Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,038,890	$ 1,032,487	$ 1,053,595	$ 1,079,081
Current period changes in other comprehensive income (loss)	1,687	(55,490)	13,125	(109,926)
Balance at end of year	1,022,788	1,074,284	1,022,788	1,074,284
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(167,858)	(100,355)	(179,296)	(45,919)
Current period changes in other comprehensive income (loss)	1,687	(55,490)	13,125	(109,926)
Balance at end of year	(166,171)	(155,845)	(166,171)	(155,845)
Unrealized Gains (Losses) on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(123,349)	(56,174)	(135,482)	1,644
Current period changes in other comprehensive income (loss)	(3,687)	(37,527)	8,446	(95,345)
Balance at end of year	(127,036)	(93,701)	(127,036)	(93,701)
Unrealized Gains (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(361)	(1,760)	504	(4,917)
Current period changes in other comprehensive income (loss)	2,883	828	2,018	3,985
Balance at end of year	2,522	(932)	2,522	(932)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(44,148)	(42,421)	(44,318)	(42,646)
Current period changes in other comprehensive income (loss)	2,491	(18,791)	2,661	(18,566)
Balance at end of year	$ (41,657)	$ (61,212)	$ (41,657)	$ (61,212)