Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 28,664	$ 76,945	$ 81,793
Other comprehensive income (loss), net of tax:
Amortization of actuarial (gains) losses, net of taxes of $123, $7, and ($159), respectively.	(276)	(17)	341
Amortization of prior service credits, net of taxes of $0, $8, and $27, respectively.		(19)	(58)
Unrecognized actuarial gains (losses), net of taxes of ($75), ($487), and ($109), respectively.	170	1,043	319
Change in net unrealized gains (losses) on securities available for sale, net of taxes of ($4,451), $28,900, and $3,455, respectively.	8,362	(64,381)	(7,484)
Reclassification adjustment for net (gains) losses included in net income, net of taxes of $0, ($3,401) and $35, respectively.		7,547	(78)
Net unrealized gains (losses) on cashflow hedges, net of taxes of $4,762, ($12,081) and ($7,216), respectively.	(10,584)	26,786	16,115
Change in fair value of liabilities related to instrument-specific credit risk, net of taxes of ($74), $386 and ($237), respectively.	165	(763)	427
Other comprehensive income (loss), net of tax:	(2,163)	(29,804)	9,582
Comprehensive net income (loss)	$ 26,501	$ 47,141	$ 91,375