Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 22,980	$ 44,206
Amortized cost one to five years	156,677	61,594
Amortized cost for five to ten years	315,630	136,857
Amortized cost for after ten years	340,539	589,200
Available for sale	835,826	831,857
Amortized Cost	1,153,611	1,090,363
Within one year, amortized cost	5,222	7,302
One to five years, amortized cost	65,739	42,742
Five to ten years, amortized cost	273,720	82,087
After ten years, amortized cost	870,896	25,290
Total amortized cost	1,215,577	157,421
Investment securities, held to maturity	1,552,443	168,676
Fair value within one year	22,984	44,192
Fair value for one to five years	156,397	63,006
Fair value for five to ten years	316,125	145,102
Fair value for after ten years	346,038	615,473
Total fair value	841,544	867,773
Investment securities, available for sale	1,160,812	1,134,025
Within one year, fair value	5,265	7,327
One to five years, fair value	66,982	44,358
five to ten years, fair value	275,308	88,300
After ten years, fair value	880,830	28,471
Total fair value	1,228,385	168,456
Fair Value	1,559,991	179,990
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	60,600	144,022
Amortized Cost	60,600	144,022
Investment securities, held to maturity	48,482	2,661
Investment securities, available for sale	61,577	147,453
Fair Value	47,465	2,697
Federal agency mortgage–backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	225,329	114,484
Amortized Cost	225,329	114,484
Investment securities, held to maturity	188,426	8,594
Investment securities, available for sale	226,074	118,799
Fair Value	185,965	8,837
Private labeled mortgage–backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	31,856	0
Amortized Cost	31,856
Investment securities, held to maturity	99,958	0
Investment securities, available for sale	31,617	0
Fair Value	$ 98,176	$ 0

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