Loan Portfolio and Allowance for Credit Losses, Type of Collateral Dependent Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans and Leases Receivable [Abstract]
Total loans	$ 4,799,582	$ 4,733,201
Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	25,001	25,695
Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans	246,307	231,011
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	223,131	209,922
Commercial [Member] | Commercial Real Estate [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	667	312
Commercial [Member] | Commercial Real Estate [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Commercial [Member] | Commercial Real Estate [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	23,176	21,089
Commercial [Member] | Other [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	319	334
Commercial [Member] | Other [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Commercial [Member] | Other [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans	4,537,949	4,489,883
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans	4,184,751	4,146,902
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	20,512	21,467
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans	56,708	56,549
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	231	236
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans	296,490	286,432
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	3,191	3,264
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans	15,326	12,307
Installment [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	81	82
Installment [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0	0
Installment [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	$ 0	$ 0