Fair Value of Financial Assets and Liabilities, Estimated Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial assets [Abstract]
Debt securities available-for-sale	$ 1,135,878	$ 1,256,226
Equity securities at fair value	2,900	2,166
Federal Reserve Bank stock	4,887	4,887
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	219,258	128,686
Certificates of deposit in other banks	245	245
Debt securities available-for-sale	1,135,878	1,256,226
Equity securities at fair value	2,900	2,166
Loans held for sale	0	109
Loans, net	3,936,300	3,663,309
Federal Home Loan Bank stock	7,670	6,676
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	21,467	19,592
Financial liabilities [Abstract]
Deposits	4,627,892	4,426,143
Repurchase agreements	232,577	215,431
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	340	355
Long-term debt	64,296	57,841
Accrued interest payable	8,210	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	219,258	128,686
Certificates of deposit in other banks	0	0
Debt securities available-for-sale	331,200	346,265
Equity securities at fair value	0	0
Loans held for sale	0	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	1,314,189	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	804,678	909,961
Equity securities at fair value	0	0
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	7,670	6,676
Federal Reserve Bank stock	4,887	4,887
Accrued interest receivable	21,467	19,592
Financial liabilities [Abstract]
Deposits	3,325,940	3,050,144
Repurchase agreements	0	0
Federal funds purchased	500	500
Advances from Federal Home Loan Bank	354	380
Long-term debt	0	0
Accrued interest payable	8,210	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	2,900	2,166
Loans held for sale	0	0
Loans, net	3,753,898	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	232,627	215,542
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	52,150	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