Fair Value - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Available for sale securities:
Securities available-for-sale, carried at fair value	$ 736,654	$ 283,448
Collateralized mortgage obligations [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	106,299	82,101
Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	736,654
Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	106,299	82,101
Obligations of U.S. government corporations and agencies [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	40,940	2,524
Obligations of U.S. government corporations and agencies [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	40,940	2,524
Mortgage-Backed Securities [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	277,182	89,647
Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	277,182	89,647
Asset-backed securities [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	30,546
Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	30,546
Corporate bonds [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	44,169	12,101
Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	44,169	12,101
Obligations of state and political subdivisions [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	237,518	95,439
Obligations of state and political subdivisions [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	237,518	92,028
Obligations of state and political subdivisions [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value		3,411
Equity Securities [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	1,090
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	1,090
Mortgage banking derivative - asset [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	3,833	892
Mortgage banking derivative - asset [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	3,833	892
Loans Held For Sale At Fair Value
Available for sale securities:
Securities available-for-sale, carried at fair value	221,616
Loans Held For Sale At Fair Value | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	98,587
Loans Held For Sale At Fair Value | Fair Value, Inputs, Level 3 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	123,029
Purchased Certificate of Deposit Option [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	56
Purchased Certificate of Deposit Option [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	56
Interest Rate Swap Assets [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	1,870
Interest Rate Swap Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	1,870
Written Certificate of Deposit Option [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	56
Written Certificate of Deposit Option [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	56
Interest Rate Swap Liability [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	2,036
Interest Rate Swap Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value	$ 2,036
REMICs [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value		1,636
REMICs [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities:
Securities available-for-sale, carried at fair value		$ 1,636