Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 1,228	$ 22,980
Amortized cost one to five years	293,825	156,677
Amortized cost for five to ten years	281,389	315,630
Amortized cost for after ten years	309,868	340,539
Available for sale	886,310	835,826
Amortized Cost	1,162,976	1,153,611
Within one year, amortized cost	36,037	5,222
One to five years, amortized cost	202,480	65,739
Five to ten years, amortized cost	349,467	273,720
After ten years, amortized cost	1,007,547	870,896
Total amortized cost	1,595,531	1,215,577
Investment securities, held to maturity	2,052,772	1,552,443
Fair value within one year	1,225	22,984
Fair value for one to five years	276,489	156,397
Fair value for five to ten years	251,923	316,125
Fair value for after ten years	260,612	346,038
Total fair value	790,249	841,544
Investment securities, available for sale	1,041,020	1,160,812
Within one year, fair value	35,818	5,265
One to five years, fair value	195,376	66,982
Five to ten years, fair value	313,467	275,308
After ten years, fair value	809,438	880,830
Total fair value	1,354,099	1,228,385
Fair Value	1,754,214	1,559,991
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	41,329	60,600
Amortized Cost	41,329	60,600
Investment securities, held to maturity	59,694	48,482
Investment securities, available for sale	40,286	61,577
Fair Value	53,534	47,465
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	235,337	257,185
Amortized Cost	235,337	257,185
Investment securities, held to maturity	360,446	247,937
Investment securities, available for sale	210,485	257,691
Fair Value	313,826	244,136
Private labeled mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Investment securities, held to maturity	37,101	40,447
Investment securities, available for sale		0
Fair Value	$ 32,755	$ 40,005

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