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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]
Amortized cost within one year	$ 48,715	$ 44,206
Amortized cost one to five years	72,803	61,594
Amortized cost for five to ten years	204,419	136,857
Amortized cost for after ten years	716,694	589,200
Available for sale	1,042,631	831,857
Amortized Cost	1,243,312	1,090,363
Within one year, amortized cost	6,303	7,302
One to five years, amortized cost	43,736	42,742
Five to ten years, amortized cost	77,214	82,087
After ten years, amortized cost	24,221	25,290
Total amortized cost	151,474	157,421
Investment securities, held to maturity	161,650	168,676
Fair value within one year	48,714	44,192
Fair value for one to five years	74,114	63,006
Fair value for five to ten years	207,260	145,102
Fair value for after ten years	725,648	615,473
Total fair value	1,055,736	867,773
Investment securities, available for sale	1,262,175	1,134,025
Within one year, fair value	6,329	7,327
One to five years, fair value	45,317	44,358
five to ten years, fair value	82,247	88,300
After ten years, fair value	26,690	28,471
Total fair value	160,583	168,456
Fair Value	170,949	179,990
Federal agency collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Available for sale	116,072	144,022
Amortized Cost	116,072	144,022
Investment securities, held to maturity	1,959	2,661
Investment securities, available for sale	119,088	147,453
Fair Value	1,979	2,697
Federal agency mortgage-backed pools
Schedule of Available-for-sale Securities [Line Items]
Available for sale	84,609	114,484
Amortized Cost	84,609	114,484
Investment securities, held to maturity	8,217	8,594
Investment securities, available for sale	87,351	118,799
Fair Value	$ 8,387	$ 8,837

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