Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 81,793	$ 34,674	$ 41,279
Other comprehensive income (loss), net of tax:
Amortization of prior service credits, net of taxes of $27, $26 and $26 for the years ended December 31, 2021, 2020 and 2019, respectively	(58)	(59)	(59)
Amortization of net actuarial losses, net of taxes of ($159), ($120) and ($40) for the years ended December 31, 2021, 2020 and 2019, respectively	341	270	88
Unrecognized actuarial gains (losses), net of taxes of ($109), $484 and ($290) for the years ended December 31, 2021, 2020 and 2019, respectively	319	(1,112)	661
Change in net unrealized gains (losses) on securities available for sale, net of taxes of $3,455, ($2,169) and ($5,211) for the years ended December 31, 2021, 2020 and 2019, respectively	(7,484)	4,787	11,657
Reclassification adjustment for net losses included in net income, net of taxes of $35, ($216) and ($5) for the years ended December 31, 2021, 2020 and 2019, respectively	(78)	485	10
Net unrealized (loss) gain on cash flow hedges, net of taxes of ($7,494), $5,177 and $4,353 for the years ended December 31, 2021, 2020 and 2019, respectively	16,115	(11,658)	(9,567)
Change in fair value of liabilities related to instrument-specific credit risk, net of taxes of ($199), ($367) and ($74) for the years ended December 31, 2021, 2020 and 2019, respectively	427	828	155
Total other comprehensive income (loss), net of tax	9,582	(6,459)	2,945
Comprehensive net income	$ 91,375	$ 28,215	$ 44,224