000	31,852,000
HELOC - Purchased \| Pass [Member]
Loans by risk rating
Prior	19,487,000
Total Loans	19,487,000	31,672,000
HELOC - Purchased \| Substandard [Member]
Loans by risk rating
Total Loans		180,000
Other
Loans by risk rating
2020	1,555,000
2019	574,000
2018	573,000
2017	229,000
2016	559,000
Prior	341,000
Revolving Loans	6,702,000
Total Loans	10,533,000	14,044,000
Other \| Pass [Member]
Loans by risk rating
2020	1,555,000
2019	574,000
2018	569,000
2017	229,000
2016	559,000
Prior	341,000
Revolving Loans	6,702,000
Total Loans	10,529,000	13,685,000
Other \| Substandard [Member]
Loans by risk rating
2018	4,000
Total Loans	$ 4,000	$ 359,000

Loans and Allowance for Cred_10

Loans and Allowance for Credit Losses on Loans - Nonaccruals (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	$ 22,280	$ 15,395
Non accrual including PCI Loans		15,395
Nonaccrual with no ACL	17,207	11,749
Interest on nonacccrual loans	70,000
Accrued interest reversed against interest income	377,000
Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,125	144
Nonaccrual with no ACL	1,070
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,638	329
Nonaccrual with no ACL	309	70
Commercial real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,632	1,695
Nonaccrual with no ACL	1,632	1,590
Commercial real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	9,262	5,180
Nonaccrual with no ACL	6,780	2,366
Real estate - construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		93
Nonaccrual with no ACL		93
Real estate - Investor
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	928	788
Nonaccrual with no ACL	928	788
Real estate - Owner occupied
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	3,206	2,572
Nonaccrual with no ACL	3,206	2,475
Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	2,437	68
Nonaccrual with no ACL	2,437	68
HELOC
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	1,052	1,364
Nonaccrual with no ACL	845	1,154
HELOC - Purchased
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		180
Nonaccrual with no ACL		180
Other 1
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		19
Nonaccrual with no ACL		2
Other
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		19
PCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual		2,963
Nonaccrual with no ACL		2,963
Non-PCI
Financing Receivable, Recorded Investment, Past Due [Line Items]
Nonaccrual	22,280	12,432
Nonaccrual with no ACL	$ 17,207	$ 8,786

Loans and Allowance for Cred_11

Loans and Allowance for Credit Losses on Loans - TDR (Details)	12 Months Ended
	Dec. 31, 2020USD ($)contract	Dec. 31, 2019USD ($)contract
Troubled debt restructurings - modified during the period
# of contracts \| contract	3	7
Pre-modification balance	$ 410,000	$ 2,076,000
Post-modification balance	395,000	1,949,000
Other information
Commitments to lend to borrowers whose loans were classified as impaired	0	$ 0
Financing receivable, purchase	0
Financing receivable, sales	$ 0
Residential Owner Occupied Loan [Member] \| Home Affordable Modification Program [Member]
Troubled debt restructurings - modified during the period
# of contracts \| contract	3	3
Pre-modification balance	$ 410,000	$ 399,000
Post-modification balance	395,000	$ 293,000
Commercial real estate - Investor \| Others [Member]
Troubled debt restructurings - modified during the period
# of contracts \| contract		2
Pre-modification balance		$ 1,217,000
Post-modification balance		$ 1,200,000
Commercial real estate - Owner occupied \| Deferral [Member]
Troubled debt restructurings - modified during the period
# of contracts \| contract		1
Pre-modification balance		$ 421,000
Post-modification balance		$ 418,000
HELOC \| Others [Member]
Troubled debt restructurings - modified during the period
# of contracts \| contract		1
Pre-modification balance		$ 39,000
Post-modification balance		38,000
TDR's defaulted
Pre-modification outstanding recorded investment during the period	$ 0	$ 39,000

Loans and Allowance for Cred_12

Loans and Allowance for Credit Losses on Loans - Related Parties (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Loans to principal officers, directors, and their affiliates
Beginning balance	$ 961	$ 1,417
New loans	644	634
Repayments and other reductions	(822)	(1,025)
Change in related party status		(65)
Ending balance	$ 783	$ 961

Other Real Estate Owned (Detail

Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
Other Real Estate Owned (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Activity in the other real estate owned (OREO) portfolio, net of valuation reserve
Balance at beginning of period	$ 5,004	$ 7,175	$ 8,371
Property additions	898	872	3,316
Property improvements			59
Less: Property disposals, net of gains/losses	3,071	2,515	3,990
Less: Period valuation adjustments	357	519	581
Less: Other adjustments		9
Balance at end of period	2,474	5,004	7,175
Activity in the valuation allowance
Balance at beginning of period	6,712	8,027	8,208
Provision for unrealized losses	357	519	581
Reductions taken on sales	(5,426)	(1,834)	(762)
Balance at end of period	1,643	6,712	8,027
Expenses related to foreclosed assets, net of lease revenue
Gain on sales, net	(204)	(264)	(792)
Provision for unrealized losses	357	519	581
Operating expenses	535	173	649
Less: Lease revenue	37	5	42
Expenses related to OREO, net of lease revenue	$ 651	$ 423	$ 396

Premises and Equipment (Details

Premises and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Premises and equipment
Cost	$ 115,865	$ 111,968
Accumulated Depreciation/Amortization	70,388	67,614
Net Book Value	45,477	44,354
Land [Member]
Premises and equipment
Cost	18,501	18,501
Net Book Value	18,501	18,501
Building [Member]
Premises and equipment
Cost	43,579	43,457
Accumulated Depreciation/Amortization	25,909	24,912
Net Book Value	17,670	18,545
Leasehold Improvements [Member]
Premises and equipment
Cost	2,324	2,314
Accumulated Depreciation/Amortization	699	399
Net Book Value	1,625	1,915
Furniture and Fixtures [Member]
Premises and equipment
Cost	51,461	47,696
Accumulated Depreciation/Amortization	43,780	42,303
Net Book Value	$ 7,681	$ 5,393

