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Parent Company Only Financial Statements Condensed statements of cash flows (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                      
Net income $ 6,797 $ 5,308 $ 4,929 $ 4,806 $ 4,654 $ 3,663 $ 4,156 $ 4,039 $ 21,840 $ 16,512 $ 15,461
Depreciation, amortization and accretion, net                 7,936 4,442 3,960
Increase in other assets                 (1,802) (169) (306)
Decrease in other liabilities                 (2,875) (762) (724)
Net cash provided by operating activities                 27,422 21,998 17,777
Cash Acquired from Acquisition                 36,774 276,661 0
Net cash provided by (used in) investing activities                 (78,059) 10,369 (10,030)
Repayment of short-term debt                 (3,938) (2,000) (1,000)
Proceeds from short-term debt                 7,000 2,000 1,000
Proceeds from long-term debt                 15,000 0 0
Proceeds from issuance of common stock                 195 28,222 488
Direct expenses related to capital transactions                 (229) 0 0
Purchase of treasury stock                 0 (1,066) (1,763)
Dividends paid on preferred stock                 (1,286) (2,002) (4,339)
Dividends paid on common stock                 (5,277) (3,487) (2,648)
Net cash provided by (used in) financing activities                 110,755 31,687 (21,119)
Increase (decrease) in cash                 60,118 64,054 (13,372)
Cash and cash equivalents at beginning of period       115,784       51,730 115,784 51,730 65,102
Cash and cash equivalents at end of period 175,902       115,784       175,902 115,784 51,730
Parent Company [Member]                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 21,840 16,512 15,461
Depreciation, amortization and accretion, net                 87 87 110
Dividends from subsidiaries                 19,475 6,094 7,900
Equity in undistributed earnings of subsidiaries                 (4,717) (11,934) (8,973)
Increase in other assets                 (111,379) (4,707) (7,412)
Decrease in other liabilities                 153 37 260
Net cash provided by operating activities                 (74,541) 6,089 7,346
Payments to Acquire Additional Interest in Subsidiaries                 (5,000) (27,825) 0
Cash Acquired from Acquisition                 68,798 0 0
Net cash provided by (used in) investing activities                 63,798 (27,825) 0
Repayment of short-term debt                 (3,000) 0 0
Proceeds from short-term debt                 7,000 0 0
Repayments of Long-term Debt                 (938) 0 0
Proceeds from long-term debt                 15,000 0 0
Conversion of preferred stock to shares of common stock                 (27,500) 0 (24,635)
Proceeds from issuance of common stock                 27,695 28,222 25,123
Direct expenses related to capital transactions                 (229) 0 0
Purchase of treasury stock                 0 (1,066) (1,763)
Dividends paid on preferred stock                 (1,286) (2,002) (4,339)
Dividends paid on common stock                 (5,277) (3,487) (2,648)
Net cash provided by (used in) financing activities                 11,465 21,667 (8,262)
Increase (decrease) in cash                 722 (69) (916)
Cash and cash equivalents at beginning of period       $ 1,660       $ 1,729 1,660 1,729 2,645
Cash and cash equivalents at end of period $ 2,382       $ 1,660       $ 2,382 $ 1,660 $ 1,729