Premises and Equipment - Components and Depreciation and Amortization Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Components of premises and equipment
Premises and equipment	$ 533,477	$ 537,498
Less: Accumulated depreciation and amortization	252,016	257,143
Net book value	281,461	280,355
Depreciation and amortization expenses	13,585	15,318	$ 15,831
Occupancy
Components of premises and equipment
Depreciation and amortization expenses	8,336	9,192	9,149
Equipment expense
Components of premises and equipment
Depreciation and amortization expenses	5,249	6,126	$ 6,682
Buildings
Components of premises and equipment
Premises and equipment	294,401	294,051
Furniture and equipment
Components of premises and equipment
Premises and equipment	82,807	92,276
Land
Components of premises and equipment
Premises and equipment	97,306	97,955
Leasehold improvements
Components of premises and equipment
Premises and equipment	$ 58,963	$ 53,216