Deposits - Classifications of D

Deposits - Classifications of Deposits (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits
Noninterest bearing demand	$ 909,505	$ 669,795
Savings	399,057	307,015
NOW accounts	486,612	425,792
Money market accounts	316,465	282,478
Certificates of deposit of less than $100,000	200,107	227,578
Certificates of deposit of $100,000 up to $250,000	164,982	151,279
Certificates of deposit of $250,000 or more	60,345	62,812
Total deposits	$ 2,537,073	$ 2,126,749

Deposits - Scheduled maturities

Deposits - Scheduled maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deposits
Time	$ 425,434	$ 441,669
Noninterest bearing demand	909,505	669,795
Brokered certificates
Brokered certificates of deposit	59,100	31,400
Deposits held by senior officers and directors, including their related interests	2,300	2,900
Time Deposit Maturities
2021	349,003
2022	30,295
2023	18,308
2024	7,774
2025	20,054
Total	$ 425,434	$ 441,669

Borrowings - Summary (Details)

Borrowings - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Borrowings
Senior Notes	$ 44,375	$ 44,270
Total borrowings	160,521	205,870
Securities Sold under Agreements to Repurchase [Member]
Borrowings
Total borrowings	66,980	48,693
Federal Home Loan Bank Advances [Member]
Borrowings
Total borrowings		48,500
Junior Subordinated Debt
Borrowings
Total borrowings	25,773	57,734
Senior Notes.
Borrowings
Senior Notes	44,400	44,300
Total borrowings	44,375	44,270
Notes Payable to Banks [Member]
Borrowings
Total borrowings	$ 23,393	$ 6,673

Borrowings - Additional informa

Borrowings - Additional information (Details)	Dec. 31, 2020USD ($)item	Feb. 24, 2020USD ($)	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Borrowings
Threshold percentage of stockholders' equity			10.00%
Borrowings at FHLBC as percentage of total assets	35.00%		35.00%
FHLBC advance amount					$ 6,700,000
Bank owned FHLBC stock	$ 3,700,000		$ 3,700,000
Fair value of securities collateralized	54,700,000		54,700,000
Principal balance of loans collateralized	625,800,000		625,800,000
Maximum borrowing capacity				$ 459,500,000
Proceeds from term note	20,000,000	$ 20,000,000
Cash distribution rate of trust preferred securities (as a percent)		7.80%
Amount available for additional borrowings	336,900,000		336,900,000
Senior notes	44,375,000		44,375,000	44,270,000
Basis points added to reference rate (as a percent)		175.00%
Debt issuance costs				1,000	644,000
Total borrowings	160,521,000		160,521,000	$ 205,870,000
GCFC/ABC Bank
Borrowings
FHLBC advance amount	$ 6,400,000		$ 6,400,000
Debt Instrument, Term			5 years 3 months	6 years 3 months
Debt assumed					$ 23,400,000
GCFC/ABC Bank \| Maximum [Member]
Borrowings
Interest rate (as a percent)	2.83%		2.83%	2.83%
Securities Sold under Agreements to Repurchase [Member]
Borrowings
Carrying amount of securities secured	$ 67,000,000		$ 67,000,000	$ 48,700,000
Fair value of the pledged collateral	$ 94,400,000		$ 94,400,000	70,700,000
Number of customers having secured balances exceeding specified percentage of stockholders equity \| item	0		0
Total borrowings	$ 66,980,000		$ 66,980,000	48,693,000
Securities Sold under Agreements to Repurchase [Member] \| Minimum [Member]
Borrowings
Maturity			1 day
Securities Sold under Agreements to Repurchase [Member] \| Maximum [Member]
Borrowings
Maturity			90 days
Federal Home Loan Bank Advances [Member]
Borrowings
FHLBC advance amount	0		$ 0	48,500,000
Total borrowings				$ 48,500,000
FHLB advances at 1.44 %
Borrowings
Interest rate (as a percent)				1.78%
Notes Payable to Banks [Member]
Borrowings
Total borrowings	23,393,000		23,393,000	$ 6,673,000
Junior Subordinated Debt
Borrowings
Total borrowings	$ 25,773,000		$ 25,773,000	57,734,000
Senior Notes.
Borrowings
Interest rate (as a percent)	5.75%		5.75%
Senior notes	$ 44,400,000		$ 44,400,000	44,300,000
Debt Instrument, Term			10 years
Interest rate term			5 years
Debt issuance costs	625,000		$ 625,000	730,000
Amortization period for deferred financing costs			10 years
Total borrowings	44,375,000		$ 44,375,000	$ 44,270,000
Senior Notes. \| Debt Instrument, Variable Rate Base LIBOR [Member]
Borrowings
Basis points added to reference rate (as a percent)				385.00%
Term note
Borrowings
Proceeds from term note	$ 17,000,000	$ 20,000,000

Borrowings - Maturities and Wei

Borrowings - Maturities and Weighted Average Rates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Scheduled maturities and weighted average rates of borrowings
Year one	$ 70,980	$ 97,193
Year two	4,000
Year three	9,000
Thereafter	76,541	108,677
Total	$ 160,521	$ 205,870
Weighted Average Rate
Year one (as a percent)	0.46%	1.85%
Year two (as a percent)	1.91%
Year three (as a percent)	1.91%
Thereafter (as a percent)	5.24%	6.11%
Total (as a percent)	2.86%	4.10%

Junior Subordinated Debentures

Junior Subordinated Debentures - Issuance (Details)	Dec. 31, 2020USD ($)	Mar. 02, 2020USD ($)$ / shares	Feb. 24, 2020USD ($)	Apr. 30, 2007USD ($)	Jun. 15, 2017	Dec. 31, 2017	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)	Jun. 16, 2017
Junior subordinated debentures
Cash distribution rate of trust preferred securities (as a percent)			7.80%
Junior subordinated debentures	$ 25,773,000						$ 25,773,000	$ 57,734,000
Junior Subordinated Debentures issuance cost								1,000	$ 644,000
Cash disbursed for redemption		$ 33,000,000
Redemption price per share \| $ / shares		$ 10.13
Proceeds from term note	20,000,000		$ 20,000,000
Unamortized debt issuance costs		$ 635,000					$ 643,000	$ 48,000	$ 47,000
Old Second Capital Trust II [Member]
Junior subordinated debentures
Proceeds from sale of cumulative trust preferred securities				$ 25,000,000
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
Term note
Junior subordinated debentures
Proceeds from term note	$ 17,000,000		$ 20,000,000
Junior Subordinated Debt
Junior subordinated debentures
Interest Payment Deferment Period \| item								20
Junior Subordinated Debt \| Old Second Capital Trust I
Junior subordinated debentures
Cash distribution rate of trust preferred securities (as a percent)		7.80%
Junior subordinated debentures		$ 32,600,000
Amortization period		30 years
Junior Subordinated Debt \| Old Second Capital Trust II [Member]
Junior subordinated debentures
Interest rate (as a percent)	4.40%						4.40%	4.40%		2.80%
Junior subordinated debentures								$ 25,800,000
7.8% subordinated debentures
Junior subordinated debentures
Interest rate (as a percent)		7.80%

