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Securities - Available-for-Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Total $ 1,407,465 $ 1,408,996
Gross Unrealized Gains 996  
Gross Unrealized Losses 37,692  
Fair Value 1,370,769 1,391,862
Amortized Cost 1,408,360 1,409,996
Gross Unrealized Gains 996 2,263
Gross Unrealized Losses 37,692 19,484
Fair Value 1,371,664 1,392,775
Obligations of U.S. Government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Total 498,644  
Gross Unrealized Gains 7  
Gross Unrealized Losses 8,804  
Fair Value 489,847  
Amortized Cost   507,248
Gross Unrealized Gains   278
Gross Unrealized Losses   3,333
Fair Value   504,193
Obligations of U.S. states and political subdivisions    
Schedule of Available-for-sale Securities [Line Items]    
Total 91,623  
Gross Unrealized Gains 106  
Gross Unrealized Losses 1,381  
Fair Value 90,348  
Amortized Cost   91,659
Gross Unrealized Gains   281
Gross Unrealized Losses   421
Fair Value   91,519
U.S. Government agencies    
Schedule of Available-for-sale Securities [Line Items]    
Total 133,524  
Gross Unrealized Gains 461  
Gross Unrealized Losses 4,305  
Fair Value 129,680  
Amortized Cost   139,747
Gross Unrealized Gains   659
Gross Unrealized Losses   2,671
Fair Value   137,735
U.S. Government sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Total 681,110  
Gross Unrealized Gains 422  
Gross Unrealized Losses 22,877  
Fair Value 658,655  
Amortized Cost   667,767
Gross Unrealized Gains   1,045
Gross Unrealized Losses   12,634
Fair Value   656,178
Non-U.S. Government agencies or sponsored entities    
Schedule of Available-for-sale Securities [Line Items]    
Total 64  
Gross Unrealized Gains 0  
Gross Unrealized Losses 0  
Fair Value 64  
Amortized Cost   75
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Fair Value   75
U.S. corporate debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Total 2,500  
Gross Unrealized Gains 0  
Gross Unrealized Losses 325  
Fair Value 2,175  
Amortized Cost   2,500
Gross Unrealized Gains   0
Gross Unrealized Losses   338
Fair Value   2,162
Total debt securities    
Schedule of Available-for-sale Securities [Line Items]    
Total 592,767 601,407
Fair Value 582,370 597,874
Amortized Cost   1,408,996
Gross Unrealized Gains   2,263
Gross Unrealized Losses   19,397
Fair Value   1,391,862
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 895 1,000
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 87
Fair Value $ 895 $ 913