Loan Portfolio and Allowance for Credit Losses, Type of Collateral Dependent Loans by Portfolio Segment (Details) $ in Thousands	Sep. 30, 2022 USD ($)
Loans and Leases Receivable [Abstract]
Total loans	$ 4,629,491
Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	26,467
Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Commercial [Member]
Loans and Leases Receivable [Abstract]
Total loans	217,120
Commercial [Member] | Commercial Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	197,158
Commercial [Member] | Commercial Real Estate [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	283
Commercial [Member] | Commercial Real Estate [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Commercial [Member] | Commercial Real Estate [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Commercial [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	19,962
Commercial [Member] | Other [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	11
Commercial [Member] | Other [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Commercial [Member] | Other [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Real Estate Mortgage - 1 to 4 Family [Member]
Loans and Leases Receivable [Abstract]
Total loans	4,401,706
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member]
Loans and Leases Receivable [Abstract]
Total loans	4,074,713
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	22,720
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Real Estate Mortgage - 1 to 4 Family [Member] | First Mortgages [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member]
Loans and Leases Receivable [Abstract]
Total loans	57,652
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	286
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Loans [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member]
Loans and Leases Receivable [Abstract]
Total loans	269,341
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	3,151
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
Real Estate Mortgage - 1 to 4 Family [Member] | Home Equity Lines of Credit [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Installment [Member]
Loans and Leases Receivable [Abstract]
Total loans	10,665
Installment [Member] | Real Estate [Member]
Loans and Leases Receivable [Abstract]
Total loans	16
Installment [Member] | Investment Securities/Cash [Member]
Loans and Leases Receivable [Abstract]
Total loans	0
Installment [Member] | Other [Member]
Loans and Leases Receivable [Abstract]
Total loans	$ 0