Income Taxes - Components (Deta

Income Taxes - Components (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of income tax expense (benefit)
Current federal	$ 6,269	$ 4,815
Current state	3,960	1,151	$ 84
Deferred federal	(135)	3,177	6,226
Deferred state	(511)	3,259	3,614
Total income tax expenses	9,583	12,402	$ 9,924
Deferred tax assets
Allowance for loan losses	11,058	6,082
Deferred compensation	1,093	907
Goodwill amortization/impairment	2,212	3,456
Stock based compensation	1,356	1,622
Business combination adjustments	255	1,547
OREO write downs	614	1,931
Federal net operating loss ("NOL") carryforward	142	340
State net operating loss ("NOL") carryforward	60	326
Other assets	2,182	2,270
Total deferred tax assets	18,972	18,481
Deferred tax liabilities
Accumulated depreciation on premises and equipment	(1,237)	(746)
Mortgage servicing rights	(1,261)	(1,779)
Amortization of core deposit intangible	(171)	(144)
State tax benefits	(930)	(927)
Other liabilities	(1,481)	(1,637)
Total deferred tax liabilities	(5,080)	(5,233)
Net deferred tax asset before valuation allowance	13,892	13,248
Tax effect of adjustments related to other comprehensive loss	(5,771)	(1,789)
Net deferred tax asset	$ 8,121	$ 11,459

Income Taxes - Carryforwards (D

Income Taxes - Carryforwards (Details)	Dec. 31, 2020USD ($)
Net operating loss carryforward
Built-in loss carryforward	$ 945,300
State \| 2025
Net operating loss carryforward
Net operating loss carryforward	$ 674,000

Income Taxes - Components of De

Income Taxes - Components of Deferred Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Components of the provision for deferred income taxes
Provision for loan losses	$ (4,976)	$ (279)	$ (426)
Deferred compensation	(186)	(242)	(15)
Amortization of core deposit intangible	27	14	957
Stock option compensation	266	(245)	(511)
Business combination adjustments	1,292	985	927
OREO write downs	1,317	406	48
Federal net operating loss carryforward	198	1,859	5,041
State net operating loss carryforward	266	3,708	2,986
Depreciation	491	303	59
Mortgage servicing rights	(518)	(431)	124
Goodwill amortization/impairment	1,244	1,242	1,389
State tax benefits	3	(912)	(550)
Other, net	(70)	28	(189)
Total deferred tax benefit	(646)	6,436	9,840
Difference between effective tax rates and federal statutory rates applied to financial statement income
Tax at statutory federal income tax rate	7,856	10,890	9,227
Nontaxable interest income, net of disallowed interest deduction	(1,067)	(1,409)	(1,600)
BOLI Income	(271)	(480)	(422)
State income taxes, net of federal benefit	2,570	3,496	2,927
Stock based compensation	297	(207)	(305)
Other, net	198	112	97
Total income tax expenses	9,583	12,402	9,924
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 37,408	$ 51,857	$ 43,936

Equity Compensation Plans - Opt

Equity Compensation Plans - Options (Details) - USD ($)	Dec. 31, 2009	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	May 31, 2019
2019 Plan
Equity Compensation Plans
Number of shares authorized					600,000
2009 Plan
Equity Compensation Plans
Granted (in shares)	16,500		0
Exercised (in shares)		0	4,500
Shares
Exercised (in shares)		0	(4,500)
Employee and Nonemployee Stock Options [Member]
Equity Compensation Plans
Total unrecognized compensation cost			$ 0
Aggregate Intrinsic Value
Exercised (in dollars)			$ (27,000)	$ (27,000)
Restricted Stock and Restricted Stock Units [Member]
Equity Compensation Plans
Vesting period		3 years

Equity Compensation Plans - Sum

Equity Compensation Plans - Summary of stock option activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Summary Of Stock Option Activity [Abstract]
Cash received from options exercised		$ 32	$ 33
Number of shares issuable	354,268
Stock based compensation	$ 2,089	2,516	2,257
Vesting Percentage , Fully Vest , Performace measure	50.00%
Minimum [Member]
Summary Of Stock Option Activity [Abstract]
Vesting Percentage , Fully Vest , Performace measure	50.00%
Maximum [Member]
Summary Of Stock Option Activity [Abstract]
Vesting Percentage , Pro rata , Performace measure	50.00%
Employee and Nonemployee Stock Options [Member]
Summary Of Stock Option Activity [Abstract]
Intrinsic value of options exercised		27	27
Cash received from options exercised		32	33
Tax benefit realized from option exercises		$ 5	$ 5

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, 2020	Dec. 31, 2019
Changes in unvested awards
Nonvested at the beginning of the period (in shares)	555,283
Granted (in shares)	140,944	171,356
Vested (in shares)	(149,952)
Forfeited (in shares)	(13,666)
Nonvested at the end of the period (in shares)	532,609	555,283
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 12.85
Granted (in dollars per share)	12.18
Vested (in dollars per share)	11.16
Forfeited (in dollars per share)	12.97
Nonvested at the end of the period (in dollars per share)	$ 13.15	$ 12.85
Additional information
Total unrecognized compensation cost of restricted awards	$ 2.1
Expected weighted-average period for recognition of unrecognized compensation	1 year 9 months

