Fair Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financial assets [Abstract]
Debt securities available-for-sale	$ 1,241,080	$ 1,256,226
Equity securities at fair value	2,380	2,166
Federal Reserve Bank stock	4,887	4,887
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	235,874	128,686
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,241,080	1,256,226
Equity securities at fair value	2,380	2,166
Loans held for sale	182	109
Loans, net	3,730,676	3,663,309
Federal Home Loan Bank stock	4,826	6,676
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	19,012	19,592
Financial liabilities [Abstract]
Deposits	4,543,424	4,426,143
Repurchase agreements	208,777	215,431
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	350	355
Long-term debt	64,404	57,841
Accrued interest payable	4,138	2,237
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	235,874	128,686
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	352,714	346,265
Equity securities at fair value	0	0
Loans held for sale	188	112
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	1,409,839	1,394,915
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	888,366	909,961
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	4,826	6,676
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	19,012	19,592
Financial liabilities [Abstract]
Deposits	3,149,951	3,050,144
Repurchase agreements	0	0
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	366	380
Long-term debt	0	0
Accrued interest payable	4,138	2,237
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	2,380	2,166
Loans held for sale	0	0
Loans, net	3,603,902	3,511,810
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	208,930	215,542
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	60,191	55,860
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