Goodwill and Identifiable Intangible Assets - Schedule of Identifiable Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 106,271	$ 106,271
Accumulated Amortization	102,631	101,197
Net Carrying Amount	$ 3,640	5,074
Remaining Weighted-Average Amortization Periods in Years	14 years
Core Deposit Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 87,674	87,674
Accumulated Amortization	87,199	86,280
Net Carrying Amount	$ 475	1,394
Remaining Weighted-Average Amortization Periods in Years	3 years 4 months 24 days
Insurance Intangibles [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 17,272	17,272
Accumulated Amortization	14,157	13,709
Net Carrying Amount	$ 3,115	3,563
Remaining Weighted-Average Amortization Periods in Years	15 years 9 months 18 days
Banking Charters [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,325	1,325
Accumulated Amortization	1,275	1,208
Net Carrying Amount	$ 50	$ 117
Remaining Weighted-Average Amortization Periods in Years	9 months 18 days