Earnings Per Share - Reconcilia

Earnings Per Share - Reconciliation (Details) - USD ($)	Jan. 16, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2018	Jan. 31, 2009
Basic earnings per share:
Weighted-average common shares outstanding		29,623,333	29,891,046	29,728,308
Net income		$ 27,825,000	$ 39,455,000	$ 34,012,000
Basic earnings per share (in dollars per share)		$ 0.94	$ 1.32	$ 1.14
Diluted earnings per share:
Weighted-average common shares outstanding		29,623,333	29,891,046	29,728,308
Diluted average common shares outstanding		30,174,072	30,416,348	30,308,935
Net earnings available to common stockholders		$ 27,825,000	$ 39,455,000	$ 34,012,000
Diluted earnings per share (in dollars per share)		$ 0.92	$ 1.30	$ 1.12
Warrants to purchase shares of common stock	815,339
Market price per share	$ 14.23
Number os shares issued	45,836
Reduction in additional paid up capital	$ 313,000
Warrant [Member]
Diluted earnings per share:
Antidilutive securities					815,339
Warrants, exercise price (in dollars per share)				$ 13.43	$ 13.43	$ 13.43
Restricted Stock and Restricted Stock Units [Member]
Diluted earnings per share:
Dilutive effect of share-based payment awards (in shares)		550,739	525,302	532,692
Employee and Nonemployee Stock Options [Member]
Diluted earnings per share:
Dilutive effect of share-based payment awards (in shares)				47,935

Commitments - Summary of Financ

Commitments - Summary of Financial Instrument Commitments (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fixed Letters of Credit [Member]
Financial instrument commitments
Financial instrument commitments	$ 685	$ 910
Fixed Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	685	910
Fixed Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	329	339
Fixed Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	356	571
Fixed Letters of Credit [Member] \| Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	88,883	111,348
Variable Letters of Credit [Member]
Financial instrument commitments
Financial instrument commitments	13,635	15,891
Variable Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	13,568	15,824
Variable Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	9,051	9,612
Variable Letters of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	4,517	6,212
Variable Letters of Credit [Member] \| Commitments to Extend Credit Nonborrowers [Member] \| Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	67	67
Variable Letters of Credit [Member] \| Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	316,298	320,120
Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	14,320	16,801
Letter of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member]
Financial instrument commitments
Financial instrument commitments	14,253	16,734
Letter of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Financial Standby Letter of Credit [Member]
Financial instrument commitments
Financial instrument commitments	9,380	9,951
Letter of Credit [Member] \| Commitments to Extend Credit to Borrowers [Member] \| Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	4,873	6,783
Letter of Credit [Member] \| Commitments to Extend Credit Nonborrowers [Member] \| Performance Guarantee [Member]
Financial instrument commitments
Financial instrument commitments	67	67
Letter of Credit [Member] \| Unused lines of Credit [Member]
Financial instrument commitments
Loan commitments	$ 405,181	$ 431,468

Commitments - Lease Commitments

Commitments - Lease Commitments and Legal Proceedings (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Estimated aggregate minimum annual rental commitments
2021	$ 762,000
2022	625,000
2023	612,000
2024	628,000
2025	643,000
2026	3,297,000
Aggregate future minimum rental income receivable under noncancelable leases	48,000
Total facility net operating lease revenue/expense	223,000	$ 248,000	$ 180,000
Total ATM lease expense	$ 1,000,000	$ 916,000	$ 979,000

Regulatory & Capital Matters (D

Regulatory & Capital Matters (Details) $ in Millions	12 Months Ended
Regulatory & Capital Matters (Details) $ in Millions	Dec. 31, 2020USD ($)	Dec. 31, 2019
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	10.21	11.93
Risk-based capital ratio (as a percent)	14.26	14.53
Phase out of impact of allowance for credit loss	$ 3.8
Deferment of impact on rretained earnings	5.7
Change in allowance for credit loss	$ 10.4
Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	10.74	12.50
Risk-based capital ratio (as a percent)	15	15.23
Minimum [Member] \| Subsidiaries [Member]
Regulatory & Capital Matters
Tier 1 capital leverage ratio (as a percent)	8
Risk-based capital ratio (as a percent)	12

Regulatory & Capital Matters -

Regulatory & Capital Matters - Capital Levels and Industry Defined Regulatory Minimums (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Common equity tier 1 capital to risk weighted assets
Actual	$ 277,199	$ 251,477
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 162,512	$ 158,020
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	11.94%	11.14%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Total capital to risk weighted assets, Amount
Actual at period end	$ 331,178	$ 327,886
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 243,855	$ 236,944
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	14.26	14.53
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.500	10.500
Tier 1 capital to risk weighted assets, Amount
Actual	$ 302,199	$ 308,102
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 197,440	$ 191,858
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	13.01	13.65
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.500	8.500
Tier 1 capital to average assets, Amount
Actual	$ 302,199	$ 308,102
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	$ 118,393	$ 103,303
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	10.21	11.93
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4	4
Subsidiaries [Member]
Common equity tier 1 capital to risk weighted assets
Actual	$ 318,466	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	162,128	157,315
Minimum Required to Be Well Capitalized	$ 150,548	$ 146,078
Common equity tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	13.75%	14.35%
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	7.00%	7.00%
Minimum Required to Be Well Capitalized (as a percent)	6.50%	6.50%
Total capital to risk weighted assets, Amount
Actual at period end	$ 347,408	$ 342,280
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	243,186	235,978
Minimum Required to Be Well Capitalized	$ 231,605	$ 224,741
Total capital to risk weighted assets, Ratio
Risk-based capital ratio (as a percent)	15	15.23
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	10.500	10.500
Minimum Required to Be Well Capitalized (as a percent)	10	10
Tier 1 capital to risk weighted assets, Amount
Actual	$ 318,466	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	196,870	191,026
Minimum Required to Be Well Capitalized	$ 185,289	$ 179,789
Tier 1 capital to risk weighted assets, Ratio
Actual (as a percent)	13.75	14.35
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	8.500	8.500
Minimum Required to Be Well Capitalized (as a percent)	8	8
Tier 1 capital to average assets, Amount
Actual	$ 318,466	$ 322,496
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable	118,609	103,199
Minimum Required to Be Well Capitalized	$ 148,262	$ 128,998
Tier 1 capital to average assets, Ratio
Tier 1 capital leverage ratio (as a percent)	10.74	12.50
Minimum Required for Capital Adequacy Purposes with Capital Conservation Buffer if applicable (as a percent)	4	4
Minimum Required to Be Well Capitalized (as a percent)	5	5

