Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Net income	$ 26,684	$ 21,840	$ 16,512
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	7,462	2,826	1,318
Depreciation, amortization and accretion, net	8,134	7,936	4,442
Change in cash surrender value of bank owned life insurance	(1,126)	(671)	0
Insured Event, Gain (Loss)	511	0	0
Stock-based compensation expense	954	384	378
Gains on investment securities, net	(616)	(1,192)	(452)
Loss (gain) on sales of other real property owned, net	667	(1)	(21)
Donation of building	0	653	0
Loss on write down of premises and equipment	11	28	221
Gain (Loss) on Sales of Loans, Net	(698)	0	0
Gains on sale of loans held for sale, net	(1,102)	(1,224)	(763)
Deferred income taxes	2,498	(2,388)	20
Increase in accrued interest receivable	(279)	(629)	(763)
Increase (decrease) in accrued interest payable	94	(84)	(54)
Origination of loans held for sale	(67,321)	(79,682)	(56,091)
Proceeds from sale of loans held for sale	68,573	80,699	57,844
Decrease in other assets	668	1,802	169
Increase (decrease) in other liabilities	666	(2,875)	(762)
Net cash provided by operating activities	46,154	27,422	21,998
Cash flows from investing activities:
Proceeds from maturities of certificates of deposit investments	12,958	25,245	1,245
Purchases of certificates of deposit investments	0	(12,958)	(26,245)
Proceeds from sales of securities available-for-sale	159,663	70,757	19,380
Proceeds from maturities of securities held-to-maturity	73,310	117,003	103,481
Proceeds from maturities of securities available-for-sale	0	83,000	10,000
Purchases of securities available-for-sale	(183,319)	(194,946)	(257,693)
Purchases of securities held-to-maturity	0	(71,557)	(46,000)
Net increase in loans	(123,931)	(106,608)	(68,958)
Proceeds from sale of premises and equipment	0	147	0
Purchases of premises and equipment	(1,274)	(695)	(1,762)
Proceeds from sales of other real property owned	5,559	793	260
Investment in bank owned life insurance	0	(25,000)	0
Capitalization of mortgage servicing rights	0	(14)	0
Proceeds from Life Insurance Policies	1,072	0	0
Cash received related to acquisition, net of cash and cash equivalents acquired	0	36,774	276,661
Net cash provided by (used in) investing activities	(55,962)	(78,059)	10,369
Cash flows from financing activities:
Net (decrease) increase in deposits	(55,248)	60,632	6,844
(Decrease) Increase in repurchase agreements	(30,375)	33,658	3,176
Proceeds from FHLB advances	52,000	20,000	5,000
Repayment of FHLB advances	(32,000)	(15,000)	(5,000)
Proceeds from short-term debt	0	7,000	2,000
Repayment of short-term debt	(4,000)	(3,938)	(2,000)
Proceeds from long-term debt	0	15,000	0
Repayments of Long-term Debt	3,750	0	0
Proceeds from issuance of common stock	4,399	195	28,222
Direct expenses related to capital transactions	(216)	(229)	0
Purchase of treasury stock	(797)	0	(1,066)
Dividends paid on preferred stock	0	(1,286)	(2,002)
Dividends paid on common stock	(7,228)	(5,277)	(3,487)
Net cash provided by (used in) financing activities	(77,215)	110,755	31,687
Increase (decrease) in cash and cash equivalents	(87,023)	60,118	64,054
Cash and cash equivalents at beginning of period	175,902	115,784	51,730
Cash and cash equivalents at end of period	88,879	175,902	115,784
Cash paid during the period for:
Interest	6,415	4,113	3,428
Income taxes	11,721	13,135	7,796
Supplemental disclosures of noncash investing and financing activities
Loans transferred to other real estate owned	6,034	328	458
Dividends reinvested in common stock	1,057	1,323	1,266
Net tax benefit related to option and deferred compensation plans	221	140	85
Conversion of preferred stock	0	27,500	0
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed [Abstract]
Fair value of assets acquired		668,905
Cash paid		22,545
Common stock issued		65,926
Total consideration paid		88,471
Fair value of liabilities assumed		$ 580,434