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Parent Company Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 15,238 | $ 14,488 | $ 13,204 | $ 14,273 | $ 13,977 | $ 14,057 | $ 12,217 | $ 12,820 | $ 57,203 | $ 53,071 | $ 28,476
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (22,405) | (6,679) | 11,190
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 32,871 | 64,334 | 58,334
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash used by investing activities |  |  |  |  |  |  |  |  | (55,835) | (276,777) | (212,131)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  | (20,795) | (27) | 0
Cash dividends paid on common stock |  |  |  |  |  |  |  |  | (18,572) | (17,170) | (14,323)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 31,601 | 176,471 | 169,061
Net increase (decrease) in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | 8,637 | (35,972) | 15,264
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | 66,999 |  |  |  | 102,971 | 66,999 | 102,971 | 87,707
Cash, cash equivalents and restricted cash at end of year | 75,636 |  |  |  | 66,999 |  |  |  | 75,636 | 66,999 | 102,971
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 57,203 | 53,071 | 28,476
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (22,579) | (27,971) | (17,405)
(Increase) decrease in other assets |  |  |  |  |  |  |  |  | (2,935) | (1,772) | (1,962)
(Decrease) increase in due to subsidiaries |  |  |  |  |  |  |  |  | (109) | 82 | (20)
Increase (decrease) in other liabilities |  |  |  |  |  |  |  |  | 4,298 | (4,763) | 3,721
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 35,878 | 18,647 | 12,810
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 0 | 214 | 110
Net cash used by investing activities |  |  |  |  |  |  |  |  | 0 | 214 | 110
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 1,683 | 1,338 | 863
Common stock repurchases |  |  |  |  |  |  |  |  | (20,795) | (27) | 0
Cash dividends paid on common stock |  |  |  |  |  |  |  |  | (18,572) | (17,170) | (14,323)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (37,684) | (15,859) | (13,460)
Net increase (decrease) in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | (1,806) | 3,002 | (540)
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | $ 32,367 |  |  |  | $ 29,365 | 32,367 | 29,365 | 29,905
Cash, cash equivalents and restricted cash at end of year | $ 30,561 |  |  |  | $ 32,367 |  |  |  | $ 30,561 | $ 32,367 | $ 29,365

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