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Segment Reporting (Details) - 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, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]                      
Net Interest Income $ 92,856 $ 89,844 $ 74,580 $ 73,028 $ 75,160 $ 73,681 $ 73,118 $ 72,707 $ 330,308 $ 294,666 $ 233,998
Provision for loan losses 5,328 5,705 889 3,641 2,181 5,328 2,118 2,067 15,563 11,694 12,697
Total noninterest income 25,528 24,977 25,624 25,893 24,455 28,542 31,026 29,578 102,022 113,601 110,685
Total noninterest expense 77,878 $ 78,759 $ 69,298 $ 71,740 69,912 $ 68,427 $ 71,020 $ 70,309 297,675 279,668 251,046
Income (loss) before income taxes                 119,092 116,905 80,940
Segment Assets                      
Segment Assets 9,810,739       8,247,079       9,810,739 8,247,079 7,694,754
Average Loans, Net of Unearned                      
Average Loans, Net of Unearned                 5,847,061 5,488,112 4,551,008
Community and Other Banking                      
Segment Reporting Information [Line Items]                      
Net Interest Income                 326,130 290,088 228,422
Provision for loan losses                 15,563 11,694 12,697
Total noninterest income                 77,837 74,145 65,414
Total noninterest expense                 264,929 237,198 201,063
Income (loss) before income taxes                 123,475 115,341 80,076
Segment Assets                      
Segment Assets 9,757,575       8,149,465       9,757,575 8,149,465 7,585,130
Average Loans, Net of Unearned                      
Average Loans, Net of Unearned                 5,810,308 5,418,169 4,466,528
Mortgage Banking                      
Segment Reporting Information [Line Items]                      
Net Interest Income                 4,178 4,578 5,576
Provision for loan losses                 0 0 0
Total noninterest income                 24,185 39,456 45,271
Total noninterest expense                 32,746 42,470 49,983
Income (loss) before income taxes                 (4,383) 1,564 864
Segment Assets                      
Segment Assets $ 53,164       $ 97,614       53,164 97,614 109,624
Average Loans, Net of Unearned                      
Average Loans, Net of Unearned                 $ 36,753 $ 69,943 $ 84,480