Fair Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financial assets [Abstract]
Debt securities available-for-sale	$ 1,298,592	$ 1,455,429
Equity securities at fair value	1,969	2,253
Federal Reserve Bank stock	4,887	4,887
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	259,629	311,756
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,298,592	1,455,429
Equity securities at fair value	1,969	2,253
Loans held for sale	1,043	2,632
Loans, net	3,586,183	3,367,057
Federal Home Loan Bank stock	6,676	8,139
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	16,513	15,415
Financial liabilities [Abstract]
Deposits	4,535,068	4,344,292
Repurchase agreements	230,123	271,088
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	360	375
Long-term debt	57,841	57,841
Accrued interest payable	2,501	1,016
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	259,629	311,756
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	362,015	242,214
Equity securities at fair value	0	0
Loans held for sale	1,065	2,693
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	1,481,078	1,331,103
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	936,577	1,213,215
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	6,676	8,139
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	16,513	15,415
Financial liabilities [Abstract]
Deposits	3,064,938	3,043,339
Repurchase agreements	0	0
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	381	400
Long-term debt	0	0
Accrued interest payable	2,501	1,016
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	1,969	2,253
Loans held for sale	0	0
Loans, net	3,540,716	3,480,803
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	230,238	271,186
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	50,759	45,854
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