Regulatory & Capital Matters _2

Regulatory & Capital Matters - Dividend Restrictions and Deferrals (Details)	12 Months Ended
	Dec. 31, 2020
Dividend Restrictions and Deferrals
Number of previous years retained profit considered for dividend payment	2 years
Minimum capital requirements, minimum percentage required	2.50%

Mortgage Banking Derivatives (D

Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 384,400
Proceeds from sale of loan to investors	388,538	$ 168,472	$ 137,622
Gain on sale of loan	15,519	5,112	$ 3,791
Federal National Mortgage Association [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 312,000
Federal National Mortgage Association [Member] \| Customer Concentration Risk [Member]
Mortgage Banking Derivatives
Percentage of concentration risk	83.20%
Federal Home Loan Mortgage Corporation [Member]
Mortgage Banking Derivatives
Amount of loans sold to investors	$ 44,200
Federal Home Loan Mortgage Corporation [Member] \| Customer Concentration Risk [Member]
Mortgage Banking Derivatives
Percentage of concentration risk	11.80%
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	$ 46,500	13,500
Fair value	(228)	(15)
Not Designated as Hedging Instrument [Member] \| Interest Rate Lock Commitments [Member]
Mortgage Banking Derivatives
Notional or Contractual Amount	37,972	10,167
Fair value	$ 1,068	$ 265

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($)	12 Months Ended
Fair Value Measurements (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Fair Value Measurements
Fair value transfer assets , level 1 to level 2	$ 0
Fair value transfer assets , level 2 to level 1	0	$ 0
Fair value transfer liabilitiess , level 1 to level 2	0	0
Fair value transfer liabilities , level 2 to level 1	0	0
Fair value transfer assets into level 3	0	0
Fair value transfer assets out of level 3	0	0
Fair value transfer liabilities into level 3	0	0
Fair value transfer liabilities out of level 3	$ 0	$ 0

Fair Value Measurements - Recur

Fair Value Measurements - Recurring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Assets:
Securities available-for-sale	$ 496,178	$ 484,648
Mortgage servicing rights	4,224	5,935
US Treasury Securities [Member]
Assets:
Securities available-for-sale	4,117	4,036
US Government Corporations and Agencies Securities [Member]
Assets:
Securities available-for-sale		8,337
US States and Political Subdivisions Debt Securities [Member]
Assets and liabilities measured at fair value on a recurring basis
Purchases	13,086	17,938
Assets:
Securities available-for-sale	249,259	249,175
Collateralized Mortgage Obligations [Member]
Assets:
Securities available-for-sale	56,585	57,984
Asset-backed Securities [Member]
Assets:
Securities available-for-sale	131,818	81,844
Collateralized loan obligations
Assets:
Securities available-for-sale	30,533	66,684
Fair Value, Inputs, Level 1 [Member]
Assets:
Securities available-for-sale	4,117	4,036
Fair Value, Inputs, Level 2 [Member]
Assets:
Securities available-for-sale	487,742	475,193
Loans held-for-sale	12,611	3,061
Other assets	9,388	2,771
Liabilities:
Other liabilities	13,071	5,921
Fair Value, Inputs, Level 3 [Member]
Assets:
Securities available-for-sale	4,319	5,419
Recurring
Assets:
Loans held-for-sale	12,611	3,061
Mortgage servicing rights	4,224	5,935
Total financial assets	523,241	496,665
Liabilities:
Total	13,159	5,974
Recurring \| Interest Rate Swap [Member]
Assets:
Other assets	9,388	2,771
Liabilities:
Other liabilities	13,159	5,974
Recurring \| Forward Contracts [Member]
Assets:
Other assets	840	250
Recurring \| US Treasury Securities [Member]
Assets:
Securities available-for-sale	4,117	4,036
Recurring \| US Government Corporations and Agencies Securities [Member]
Assets:
Securities available-for-sale	6,657	8,337
Recurring \| Mortgage Backed Securities, Issued by US Government Agencies [Member]
Assets:
Securities available-for-sale	17,209	16,588
Recurring \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Securities available-for-sale	249,259	249,175
Recurring \| Collateralized Mortgage Obligations [Member]
Assets:
Securities available-for-sale	56,585	57,984
Recurring \| Asset-backed Securities [Member]
Assets:
Securities available-for-sale	131,818	81,844
Recurring \| Collateralized loan obligations
Assets:
Securities available-for-sale	30,533	66,684
Recurring \| Fair Value, Inputs, Level 1 [Member]
Assets:
Total financial assets	4,117	4,036
Recurring \| Fair Value, Inputs, Level 1 [Member] \| US Treasury Securities [Member]
Assets:
Securities available-for-sale	4,117	4,036
Recurring \| Fair Value, Inputs, Level 2 [Member]
Assets:
Loans held-for-sale	12,611	3,061
Total financial assets	510,581	481,275
Liabilities:
Total	13,159	5,974
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Interest Rate Swap [Member]
Assets:
Other assets	9,388	2,771
Liabilities:
Other liabilities	13,159	5,974
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Forward Contracts [Member]
Assets:
Other assets	840	250
Recurring \| Fair Value, Inputs, Level 2 [Member] \| US Government Corporations and Agencies Securities [Member]
Assets:
Securities available-for-sale	6,657	8,337
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Mortgage Backed Securities, Issued by US Government Agencies [Member]
Assets:
Securities available-for-sale	17,209	16,588
Recurring \| Fair Value, Inputs, Level 2 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Securities available-for-sale	244,940	243,756
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Collateralized Mortgage Obligations [Member]
Assets:
Securities available-for-sale	56,585	57,984
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Asset-backed Securities [Member]
Assets:
Securities available-for-sale	131,818	81,844
Recurring \| Fair Value, Inputs, Level 2 [Member] \| Collateralized loan obligations
Assets:
Securities available-for-sale	30,533	66,684
Recurring \| Fair Value, Inputs, Level 3 [Member]
Assets:
Mortgage servicing rights	4,224	5,935
Total financial assets	8,543	11,354
Recurring \| Fair Value, Inputs, Level 3 [Member] \| US States and Political Subdivisions Debt Securities [Member]
Assets:
Securities available-for-sale	$ 4,319	$ 5,419

