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Parent Company Financial Information (Condensed Statements of Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Income |  |  |  |  |  |  |  |  |  |  |
Deposits in banks |  |  |  |  |  |  |  |  | $ 216 | $ 109 | $ 179
Expense |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  | 150,282 | 149,410 | 130,864
Other borrowings |  |  |  |  |  |  |  |  | 545 | 553 | 593
Other expense |  |  |  |  |  |  |  |  | 28,362 | 30,521 | 27,045
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries | $ 43,035 | $ 39,608 | $ 36,650 | $ 30,488 | $ 37,338 | $ 37,295 | $ 31,799 | $ 35,188 | 149,781 | 141,620 | 117,785
Provision for income taxes | 12,317 | 12,124 | 11,245 | 9,229 | 10,598 | 11,515 | 9,853 | 10,827 | 44,915 | 42,793 | 36,211
Net income | $ 30,718 | $ 27,484 | $ 25,405 | $ 21,259 | $ 26,740 | $ 25,780 | $ 21,946 | $ 24,361 | 104,866 | 98,827 | 81,574
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |
Income |  |  |  |  |  |  |  |  |  |  |
Dividend from banking subsidiaries |  |  |  |  |  |  |  |  | 83,500 | 67,000 | 16,200
Deposits in banks |  |  |  |  |  |  |  |  | 4 | 5 | 25
Other income |  |  |  |  |  |  |  |  | 8 | 92 | 10
Total Income |  |  |  |  |  |  |  |  | 83,512 | 67,097 | 16,235
Expense |  |  |  |  |  |  |  |  |  |  |
Compensation and employee benefits |  |  |  |  |  |  |  |  | 543 | 618 | 530
Other borrowings |  |  |  |  |  |  |  |  | 0 | 5 | 83
Other expense |  |  |  |  |  |  |  |  | 1,608 | 1,368 | 1,433
Total Expenses |  |  |  |  |  |  |  |  | 2,151 | 1,991 | 2,046
Income before income tax benefit and equity in undistributed (excess distributed) earnings of subsidiaries |  |  |  |  |  |  |  |  | 81,361 | 65,106 | 14,189
Provision for income taxes |  |  |  |  |  |  |  |  | (748) | (663) | (704)
Income before equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 82,109 | 65,769 | 14,893
Equity in undistributed earnings of subsidiaries |  |  |  |  |  |  |  |  | 22,757 | 33,058 | 66,681
Net income |  |  |  |  |  |  |  |  | $ 104,866 | $ 98,827 | $ 81,574

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