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Parent Company Financial Statements (Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income | $ 18,278 | $ 16,775 | $ 10,940 | $ 13,493 | $ 15,238 | $ 14,488 | $ 13,204 | $ 14,273 | $ 59,486 | $ 57,203 | $ 53,071
Increase in other assets |  |  |  |  |  |  |  |  | (10,912) | (1,005) | (9,029)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 18,230 | 32,871 | 64,334
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (294,452) | (55,835) | (276,777)
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  |  |  |  |  |  |  | (9,689) | (20,795) | (27)
Cash dividends paid on common stock |  |  |  |  |  |  |  |  | (19,842) | (18,572) | (17,170)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 346,360 | 31,601 | 176,471
Net increase (decrease) in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | 70,138 | 8,637 | (35,972)
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | 75,636 |  |  |  | 66,999 | 75,636 | 66,999 | 102,971
Cash, cash equivalents and restricted cash at end of year | 145,774 |  |  |  | 75,636 |  |  |  | 145,774 | 75,636 | 66,999
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Operating Activities |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  |  |  |  | 59,486 | 57,203 | 53,071
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | (23,299) | (22,579) | (27,971)
Increase in other assets |  |  |  |  |  |  |  |  | (5,228) | (2,935) | (1,772)
Increase (decrease) in due to subsidiaries |  |  |  |  |  |  |  |  | 71 | (109) | 82
(Decrease) increase in other liabilities |  |  |  |  |  |  |  |  | (83) | 4,298 | (4,763)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 30,947 | 35,878 | 18,647
Investing Activities |  |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Available-for-sale Securities, Equity |  |  |  |  |  |  |  |  | 1,712 | 0 | 214
Net cash used in investing activities |  |  |  |  |  |  |  |  | 1,712 | 0 | 214
Financing Activities |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common stock |  |  |  |  |  |  |  |  | 1,670 | 1,683 | 1,338
Common stock repurchases |  |  |  |  |  |  |  |  | (9,689) | (20,795) | (27)
Cash dividends paid on common stock |  |  |  |  |  |  |  |  | (19,842) | (18,572) | (17,170)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | (27,861) | (37,684) | (15,859)
Net increase (decrease) in cash, cash equivalents and restricted cash |  |  |  |  |  |  |  |  | 4,798 | (1,806) | 3,002
Cash, cash equivalents and restricted cash at beginning of year |  |  |  | $ 30,561 |  |  |  | $ 32,367 | 30,561 | 32,367 | 29,365
Cash, cash equivalents and restricted cash at end of year | $ 35,359 |  |  |  | $ 30,561 |  |  |  | $ 35,359 | $ 30,561 | $ 32,367

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