Fair Value Measurements - Chang

Fair Value Measurements - Changes in Level 3 (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Changes in Level 3
Transfers into Level 3	$ 0	$ 0
Transfers out of Level 3	0	0
US States and Political Subdivisions Debt Securities [Member]
Changes in Level 3
Beginning balance	5,419,000	8,165,000
Total gains or losses
Included in earnings (or changes in net assets)	(20,000)	(32,000)
Included in other comprehensive income	(628,000)	726,000
Purchases, issuances, sales, and settlements
Purchases	13,086,000	17,938,000
Settlements	(13,538,000)	(21,378,000)
Ending balance	4,319,000	5,419,000
Mortgage Servicing Rights [Member]
Changes in Level 3
Beginning balance	5,935,000	7,357,000
Total gains or losses
Included in earnings (or changes in net assets)	(2,483,000)	(1,953,000)
Purchases, issuances, sales, and settlements
Issuances	2,288,000	1,240,000
Settlements	(1,516,000)	(709,000)
Ending balance	$ 4,224,000	$ 5,935,000

Fair Value Measurements - Quant

Fair Value Measurements - Quantitative and Qualitative Information (Details)	Dec. 31, 2020USD ($)	Dec. 31, 2019USD ($)
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 4,224,000	$ 5,935,000
Securities available-for-sale, at fair value	496,178,000	484,648,000
Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	4,319,000	5,419,000
US States and Political Subdivisions Debt Securities [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	249,259,000	249,175,000
US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	4,300,000	5,400,000
Collateralized Mortgage Obligations [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	56,585,000	57,984,000
Recurring
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	4,224,000	5,935,000
Recurring \| Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	4,224,000	5,935,000
Recurring \| US States and Political Subdivisions Debt Securities [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	249,259,000	249,175,000
Recurring \| US States and Political Subdivisions Debt Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	4,319,000	5,419,000
Recurring \| Collateralized Mortgage Obligations [Member]
Quantitative information about Level 3 fair value measurements
Securities available-for-sale, at fair value	56,585,000	57,984,000
Recurring \| Measurement Input, Discount Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member]
Quantitative information about Level 3 fair value measurements
Mortgage servicing rights, fair value	$ 4,224,000	$ 5,935,000
Recurring \| Measurement Input, Discount Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Minimum [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11	10
Recurring \| Measurement Input, Discount Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Maximum [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	15	58.8
Recurring \| Measurement Input, Discount Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	11	10.1
Recurring \| Measurement Input, Constant Prepayment Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Minimum [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	5.5	0
Recurring \| Measurement Input, Constant Prepayment Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Maximum [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	59.1	69
Recurring \| Measurement Input, Constant Prepayment Rate \| Mortgage Servicing Rights [Member] \| Discounted Cash Flow \| Fair Value, Inputs, Level 3 [Member] \| Weighted Average [Member]
Quantitative information about Level 3 fair value measurements
Servicing Asset, Measurement Input	19.5	14.1

Fair Value Measurements - Nonre

Fair Value Measurements - Nonrecurring (Details) - USD ($)	12 Months Ended
Fair Value Measurements - Nonrecurring (Details) - USD ($)	Dec. 31, 2020	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2017
Assets and liabilities measured at fair value
Valuation allowance	$ 2,600,000		$ 1,200,000
Valuation allowance		$ 8,600,000
Carrying value of other real estate owned	2,474,000	7,175,000	5,004,000	$ 8,371,000
OREO Valuation allowance	1,643,000	8,027,000	6,712,000	$ 8,208,000
Fair Value, Measurements, Nonrecurring [Member]
Assets and liabilities measured at fair value
Total	12,149,000		12,439,000
Fair Value, Measurements, Nonrecurring [Member] \| Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	9,675,000		7,435,000
Valuation allowance	12,300,000
Increase (decrease) of specific allocations within the provision for loan losses	1,400,000	(783,000)
Fair Value, Measurements, Nonrecurring [Member] \| Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	2,474,000		5,004,000
Carrying value of other real estate owned	2,500,000	5,000,000
Outstanding balance	4,100,000	12,600,000
OREO Valuation allowance	1,600,000	6,700,000
OREO participations		$ 937,000
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Assets and liabilities measured at fair value
Total	12,149,000		12,439,000
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Impaired Loans [Member]
Assets and liabilities measured at fair value
Total	9,675,000		7,435,000
Fair Value, Measurements, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member] \| Other Real Estate Owned [Member]
Assets and liabilities measured at fair value
Total	$ 2,474,000		$ 5,004,000

