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Fair Market Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Financial assets [Abstract]
Debt securities available-for-sale	$ 1,455,429	$ 997,261
Equity securities at fair value	2,253	2,471
Federal Reserve Bank stock	4,887	4,887
Mortgage servicing rights	6,774	4,068	$ 3,263	$ 3,607
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	311,756	338,235
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,455,429	997,261
Equity securities at fair value	2,253	2,471
Loans held for sale	2,632	23,259
Loans, net	3,367,057	3,506,189
Federal Home Loan Bank stock	8,139	10,048
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	15,415	15,818
Mortgage servicing rights	6,774	4,068
Financial liabilities [Abstract]
Deposits	4,344,292	4,016,082
Repurchase agreements	271,088	355,862
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	375	395
Long-term debt	57,841	57,841
Accrued interest payable	1,016	1,243
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	311,756	338,235
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	242,214	74,991
Equity securities at fair value	0	0
Loans held for sale	2,693	23,884
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	1,331,103	1,140,925
Repurchase agreements	0	0
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,213,215	922,270
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	8,139	10,048
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	15,415	15,818
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	3,043,339	2,913,217
Repurchase agreements	0	0
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	400	436
Long-term debt	0	0
Accrued interest payable	1,016	1,243
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	0	0
Equity securities at fair value	2,253	2,471
Loans held for sale	0	0
Loans, net	3,480,803	3,658,554
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	6,774	4,068
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	271,186	355,918
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	45,854	40,081
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	$ 0	$ 0

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- Definition

This item represents management's methodology (for example, procedures or techniques) for estimating the fair value as of the balance sheet date of the financial instrument (as defined), including financial assets and financial liabilities (collectively, as defined).

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Fair value portion of trade and related party payables and accrued expenses.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Fair value portion of deposit liabilities held by the entity, including, but not limited to, foreign and domestic, interest and noninterest bearing, demand deposits, saving deposits, negotiable orders of withdrawal (NOW) and time deposits.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank and securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Fair value portion of investments in Federal Home Loan Bank (FHLBank) stock.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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