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Securities Securities - Unrealized Losses (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 17,547 $ 20,187
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 1,017,346 907,810
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 9,021 18,219
Investments with an Unrealized Loss of 12 months or longer, Fair Value 361,724 98,377
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 8,526 1,968
Total Investments with an Unrealized Loss, Fair Value 1,379,070 1,006,187
US Treasury Securities    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 60 0
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 29,948 0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 60 0
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0 0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0 0
Total Investments with an Unrealized Loss, Fair Value 29,948 0
U.S. Government Agency Securities    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 1,766 537
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 173,677 0
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 1,766 0
Investments with an Unrealized Loss of 12 months or longer, Fair Value 0 20,820
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 0 537
Total Investments with an Unrealized Loss, Fair Value 173,677 20,820
Mortgage-backed Agency Securities    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 12,124 15,686
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 607,408 801,213
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 5,042 15,073
Investments with an Unrealized Loss of 12 months or longer, Fair Value 285,561 43,148
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 7,082 613
Total Investments with an Unrealized Loss, Fair Value 892,969 844,361
State and Municipal Securities    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 2,634 3,069
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 115,403 87,277
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 1,408 3,068
Investments with an Unrealized Loss of 12 months or longer, Fair Value 50,083 312
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 1,226 1
Total Investments with an Unrealized Loss, Fair Value 165,486 87,589
Asset-backed Securities    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 316 849
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 68,742 14,510
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 198 32
Investments with an Unrealized Loss of 12 months or longer, Fair Value 14,136 34,097
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 118 817
Total Investments with an Unrealized Loss, Fair Value 82,878 48,607
Corporate Notes    
Schedule of Investment Securities [Line Items]    
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss 647 46
Investment securities, continuous unrealized loss position [Abstract]    
Investments with an Unrealized Loss of less than 12 months, Fair Value 22,168 4,810
Investments with an Unrealized Loss of less than 12 months, Unrealized Losses 547 46
Investments with an Unrealized Loss of 12 months or longer, Fair Value 11,944 0
Investments with an Unrealized Loss of 12 months or longer, Unrealized Losses 100 0
Total Investments with an Unrealized Loss, Fair Value $ 34,112 $ 4,810