Fair Values of Financial Inst_3

Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Fair Values of Financial Instruments
Proceeds from sales of FHLBC/FRBC stock	$ 6,875	$ 6,754
Financial assets:
Cash and due from banks	34,096		$ 24,306
Interest bearing deposits with financial institutions	16,536		305,597
Securities available-for-sale	484,648		496,178
FHLBC and FRBC Stock	9,917		9,917
Bank-owned life insurance	61,763		63,102
Financial liabilities:
Noninterest bearing deposits	669,795		909,505
Other short-term borrowings	48,500
Junior subordinated debentures	57,734		25,773
Reported Value Measurement [Member]
Financial assets:
Cash and due from banks	34,096		24,306
Interest bearing deposits with financial institutions	16,536		305,597
Securities available-for-sale	484,648		496,178
FHLBC and FRBC Stock	9,917		9,917
Loans held for sale	3,061		12,611
Net loans	1,911,023		2,000,996
Interest rate swap agreements	2,771		9,388
Interest rate lock commitments and forward contracts	250		840
Interest receivable on securities and loans	9,697		9,698
Financial liabilities:
Noninterest bearing deposits	669,795		909,505
Interest bearing deposits	1,456,954		1,627,568
Securities sold under repurchase agreements	48,693		66,980
Other short-term borrowings	48,500
Junior subordinated debentures	57,734		25,773
Senior notes	44,270		44,375
Note payable and other borrowings	6,673		23,393
Interest rate swap agreements	5,921		13,071
Interest payable on deposits and borrowings	1,079		418
Estimate of Fair Value Measurement [Member]
Financial assets:
Cash and due from banks	34,096		24,306
Interest bearing deposits with financial institutions	16,536		305,597
Securities available-for-sale	484,648		496,178
FHLBC and FRBC Stock	9,917		9,917
Loans held for sale	3,061		12,611
Net loans	1,915,531		2,009,773
Interest rate swap agreements	2,771		9,388
Interest rate lock commitments and forward contracts	250		840
Interest receivable on securities and loans	9,697		9,698
Financial liabilities:
Noninterest bearing deposits	669,795		909,505
Interest bearing deposits	1,457,832		1,630,109
Securities sold under repurchase agreements	48,693		66,980
Other short-term borrowings	48,500
Junior subordinated debentures	51,188		14,658
Senior notes	46,269		44,600
Note payable and other borrowings	7,003		24,043
Interest rate swap agreements	5,921		13,071
Interest payable on deposits and borrowings	1,079		418
Fair Value, Inputs, Level 1 [Member]
Financial assets:
Cash and due from banks	34,096		24,306
Interest bearing deposits with financial institutions	16,536		305,597
Securities available-for-sale	4,036		4,117
Financial liabilities:
Noninterest bearing deposits	669,795		909,505
Junior subordinated debentures	33,614
Senior notes	46,269		44,600
Fair Value, Inputs, Level 2 [Member]
Financial assets:
Securities available-for-sale	475,193		487,742
FHLBC and FRBC Stock	9,917		9,917
Loans held for sale	3,061		12,611
Interest rate swap agreements	2,771		9,388
Interest rate lock commitments and forward contracts	250		840
Interest receivable on securities and loans	9,697		9,698
Financial liabilities:
Interest bearing deposits	1,457,832		1,630,109
Securities sold under repurchase agreements	48,693		66,980
Other short-term borrowings	48,500
Junior subordinated debentures	17,574		14,658
Note payable and other borrowings	7,003		24,043
Interest rate swap agreements	5,921		13,071
Interest payable on deposits and borrowings	1,079		418
Fair Value, Inputs, Level 3 [Member]
Financial assets:
Securities available-for-sale	5,419		4,319
Net loans	$ 1,915,531		$ 2,009,773

Derivatives, Hedging Activiti_3

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Fair Value of Derivatives (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2019USD ($)item	Dec. 31, 2020USD ($)item	Dec. 31, 2019USD ($)item	Dec. 31, 2018USD ($)
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Loan pool hedge	$ 50,000,000		$ 50,000,000
Term of interest rate risk cash flow hedge	5 years
Interest Rate Swap [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Notional Amount	$ 25,800,000	$ 25,800,000	25,800,000
Designated as Hedging Instrument [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative assets designated as hedging instruments, fair value		2,697,000
Derivative liabilities designated as hedging instruments, fair value	$ 3,150,000	$ 6,380,000	$ 3,150,000
Designated as Hedging Instrument [Member] \| Interest Rate Products \| OSBC Affiliates
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative, number of transactions \| item	2	2	2
Notional Amount	$ 75,774,000	$ 75,774,000	$ 75,774,000
Derivative assets designated as hedging instruments, fair value		2,697,000
Derivative liabilities designated as hedging instruments, fair value	3,150,000	6,380,000	3,150,000
Not Designated as Hedging Instrument [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative assets designated as hedging instruments, fair value	3,170,000	7,531,000	3,170,000
Derivative liabilities designated as hedging instruments, fair value	$ 2,973,000	$ 6,779,000	$ 2,973,000
Not Designated as Hedging Instrument [Member] \| Interest Rate Products \| Commercial Loan Customers
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative, number of transactions \| item	25	28	25
Notional Amount	$ 177,872,000	$ 189,126,000	$ 177,872,000
Derivative assets designated as hedging instruments, fair value	2,920,000	6,691,000	2,920,000
Derivative liabilities designated as hedging instruments, fair value	2,920,000	$ 6,691,000	$ 2,920,000
Weighted average maturity		4 years 8 months 12 days	5 years 10 months 24 days
Not Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Notional Amount	177,900,000		$ 177,900,000
Cash collateral pledged with financial institutions, dollars	114,000	$ 17,200,000	114,000
Investment securities pledged with financial institutions, dollars	$ 11,000,000	$ 0	$ 11,000,000
Number of correspondent financial institutions where investment securities are pledged		1		1
Not Designated as Hedging Instrument [Member] \| Interest Rate Lock Commitments and Forward Contracts
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative, number of transactions \| item	87	205	87
Notional Amount	$ 23,667,000	$ 84,472,000	$ 23,667,000
Derivative assets designated as hedging instruments, fair value	$ 250,000	$ 840,000	$ 250,000
Not Designated as Hedging Instrument [Member] \| Other Contracts
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Derivative, number of transactions \| item	4	4	4
Notional Amount	$ 28,176,000	$ 26,523,000	$ 28,176,000
Derivative liabilities designated as hedging instruments, fair value	53,000	88,000	53,000
Not Designated as Hedging Instrument [Member] \| Forward Contracts [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Notional Amount	13,500,000	$ 46,500,000	13,500,000
Interest Income [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Amount to be reclassified as a reduction to interest expense during the next twelve months	182,000		182,000
Interest Expense [Member]
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Amount to be reclassified as a reduction to interest expense during the next twelve months	$ 167,000		$ 167,000

Derivatives, Hedging Activiti_4

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Effect of Fair Value (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk
Amount of Gain or (Loss) Reclassified from Accumulated OCI into Income	$ 2,700,000	$ 2,300,000
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 57,000	$ 50,000

Derivatives, Hedging Activiti_5

Derivatives, Hedging Activities and Financial Instruments with Off-Balance Sheet Risk - Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2020
Fixed Letters of Credit [Member] \| Unused lines of Credit [Member]
Company's contractual commitments due to letters of credit
Loan commitments	$ 111,348	$ 88,883
Variable Letters of Credit [Member] \| Unused lines of Credit [Member]
Company's contractual commitments due to letters of credit
Loan commitments	320,120	316,298
Letter of Credit [Member] \| Unused lines of Credit [Member]
Company's contractual commitments due to letters of credit
Loan commitments	431,468	$ 405,181
Revision of Prior Period, Adjustment [Member] \| Accounting Standards Update 2016-13
Company's contractual commitments due to letters of credit
Provision for Unfunded Commitments	$ 1,700

