Other Comprehensive Income (Loss) - Tax effects of components in other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Before Tax
Other comprehensive income (loss)	$ 24,411	$ (1,122)	$ 4,690
Tax Effect
Other comprehensive income (loss)	(705)	232	(980)
After Tax
Total other comprehensive income (loss)	23,706	(890)	3,710
Unrealized Gains on Debt Securities Available for Sale
Before Tax
Other comprehensive income (loss), before reclassifications	(39,000)	26,876	26,601
Other comprehensive income (loss)	(37,003)	27,406	29,224
Tax Effect
Other comprehensive income (loss), before reclassifications	8,021	(5,640)	(5,534)
Other comprehensive income (loss)	7,619	(5,755)	(6,137)
After Tax
Other comprehensive income (loss), before reclassifications	(30,979)	21,236	21,067
Total other comprehensive income (loss)	(29,384)	21,651	23,087
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Accretion Of Unrealized Gains (Losses), Parent
Before Tax
Reclassification from AOCI, current period	(28)	160	11
Tax Effect
Reclassification from AOCI, current period	25	(34)	(2)
After Tax
Reclassification from AOCI, current period	(3)	126	9
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Other Reclassifications, Parent
Before Tax
Reclassification from AOCI, current period	2,025	370	2,612
Tax Effect
Reclassification from AOCI, current period	(427)	(81)	(601)
After Tax
Reclassification from AOCI, current period	1,598	289	2,011
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Before Tax
Other comprehensive income (loss), before reclassifications	14,514	(10,605)	(8,193)
Tax Effect
Other comprehensive income (loss), before reclassifications	(2,575)	2,223	1,725
After Tax
Other comprehensive income (loss), before reclassifications	11,939	(8,382)	(6,468)
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(55)	(56)	(56)
Tax Effect
Reclassification from AOCI, current period	16	12	12
After Tax
Reclassification from AOCI, current period	(39)	(44)	(44)
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent
Before Tax
Reclassification from AOCI, current period	(4,044)	(4,284)	(3,709)
Tax Effect
Reclassification from AOCI, current period	1,129	900	779
After Tax
Reclassification from AOCI, current period	(2,915)	(3,384)	(2,930)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Before Tax
Other comprehensive income (loss), before reclassifications	50,999	(13,583)	(12,576)
Other comprehensive income (loss)	46,900	(17,923)	(16,341)
Tax Effect
Other comprehensive income (loss), before reclassifications	(6,894)	2,852	2,641
Other comprehensive income (loss)	(5,749)	3,764	3,432
After Tax
Other comprehensive income (loss), before reclassifications	44,105	(10,731)	(9,935)
Total other comprehensive income (loss)	$ 41,151	$ (14,159)	$ (12,909)