Fair Values of Financial Instruments (Details) - USD ($) $ in Thousands		Jun. 30, 2018	Dec. 31, 2017
Assets [Abstract]
Interest bearing deposits - time		$ 2,478	$ 2,739
Equity securities at fair value		336	0
Trading securities		0	455
Securities available for sale		450,593	522,925
Federal Home Loan Bank and Federal Reserve Bank Stock		16,321	15,543
Liabilities [Abstract]
Other borrowings		40,584	54,600
Subordinated debentures		39,354	35,569
Reciprocal deposits included in deposits with no stated maturity		22,000	13,000
Reciprocal deposits included in deposits with stated maturity		44,500	38,000
Recorded Book Balance [Member]
Assets [Abstract]
Cash and due from banks		36,433	36,994
Interest bearing deposits		22,278	17,744
Interest bearing deposits - time		2,478	2,739
Equity securities at fair value		336
Trading securities			455
Securities available for sale		450,593	522,925
Federal Home Loan Bank and Federal Reserve Bank Stock		16,321	15,543
Net loans and loans held for sale		2,507,944	2,035,666
Accrued interest receivable		9,722	8,609
Derivative financial instruments		6,307	3,080
Liabilities [Abstract]
Deposits with no stated maturity	[1]	2,120,537	1,845,716
Deposits with stated maturity	[1]	659,979	554,818
Other borrowings		40,584	54,600
Subordinated debentures		39,354	35,569
Accrued interest payable		1,331	892
Derivative financial instruments		2,573	1,292
Fair Value [Member]
Assets [Abstract]
Cash and due from banks		36,433	36,994
Interest bearing deposits		22,278	17,744
Interest bearing deposits - time		2,472	2,740
Equity securities at fair value		336
Trading securities			455
Securities available for sale		450,593	522,925
Net loans and loans held for sale		2,477,253	1,962,937
Accrued interest receivable		9,722	8,609
Derivative financial instruments		6,307	3,080
Liabilities [Abstract]
Deposits with no stated maturity		2,120,537	1,845,716
Deposits with stated maturity		654,745	551,489
Other borrowings		40,604	54,918
Subordinated debentures		36,082	29,946
Accrued interest payable		1,331	892
Derivative financial instruments		2,573	1,292
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets [Abstract]
Cash and due from banks		36,433	36,994
Interest bearing deposits		22,278	17,744
Interest bearing deposits - time		0	0
Equity securities at fair value		336
Trading securities			455
Securities available for sale		0	898
Net loans and loans held for sale		0	0
Accrued interest receivable		1	1
Derivative financial instruments		0	0
Liabilities [Abstract]
Deposits with no stated maturity		2,120,537	1,845,716
Deposits with stated maturity		0	0
Other borrowings		0	0
Subordinated debentures		0	0
Accrued interest payable		86	48
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		2,472	2,740
Equity securities at fair value		0
Trading securities			0
Securities available for sale		450,593	522,027
Net loans and loans held for sale		64,131	39,436
Accrued interest receivable		1,870	2,192
Derivative financial instruments		6,307	3,080
Liabilities [Abstract]
Deposits with no stated maturity		0	0
Deposits with stated maturity		654,745	551,489
Other borrowings		40,604	54,918
Subordinated debentures		36,082	29,946
Accrued interest payable		1,245	844
Derivative financial instruments		2,573	1,292
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	0
Equity securities at fair value		0
Trading securities			0
Securities available for sale		0	0
Net loans and loans held for sale		2,413,122	1,923,501
Accrued interest receivable		7,851	6,416
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 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 $22.0 million and $13.0 million at June 30, 2018 and December 31, 2017, respectively. Deposits with a stated maturity include reciprocal deposits with a recorded book balance of $44.5 million and $38.0 million June 30, 2018 and December 31, 2017, respectively.