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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

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