Other Comprehensive Income (Loss) - Changes in components of other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,011,287	$ 982,517	$ 972,060
Current period changes in other comprehensive income (loss)	23,706	(890)	3,710
Balance at end of year	1,079,081	1,011,287	982,517
Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			0
Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			972,060
Accumulated Other Comprehensive (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(69,625)	(68,735)	(71,897)
Current period changes in other comprehensive income (loss)	23,706	(890)	3,710
Balance at end of year	(45,919)	(69,625)	(68,735)
Accumulated Other Comprehensive (Loss) | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(548)
Accumulated Other Comprehensive (Loss) | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(72,445)
Unrealized Gains on Debt Securities Available for Sale
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	31,028	9,377	(13,162)
Current period changes in other comprehensive income (loss)	(29,384)	21,651	23,087
Balance at end of year	1,644	31,028	9,377
Unrealized Gains on Debt Securities Available for Sale | Cumulative Effect, Period of Adoption, Adjustment
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(548)
Unrealized Gains on Debt Securities Available for Sale | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(13,710)
Unrealized (Losses) on Swaps
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(16,856)	(8,474)	(2,006)
Current period changes in other comprehensive income (loss)	11,939	(8,382)	(6,468)
Balance at end of year	(4,917)	(16,856)	(8,474)
Unrealized (Losses) on Swaps | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			(2,006)
Employee Benefit Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period	(83,797)	(69,638)	(56,729)
Current period changes in other comprehensive income (loss)	41,151	(14,159)	(12,909)
Balance at end of year	$ (42,646)	$ (83,797)	(69,638)
Employee Benefit Plans | Cumulative Effect, Period of Adoption, Adjusted Balance
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance at beginning of period			$ (56,729)