Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 24,888	$ 10,103	$ 48,465	$ 25,566
Available-for-sale investment securities:
Gross unrealized holding (loss) gain arising during the period	(42,648)	3,525	(114,284)	(9,053)
Related tax benefit (expense)	10,238	(741)	26,686	1,901
Reclassification adjustment for net gain (loss) included in net income	44	202	(86)	538
Related tax (expense) benefit	(10)	(42)	20	(113)
Net effect on other comprehensive (loss) income	(32,376)	2,944	(87,664)	(6,727)
Defined benefit plan:
Net gain arising during the period	75	3	61	8
Related tax expense	(17)	0	(14)	(1)
Amortization of unrecognized gain and service cost on benefit plans	17	31	38	61
Related tax expense	(4)	(6)	(9)	(13)
Net effect on other comprehensive income	71	28	76	55
Cash flow hedges:
Net gain (loss) arising during the period	2,104	(294)	7,560	3,942
Related tax (expense) benefit	(492)	62	(1,712)	(828)
Net effect on other comprehensive income (loss)	1,612	(232)	5,848	3,114
Total other comprehensive (loss) income, net of tax	(30,693)	2,740	(81,740)	(3,558)
Total comprehensive (loss) income	$ (5,805)	$ 12,843	$ (33,275)	$ 22,008