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Parent Company Financial Information (Details 2) - 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, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash Flows From Operating Activities:                              
Net Income $ 40,317 $ 38,948 $ 37,296 $ 35,715 $ 15,569 $ 29,874 $ 27,772 $ 27,017 $ 25,717 $ 24,523 $ 24,145 $ 23,322 $ 152,276 $ 100,232 $ 97,707
Adjustments to reconcile net income to net cash provided by operating activities:                              
Net tax benefits from stock compensation                         110 460  
Excess tax benefit on stock-based compensation                             (400)
Increase in other assets                         (17,301) (19,324) (5,025)
(Decrease) increase in other liabilities                         2,061 10,348 8,545
Net cash provided by operating activities                         164,455 160,924 116,820
Cash Flows From Investing Activities:                              
Proceeds from sale of available-for-sale securities                         36,300 73,100 94,300
Net cash provided by (used in) investing activities                         (783,801) (810,377) (750,952)
Cash Flows From Financing Activities:                              
Proceeds from exercise of equity compensation plans                         776 372 955
Excess tax benefit on stock-based compensation                             400
Proceeds from employee stock purchase plan                         808 836 801
Net cash provided by financing activities                         750,737 471,763 703,932
Net (Decrease) Increase in Cash                         131,391 (177,690) 69,800
Cash and Cash Equivalents at Beginning of Period       190,473       368,163       298,363 190,473 368,163 298,363
Cash and Cash Equivalents at End of Period 321,864       190,473       368,163       321,864 190,473 368,163
Parent Company [Member]                              
Cash Flows From Operating Activities:                              
Net Income                         152,276 100,232 97,707
Adjustments to reconcile net income to net cash provided by operating activities:                              
Equity in undistributed income of subsidiary                         (163,393) (108,941) (103,374)
Net tax benefits from stock compensation                         110 460
Excess tax benefit on stock-based compensation                             (400)
Increase in other assets                         (2,508) (988) (1,491)
(Decrease) increase in other liabilities                         (61) (189) 3,186
Net cash provided by operating activities                         (13,576) (9,426) (4,372)
Cash Flows From Investing Activities:                              
Proceeds from sale of available-for-sale securities                             135
Investment in subsidiary (net)                         6,892 (460) (124,636)
Net cash provided by (used in) investing activities                         6,892 (460) (124,501)
Cash Flows From Financing Activities:                              
Issuance in long-term borrowings                             147,586
Proceeds from exercise of equity compensation plans                         776 372 955
Excess tax benefit on stock-based compensation                             400
Proceeds from employee stock purchase plan                         808 836 801
Net cash provided by financing activities                         1,584 1,208 149,742
Net (Decrease) Increase in Cash                         (5,100) (8,678) 20,869
Cash and Cash Equivalents at Beginning of Period       $ 77,883       $ 86,561       $ 65,692 77,883 86,561 65,692
Cash and Cash Equivalents at End of Period $ 72,783       $ 77,883       $ 86,561       $ 72,783 $ 77,883 $ 86,561