Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,046,734	$ 1,022,788	$ 1,040,335	$ 1,053,595
Current period changes in other comprehensive income (loss)	24,496	(18,367)	27,749	(5,242)
Balance at end of year	1,079,150	1,007,431	1,079,150	1,007,431
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(155,482)	(166,171)	(158,735)	(179,296)
Current period changes in other comprehensive income (loss)	24,496	(18,367)	27,749	(5,242)
Balance at end of year	(130,986)	(184,538)	(130,986)	(184,538)
Unrealized gain (loss) on debt securities available for sale:
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(119,988)	(127,036)	(113,649)	(135,482)
Current period changes in other comprehensive income (loss)	31,001	(20,218)	24,662	(11,772)
Balance at end of year	(88,987)	(147,254)	(88,987)	(147,254)
Unrealized (loss) gain on swap contracts accounted for as cash flow hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	3,644	2,522	(414)	504
Current period changes in other comprehensive income (loss)	(6,534)	1,845	(2,476)	3,863
Balance at end of year	(2,890)	4,367	(2,890)	4,367
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(39,138)	(41,657)	(44,672)	(44,318)
Current period changes in other comprehensive income (loss)	29	6	5,563	2,667
Balance at end of year	$ (39,109)	$ (41,651)	$ (39,109)	$ (41,651)