Preferred Stock (Details)

Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2020	Jan. 16, 2019	Dec. 31, 2009	Mar. 31, 2009
Preferred Stock
Warrants to purchase the Company's common stock, initially authorized (in shares)					815,339
Preferred stock, Shares authorized				300,000
Series B Preferred Stock [Member]
Preferred Stock
Fair value							$ 68.2
Shares redeemed (in shares)		73,000	73,000
Warrant [Member]
Preferred Stock
Warrants, term	10 years
Warrants to purchase the Company's common stock, initially authorized (in shares)						815,339
Warrants, exercise price (in dollars per share)	$ 13.43
Fair value							$ 4.8

Parent Company Condensed Fina_3

Parent Company Condensed Financial Information - Condensed Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Other assets	$ 47,053	$ 26,474
Total assets	3,040,837	2,635,545
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	57,734
Senior notes	44,375	44,270
Other liabilities	36,156	25,062
Stockholders' equity	307,087	277,864	$ 229,081	$ 200,350
Total liabilities and stockholders' equity	3,040,837	2,635,545
Parent Company [Member]
Assets
Noninterest bearing deposit with bank subsidiary	47,601	26,562
Investment in subsidiaries	353,722	352,703
Other assets	3,270	3,981
Total assets	404,593	383,246
Liabilities and Stockholders' Equity
Junior subordinated debentures	25,773	57,734
Senior notes	44,375	44,270
Notes Payable	17,000
Other liabilities	10,358	3,378
Stockholders' equity	307,087	277,864
Total liabilities and stockholders' equity	$ 404,593	$ 383,246

Parent Company Condensed Fina_4

Parent Company Condensed Financial Information - Condensed Statements of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Expenses
Junior subordinated debentures	$ 2,215	$ 3,724	$ 3,716
Senior notes	2,692	2,699	2,688
Income before income taxes and equity in undistributed net income of subsidiaries	37,408	51,857	43,936
Income tax benefit	9,583	12,402	9,924
Net income available to common stockholders	27,825	39,455	34,012
Parent Company [Member]
Operating Income
Cash dividends received from subsidiaries	41,300	20,000	30,000
Other income	32	109	106
Total operating income	41,332	20,109	30,106
Operating Expenses
Junior subordinated debentures	2,216	3,724	3,716
Senior notes	2,693	2,700	2,688
Notes payable	362
Other interest expense		13	98
Other expenses	3,669	4,025	4,208
Total operating expense	8,940	10,462	10,710
Income before income taxes and equity in undistributed net income of subsidiaries	32,392	9,647	19,396
Income tax benefit	(2,215)	(3,187)	(3,355)
Income before equity in undistributed net income of subsidiaries	34,607	12,834	22,751
Equity in undistributed net income of subsidiaries	(6,782)	26,621	11,261
Net income available to common stockholders	$ 27,825	$ 39,455	$ 34,012

Parent Company Condensed Fina_5

Parent Company Condensed Financial Information -Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flows from Operating Activities
Net Income	$ 27,825	$ 39,455	$ 34,012
Adjustments to reconcile net income to net cash from operating activities:
Provision for deferred tax expense (benefit)	(646)	6,436	9,840
Change in taxes payable	811	1,546	1,678
Stock-based compensation	2,089	2,516	2,257
Net cash provided by (used in) operating activities	25,987	52,637	54,907
Cash Flows from Investing Activities
Cash paid for acquisition, net of cash and cash equivalents retained			(35,711)
Net cash used in investing activities	(103,808)	42,212	(25,841)
Cash Flows from Financing Activities
Dividend paid on common stock	(1,186)	(1,195)	(1,189)
Purchases of treasury stock	(5,922)	(666)	(505)
Redemption of junior subordinated debentures	(32,604)
Issuance of term note	20,000
Repayment of term note	(307)	(8,798)	(8,069)
Proceeds from exercise of stock option		32	33
Net cash (used in) provided by financing activities	357,092	(99,452)	(29,664)
Net change in cash and cash equivalents	279,271	(4,603)	(598)
Cash and cash equivalents at beginning of year	50,632	55,235	55,833
Cash and cash equivalents at end of year	329,903	50,632	55,235
Parent Company [Member]
Cash Flows from Operating Activities
Net Income	27,825	39,455	34,012
Adjustments to reconcile net income to net cash from operating activities:
Equity in undistributed net income of subsidiaries	6,782	(26,621)	(11,261)
Provision for deferred tax expense (benefit)	(514)	4,186	6,697
Change in taxes payable	5,933	3,896	(1,211)
Change in other assets	954		97
Stock-based compensation	2,089	2,516	2,257
Other, net	682	(80)	172
Net cash provided by (used in) operating activities	43,751	23,352	30,763
Cash Flows from Investing Activities
Cash paid for acquisition, net of cash and cash equivalents retained			(47,074)
Net cash used in investing activities			(47,074)
Cash Flows from Financing Activities
Net change in other short-term borrowings		(4,000)	4,000
Dividend paid on common stock	(1,186)	(1,195)	(1,189)
Purchases of treasury stock	(5,922)	(666)	(505)
Redemption of junior subordinated debentures	(32,604)
Issuance of term note	20,000
Repayment of term note	(3,000)
Proceeds from exercise of stock option		32	33
Net cash (used in) provided by financing activities	(22,712)	(5,829)	2,339
Net change in cash and cash equivalents	21,039	17,523	(13,972)
Cash and cash equivalents at beginning of year	26,562	9,039	23,011
Cash and cash equivalents at end of year	$ 47,601	$ 26,562	$ 9,039

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Millions	12 Months Ended		24 Months Ended
Employee Benefit Plans (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2017	Dec. 31, 2019
Employee Benefit Plans
Expense relating to the 401(k) plan	$ 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)			100.00%
Company's discretionary matching contributions to the Plan (as a percent)			50.00%
Percentage of compensation contributed to the Plan matched by employer (as a percent)			2.00%
Percentage of compensation contributed to the Plan matched by employer			3.00%
Participants vesting as percentage of discretionary matching contributions		100.00%
Expense relating to the 401(k) plan			$ 1.1