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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
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,791,852 $ 1,600,984
Securities Available for Sale, Gross Unrealized Gains 43,468 7,580
Securities Available for Sale, Gross Unrealized (Losses) (1,541) (6,160)
Securities Available for Sale, Estimated Fair Value 1,833,779 1,602,404
Securities Held to Maturity, Amortized Cost 704,276 738,099
Securities Held to Maturity, Gross Unrealized Gains 27,212 9,274
Securities Held to Maturity, Gross Unrealized (Losses) (47) (1,171)
Securities Held to Maturity, Estimated Fair Value 731,441 746,202
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 21,704 22,965
Securities Available for Sale, Gross Unrealized Gains 78 69
Securities Available for Sale, Gross Unrealized (Losses) (592) (707)
Securities Available for Sale, Estimated Fair Value 21,190 22,327
Securities Held to Maturity, Amortized Cost 0 3,781
Securities Held to Maturity, Gross Unrealized Gains 0 220
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 4,001
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 23,084 24,952
Securities Available for Sale, Gross Unrealized Gains 488 513
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Securities Available for Sale, Estimated Fair Value 23,572 25,465
Securities Held to Maturity, Amortized Cost 31,758 31,781
Securities Held to Maturity, Gross Unrealized Gains 383 434
Securities Held to Maturity, Gross Unrealized (Losses) (41) (53)
Securities Held to Maturity, Estimated Fair Value 32,100 32,162
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 70,106 69,196
Securities Available for Sale, Gross Unrealized Gains 1,868 425
Securities Available for Sale, Gross Unrealized (Losses) (3) (369)
Securities Available for Sale, Estimated Fair Value 71,971 69,252
Securities Held to Maturity, Amortized Cost 10,492 10,820
Securities Held to Maturity, Gross Unrealized Gains 501 266
Securities Held to Maturity, Gross Unrealized (Losses) 0 (10)
Securities Held to Maturity, Estimated Fair Value 10,993 11,076
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 949,400 714,350
Securities Available for Sale, Gross Unrealized Gains 18,854 2,171
Securities Available for Sale, Gross Unrealized (Losses) (925) (3,165)
Securities Available for Sale, Estimated Fair Value 967,329 713,356
Securities Held to Maturity, Amortized Cost 91,971 96,631
Securities Held to Maturity, Gross Unrealized Gains 1,565 286
Securities Held to Maturity, Gross Unrealized (Losses) 0 (370)
Securities Held to Maturity, Estimated Fair Value 93,536 96,547
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 615,004 656,162
Securities Available for Sale, Gross Unrealized Gains 19,071 3,777
Securities Available for Sale, Gross Unrealized (Losses) 0 (1,713)
Securities Available for Sale, Estimated Fair Value 634,075 658,226
Securities Held to Maturity, Amortized Cost 463,175 485,324
Securities Held to Maturity, Gross Unrealized Gains 21,848 7,026
Securities Held to Maturity, Gross Unrealized (Losses) 0 (656)
Securities Held to Maturity, Estimated Fair Value 485,023 491,694
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 112,554 113,359
Securities Available for Sale, Gross Unrealized Gains 3,109 625
Securities Available for Sale, Gross Unrealized (Losses) (21) (206)
Securities Available for Sale, Estimated Fair Value 115,642 113,778
Securities Held to Maturity, Amortized Cost 106,880 109,762
Securities Held to Maturity, Gross Unrealized Gains 2,915 1,042
Securities Held to Maturity, Gross Unrealized (Losses) (6) (82)
Securities Held to Maturity, Estimated Fair Value $ 109,789 $ 110,722