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Parent Company Financial Information (Details 2) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash Flows From Operating Activities:                              
Net Income $ 15,569 $ 29,874 $ 27,772 $ 27,017 $ 25,717 $ 24,523 $ 24,145 $ 23,322 $ 22,348 $ 21,463 $ 20,938 $ 19,418 $ 100,232 $ 97,707 $ 84,167
Adjustments to reconcile net income to net cash provided by operating activities:                              
Net tax benefits from stock compensation                         460    
Excess tax benefit on stock-based compensation                           (400) (2,984)
Increase in other assets                         (19,324) (5,025) (3,725)
(Decrease) increase in other liabilities                         10,348 8,545 1,315
Net cash (used in) operating activities                         160,533 116,820 98,589
Cash Flows From Investing Activities:                              
Proceeds from sale of available-for-sale securities                         73,100 94,300 111,700
Net cash used in investing activities                         (810,377) (750,952) (796,921)
Cash Flows From Financing Activities:                              
Issuance of common stock                             94,633
Redemption of Series B Preferred Stock                             (56,600)
Redemption of Series C Preferred Stock                             (15,300)
Proceeds from exercise of equity compensation plans                         372 955 5,176
Preferred stock dividends                             600
Excess tax benefit on stock-based compensation                           400 2,984
Payment in lieu of fractional shares                             4
Proceeds from employee stock purchase plan                         836 801 769
Net cash provided by financing activities                         472,154 703,932 740,670
Net Increase in Cash                         (177,690) 69,800 42,338
Cash and Cash Equivalents at Beginning of Period       368,163       298,363       256,025 368,163 298,363 256,025
Cash and Cash Equivalents at End of Period 190,473       368,163       298,363       190,473 368,163 298,363
Parent Company [Member]                              
Cash Flows From Operating Activities:                              
Net Income                         100,232 97,707 84,167
Adjustments to reconcile net income to net cash provided by operating activities:                              
Equity in undistributed income of subsidiary                         (108,941) (103,374) (87,557)
Net tax benefits from stock compensation                         460    
Excess tax benefit on stock-based compensation                           (400) (2,984)
Increase in other assets                         (1,379) (1,491) (785)
(Decrease) increase in other liabilities                         (189) 3,186 (121)
Net cash (used in) operating activities                         (9,817) (4,372) (7,280)
Cash Flows From Investing Activities:                              
Proceeds from sale of available-for-sale securities                           135 84
Investment in subsidiary (net)                         (460) (124,636) (419)
Net cash used in investing activities                         (460) (124,501) (335)
Cash Flows From Financing Activities:                              
Issuance of common stock                             94,633
Issuance in long-term borrowings                         391 147,586  
Redemption of Series B Preferred Stock                             (56,600)
Redemption of Series C Preferred Stock                             (15,300)
Decrease in long-term borrowings                             (9,300)
Proceeds from exercise of equity compensation plans                         372 955 5,176
Preferred stock dividends                             (600)
Excess tax benefit on stock-based compensation                           400 2,984
Payment in lieu of fractional shares                             (4)
Proceeds from employee stock purchase plan                         836 801 769
Net cash provided by financing activities                         1,599 149,742 21,758
Net Increase in Cash                         (8,678) 20,869 14,143
Cash and Cash Equivalents at Beginning of Period       $ 86,561       $ 65,692       $ 51,549 86,561 65,692 51,549
Cash and Cash Equivalents at End of Period $ 77,883       $ 86,561       $ 65,692       $ 77,883 $ 86,561 $ 65,692