Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 44,206	$ 37,386
Amortized cost one to five years	61,594	41,230
Amortized cost for five to ten years	136,857	117,004
Amortized cost for after ten years	589,200	213,574
Available for sale	831,857	409,194
Amortized Cost	1,090,363	822,089
Within one year, amortized cost	7,302	7,811
One to five years, amortized cost	42,742	56,037
Five to ten years, amortized cost	82,087	94,756
After ten years, amortized cost	25,290	32,163
Total amortized cost	157,421	190,767
Investment securities, held to maturity	168,676	207,899
Fair value within one year	44,192	37,321
Fair value for one to five years	63,006	41,293
Fair value for five to ten years	145,102	122,145
Fair value for after ten years	615,473	218,193
Total fair value	867,773	418,952
Investment securities, available for sale	1,134,025	834,776
Within one year, fair value	7,327	7,874
One to five years, fair value	44,358	57,048
five to ten years, fair value	88,300	98,480
After ten years, fair value	28,471	34,440
Total fair value	168,456	197,842
Fair Value	179,990	215,147
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	144,022	267,272
Amortized Cost	144,022	267,272
Investment securities, held to maturity	2,661	4,560
Investment securities, available for sale	147,453	269,252
Fair Value	2,697	4,568
Federal agency mortgage–backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	114,484	145,623
Amortized Cost	114,484	145,623
Investment securities, held to maturity	8,594	12,572
Investment securities, available for sale	118,799	146,572
Fair Value	$ 8,837	$ 12,737

Available for sale securities debt maturities rolling fair value.

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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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