Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 1,535	$ 22,980
Amortized cost one to five years	340,212	156,677
Amortized cost for five to ten years	238,045	315,630
Amortized cost for after ten years	303,936	340,539
Available for sale	883,728	835,826
Amortized Cost	1,137,702	1,153,611
Within one year, amortized cost	32,610	5,222
One to five years, amortized cost	222,443	65,739
Five to ten years, amortized cost	324,967	273,720
After ten years, amortized cost	1,006,745	870,896
Total amortized cost	1,586,765	1,215,577
Investment securities, held to maturity	2,022,748	1,552,443
Fair value within one year	1,512	22,984
Fair value for one to five years	312,137	156,397
Fair value for five to ten years	204,282	316,125
Fair value for after ten years	257,756	346,038
Total fair value	775,687	841,544
Investment securities, available for sale	997,558	1,160,812
Within one year, fair value	32,382	5,265
One to five years, fair value	209,854	66,982
five to ten years, fair value	280,618	275,308
After ten years, fair value	793,544	880,830
Total fair value	1,316,398	1,228,385
Fair Value	1,681,309	1,559,991
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	33,011	60,600
Amortized Cost	33,011	60,600
Investment securities, held to maturity	56,564	48,482
Investment securities, available for sale	31,215	61,577
Fair Value	47,699	47,465
Federal agency mortgage–backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	220,963	257,185
Amortized Cost	220,963	257,185
Investment securities, held to maturity	343,953	247,937
Investment securities, available for sale	190,656	257,691
Fair Value	287,239	244,136
Private labeled mortgage–backed pools
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost		0
Investment securities, held to maturity	35,466	40,447
Investment securities, available for sale		0
Fair Value	$ 29,973	$ 40,005

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