Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 1,043	$ 22,980
Amortized cost one to five years	313,400	156,677
Amortized cost for five to ten years	261,596	315,630
Amortized cost for after ten years	308,374	340,539
Available for sale	884,413	835,826
Amortized Cost	1,147,467	1,153,611
Within one year, amortized cost	32,861	5,222
One to five years, amortized cost	209,055	65,739
Five to ten years, amortized cost	339,857	273,720
After ten years, amortized cost	1,005,745	870,896
Total amortized cost	1,587,518	1,215,577
Investment securities, held to maturity	2,031,536	1,552,443
Fair value within one year	1,030	22,984
Fair value for one to five years	287,251	156,397
Fair value for five to ten years	224,407	316,125
Fair value for after ten years	243,702	346,038
Total fair value	756,390	841,544
Investment securities, available for sale	985,655	1,160,812
Within one year, fair value	32,489	5,265
One to five years, fair value	195,644	66,982
Five to ten years, fair value	290,173	275,308
After ten years, fair value	749,320	880,830
Total fair value	1,267,626	1,228,385
Fair Value	1,640,589	1,559,991
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	36,269	60,600
Amortized Cost	36,269	60,600
Investment securities, held to maturity	57,972	48,482
Investment securities, available for sale	34,624	61,577
Fair Value	49,680	47,465
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	226,785	257,185
Amortized Cost	226,785	257,185
Investment securities, held to maturity	349,875	247,937
Investment securities, available for sale	194,641	257,691
Fair Value	292,516	244,136
Private labeled mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Investment securities, held to maturity	36,171	40,447
Investment securities, available for sale		0
Fair Value	$ 30,767	$ 40,005

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