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Parent Company Financial Statements (Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities                      
Net income $ 13,977 $ 14,057 $ 12,217 $ 12,820 $ (3,173) [1] $ 11,339 $ 10,234 $ 10,076 $ 53,071 $ 28,476 $ 40,067
(Increase) decrease in other assets                 (6,353) 12,060 11,836
Net cash provided by operating activities                 64,334 58,334 57,418
Investing Activities                      
Net cash used in investing activities                 (276,777) (212,131) (167,953)
Financing Activities                      
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings                 350 606 (894)
Payments for Repurchase of Common Stock                 (27) 0 0
Cash dividends paid on common stock and cash in lieu for fractional shares paid due to stock split                 (17,170) (14,323) (12,394)
Net cash provided by financing activities                 176,471 169,061 118,754
Net (decrease) increase in cash, cash equivalents and restricted cash                 (35,972) 15,264 8,219
Cash, cash equivalents and restricted cash at beginning of year       102,971       87,707 102,971 87,707 79,488
Cash, cash equivalents and restricted cash at end of year 66,999       102,971       66,999 102,971 87,707
Parent Company [Member]                      
Operating Activities                      
Net income                 53,071 28,476 40,067
Equity in undistributed income of subsidiaries                 (27,971) (17,405) (26,655)
Gain on sale of investment securities                 0 (32) (4)
(Increase) decrease in other assets                 (1,772) (1,930) 1,213
Increase (decrease) in due to subsidiaries                 82 (20) 640
Increase (decrease) in other liabilities                 (4,763) 3,721 (2,519)
Net cash provided by operating activities                 18,647 12,810 12,742
Investing Activities                      
Proceeds from Sale of Available-for-sale Securities, Equity                 214 110 84
Net cash used in investing activities                 214 110 84
Financing Activities                      
Net proceeds from issuance of common stock                 1,338 863 2,891
Payments for Repurchase of Common Stock                 (27) 0 0
Cash dividends paid on common stock and cash in lieu for fractional shares paid due to stock split                 (17,170) (14,323) (12,393)
Net cash provided by financing activities                 (15,859) (13,460) (9,502)
Net (decrease) increase in cash, cash equivalents and restricted cash                 3,002 (540) 3,324
Cash, cash equivalents and restricted cash at beginning of year       $ 29,365       $ 29,905 29,365 29,905 26,581
Cash, cash equivalents and restricted cash at end of year $ 32,367       $ 29,365       $ 32,367 $ 29,365 $ 29,905
[1] (1) In the fourth quarter of 2017, the Company recognized $14.3 million of additional income tax expense upon the revaluation of its deferred tax assets and liabilities upon enactment of the Tax Act on December 22, 2017, which lowered the federal corporate tax rate from 35.0% to 21.0%, effective January 1, 2018. The impact to fourth quarter 2017 basic and diluted EPS was $0.91 per share.