Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 1,428	$ 22,980
Amortized cost one to five years	268,961	156,677
Amortized cost for five to ten years	296,072	315,630
Amortized cost for after ten years	322,823	340,539
Available for sale	889,284	835,826
Amortized Cost	1,186,135	1,153,611
Within one year, amortized cost	28,419	5,222
One to five years, amortized cost	199,131	65,739
Five to ten years, amortized cost	331,620	273,720
After ten years, amortized cost	988,992	870,896
Total amortized cost	1,548,162	1,215,577
Investment securities, held to maturity	2,006,129	1,552,443
Fair value within one year	1,406	22,984
Fair value for one to five years	259,422	156,397
Fair value for five to ten years	279,023	316,125
Fair value for after ten years	292,001	346,038
Total fair value	831,852	841,544
Investment securities, available for sale	1,112,512	1,160,812
Within one year, fair value	28,409	5,265
One to five years, fair value	194,886	66,982
Five to ten years, fair value	314,127	275,308
After ten years, fair value	868,008	880,830
Total fair value	1,405,430	1,228,385
Fair Value	1,827,845	1,559,991
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	50,201	60,600
Amortized Cost	50,201	60,600
Investment securities, held to maturity	56,841	48,482
Investment securities, available for sale	49,592	61,577
Fair Value	52,605	47,465
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	216,411	225,329
Amortized Cost	216,411	225,329
Investment securities, held to maturity	302,407	188,426
Investment securities, available for sale	202,435	226,074
Fair Value	279,050	185,965
Private labeled mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	30,239	31,856
Amortized Cost	30,239	31,856
Investment securities, held to maturity	98,719	99,958
Investment securities, available for sale	28,633	31,617
Fair Value	$ 90,760	$ 98,176

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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