XML 73 R59.htm IDEA: XBRL DOCUMENT v3.22.0.1
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
Dec. 31, 2021
Dec. 31, 2020
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 3,256,289 $ 1,959,773
Securities Available for Sale, Gross Unrealized Gains 13,509 33,889
Securities Available for Sale, Gross Unrealized (Losses) (30,921) (1,847)
Securities Available for Sale, Estimated Fair Value 3,238,877 1,991,815
Securities Held to Maturity, Amortized Cost 342,537 538,072
Securities Held to Maturity, Gross Unrealized Gains 11,011 25,101
Securities Held to Maturity, Gross Unrealized (Losses) (37) (58)
Securities Held to Maturity, Estimated Fair Value 353,511 563,115
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 349,562  
Securities Available for Sale, Gross Unrealized Gains 16  
Securities Available for Sale, Gross Unrealized (Losses) (4,938)  
Securities Available for Sale, Estimated Fair Value 344,640  
Securities Held to Maturity, Amortized Cost 0  
Securities Held to Maturity, Gross Unrealized Gains 0  
Securities Held to Maturity, Gross Unrealized (Losses) 0  
Securities Held to Maturity, Estimated Fair Value 0  
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 14,044 18,378
Securities Available for Sale, Gross Unrealized Gains 20 144
Securities Available for Sale, Gross Unrealized (Losses) (337) (481)
Securities Available for Sale, Estimated Fair Value 13,727 18,041
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0  
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 0 0
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 5,134 5,198
Securities Available for Sale, Gross Unrealized Gains 580 637
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Securities Available for Sale, Estimated Fair Value 5,714 5,835
Securities Held to Maturity, Amortized Cost 7,328 26,584
Securities Held to Maturity, Gross Unrealized Gains 64 258
Securities Held to Maturity, Gross Unrealized (Losses) (3) (3)
Securities Held to Maturity, Estimated Fair Value 7,389 26,839
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 38,942 55,193
Securities Available for Sale, Gross Unrealized Gains 665 1,672
Securities Available for Sale, Gross Unrealized (Losses) (34) (3)
Securities Available for Sale, Estimated Fair Value 39,573 56,862
Securities Held to Maturity, Amortized Cost 5,005 7,598
Securities Held to Maturity, Gross Unrealized Gains 187 382
Securities Held to Maturity, Gross Unrealized (Losses) (3) 0
Securities Held to Maturity, Estimated Fair Value 5,189 7,980
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 2,230,498 1,421,861
Securities Available for Sale, Gross Unrealized Gains 8,945 20,768
Securities Available for Sale, Gross Unrealized (Losses) (21,014) (1,308)
Securities Available for Sale, Estimated Fair Value 2,218,429 1,441,321
Securities Held to Maturity, Amortized Cost 43,444 67,944
Securities Held to Maturity, Gross Unrealized Gains 962 2,397
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 44,406 70,341
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 193,908 409,883
Securities Available for Sale, Gross Unrealized Gains 2,879 9,600
Securities Available for Sale, Gross Unrealized (Losses) (97) (46)
Securities Available for Sale, Estimated Fair Value 196,690 419,437
Securities Held to Maturity, Amortized Cost 241,934 360,361
Securities Held to Maturity, Gross Unrealized Gains 9,015 19,678
Securities Held to Maturity, Gross Unrealized (Losses) (31) (55)
Securities Held to Maturity, Estimated Fair Value 250,918 379,984
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 424,201 49,260
Securities Available for Sale, Gross Unrealized Gains 404 1,068
Securities Available for Sale, Gross Unrealized (Losses) (4,501) (9)
Securities Available for Sale, Estimated Fair Value 420,104 50,319
Securities Held to Maturity, Amortized Cost 44,826 75,585
Securities Held to Maturity, Gross Unrealized Gains 783 2,386
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value $ 45,609 $ 77,971