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Securities Available for Sale and Held to Maturity - Amortized Cost and Estimated Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 2,035,484 $ 2,262,130
Securities Available for Sale, Gross Unrealized Gains 1,251 4,448
Securities Available for Sale, Gross Unrealized (Losses) (62,060) (27,943)
Securities Available for Sale, Estimated Fair Value 1,974,675 2,238,635
Securities Held to Maturity, Amortized Cost 985,845 1,056,486
Securities Held to Maturity, Gross Unrealized Gains 830 3,954
Securities Held to Maturity, Gross Unrealized (Losses) (32,037) (14,193)
Securities Held to Maturity, Estimated Fair Value 954,638 1,046,247
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 37,384 45,763
Securities Available for Sale, Gross Unrealized Gains 161 322
Securities Available for Sale, Gross Unrealized (Losses) (1,131) (800)
Securities Available for Sale, Estimated Fair Value 36,414 45,285
Securities Held to Maturity, Amortized Cost 3,714 3,692
Securities Held to Maturity, Gross Unrealized Gains 89 182
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 3,803 3,874
Obligations of States and Political Subdivisions [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 64,986 78,433
Securities Available for Sale, Gross Unrealized Gains 408 850
Securities Available for Sale, Gross Unrealized (Losses) (46) (54)
Securities Available for Sale, Estimated Fair Value 65,348 79,229
Securities Held to Maturity, Amortized Cost 42,458 46,039
Securities Held to Maturity, Gross Unrealized Gains 577 1,044
Securities Held to Maturity, Gross Unrealized (Losses) (101) (59)
Securities Held to Maturity, Estimated Fair Value 42,934 47,024
Residential Mortgage Pass-Through Securities Guaranteed by GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 62,747 66,634
Securities Available for Sale, Gross Unrealized Gains 124 215
Securities Available for Sale, Gross Unrealized (Losses) (2,626) (1,103)
Securities Available for Sale, Estimated Fair Value 60,245 65,746
Securities Held to Maturity, Amortized Cost 12,756 13,539
Securities Held to Maturity, Gross Unrealized Gains 39 207
Securities Held to Maturity, Gross Unrealized (Losses) (291) (73)
Securities Held to Maturity, Estimated Fair Value 12,504 13,673
Residential Mortgage Pass-Through Securities Issued by FNMA and FHLMC [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 753,124 824,872
Securities Available for Sale, Gross Unrealized Gains 192 827
Securities Available for Sale, Gross Unrealized (Losses) (25,882) (11,249)
Securities Available for Sale, Estimated Fair Value 727,434 814,450
Securities Held to Maturity, Amortized Cost 123,377 133,975
Securities Held to Maturity, Gross Unrealized Gains 22 210
Securities Held to Maturity, Gross Unrealized (Losses) (3,979) (1,559)
Securities Held to Maturity, Estimated Fair Value 119,420 132,626
Other Residential Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 925,705 1,028,176
Securities Available for Sale, Gross Unrealized Gains 166 1,808
Securities Available for Sale, Gross Unrealized (Losses) (28,220) (13,194)
Securities Available for Sale, Estimated Fair Value 897,651 1,016,790
Securities Held to Maturity, Amortized Cost 627,470 678,926
Securities Held to Maturity, Gross Unrealized Gains 40 1,209
Securities Held to Maturity, Gross Unrealized (Losses) (23,956) (11,065)
Securities Held to Maturity, Estimated Fair Value 603,554 669,070
Commercial Mortgage-Backed Securities Issued or Guaranteed by FNMA, FHLMC or GNMA [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 191,538 218,252
Securities Available for Sale, Gross Unrealized Gains 200 426
Securities Available for Sale, Gross Unrealized (Losses) (4,155) (1,543)
Securities Available for Sale, Estimated Fair Value 187,583 217,135
Securities Held to Maturity, Amortized Cost 176,070 180,315
Securities Held to Maturity, Gross Unrealized Gains 63 1,102
Securities Held to Maturity, Gross Unrealized (Losses) (3,710) (1,437)
Securities Held to Maturity, Estimated Fair Value $ 172,423 $ 179,980