Other Comprehensive Income (Loss) - Changes in Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,079,081	$ 1,011,287
Current period changes in other comprehensive (loss) income	(54,436)	(2,882)
Balance at end of year	1,032,487	999,649
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(45,919)	(69,625)
Current period changes in other comprehensive (loss) income	(54,436)	(2,882)
Balance at end of year	(100,355)	(72,507)
Unrealized Gains (Losses) on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	1,644	31,028
Current period changes in other comprehensive (loss) income	(57,818)	(17,020)
Balance at end of year	(56,174)	14,008
Unrealized (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(4,917)	(16,856)
Current period changes in other comprehensive (loss) income	3,157	5,683
Balance at end of year	(1,760)	(11,173)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(42,646)	(83,797)
Current period changes in other comprehensive (loss) income	225	8,455
Balance at end of year	$ (42,421)	$ (75,342)