Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Assets [Abstract]
Interest bearing deposits - time		$ 0	$ 350
Securities available for sale		985,050	518,400
Federal Home Loan Bank and Federal Reserve Bank Stock		18,427	18,359
Liabilities [Abstract]
Other borrowings		30,005	88,646
Subordinated debt		39,261	0
Subordinated debentures		39,507	39,456
Reciprocal deposits included in deposits with no stated maturity		521,106	388,369
Reciprocal deposits included in deposits with stated maturity		36,445	42,658
Recorded Book Balance [Member]
Assets [Abstract]
Cash and due from banks		42,435	53,295
Interest bearing deposits		4,121	12,009
Interest bearing deposits - time			350
Securities available for sale		985,050	518,400
Federal Home Loan Bank and Federal Reserve Bank Stock		18,427	18,359
Net loans and loans held for sale		2,919,455	2,768,675
Accrued interest receivable		12,402	10,108
Derivative financial instruments		19,202	5,464
Liabilities [Abstract]
Deposits with no stated maturity	[1]	3,105,019	2,427,190
Deposits with stated maturity	[1]	492,726	609,537
Other borrowings		30,005	88,646
Subordinated debt		39,261
Subordinated debentures		39,507	39,456
Accrued interest payable		1,408	1,296
Derivative financial instruments		12,690	4,402
Fair Value [Member]
Assets [Abstract]
Cash and due from banks		42,435	53,295
Interest bearing deposits		4,121	12,009
Interest bearing deposits - time			350
Securities available for sale		985,050	518,400
Net loans and loans held for sale		2,915,489	2,768,817
Accrued interest receivable		12,402	10,108
Derivative financial instruments		19,202	5,464
Liabilities [Abstract]
Deposits with no stated maturity		3,105,019	2,427,190
Deposits with stated maturity		495,694	610,235
Other borrowings		31,477	88,680
Subordinated debt		40,999
Subordinated debentures		28,941	33,149
Accrued interest payable		1,408	1,296
Derivative financial instruments		12,690	4,402
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and due from banks		42,435	53,295
Interest bearing deposits		4,121	12,009
Interest bearing deposits - time			0
Securities available for sale		0	0
Net loans and loans held for sale		0	0
Accrued interest receivable		1	8
Derivative financial instruments		0	0
Liabilities [Abstract]
Deposits with no stated maturity		3,105,019	2,427,190
Deposits with stated maturity		0	0
Other borrowings		0	0
Subordinated debt		0
Subordinated debentures		0	0
Accrued interest payable		62	97
Derivative financial instruments		0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets [Abstract]
Cash and due from banks		0	0
Interest bearing deposits		0	0
Interest bearing deposits - time			350
Securities available for sale		985,050	518,400
Net loans and loans held for sale		99,747	69,800
Accrued interest receivable		3,409	1,752
Derivative financial instruments		19,202	5,464
Liabilities [Abstract]
Deposits with no stated maturity		0	0
Deposits with stated maturity		495,694	610,235
Other borrowings		31,477	88,680
Subordinated debt		40,999
Subordinated debentures		28,941	33,149
Accrued interest payable		1,346	1,199
Derivative financial instruments		12,690	4,402
Significant Unobservable Inputs (Level 3) [Member]
Assets [Abstract]
Cash and due from banks		0	0
Interest bearing deposits		0	0
Interest bearing deposits - time			0
Securities available for sale		0	0
Net loans and loans held for sale		2,815,742	2,699,017
Accrued interest receivable		8,992	8,348
Derivative financial instruments		0	0
Liabilities [Abstract]
Deposits with no stated maturity		0	0
Deposits with stated maturity		0	0
Other borrowings		0	0
Subordinated debt		0
Subordinated debentures		0	0
Accrued interest payable		0	0
Derivative financial instruments		$ 0	$ 0

[1] Deposits with no stated maturity include reciprocal deposits with a recorded book balance of $521.106 million and $388.369 million at September 30, 2020 and December 31, 2019, respectively. Deposits with a stated maturity include reciprocal deposits with a recorded book balance of $36.445 million and $42.658 million at September 30, 2020 and December 31, 2019, respectively.