XML 61 R49.htm IDEA: XBRL DOCUMENT v3.24.1.u1
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, 2024
Dec. 31, 2023
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost $ 1,900,980 $ 1,959,007
Securities Available for Sale, Gross Unrealized Gains 28 37
Securities Available for Sale, Gross Unrealized (Losses) (198,709) (196,166)
Debt Securities, Available-for-sale 1,702,299 1,762,878
Securities Held to Maturity, Amortized Cost 1,415,025 1,426,279
Securities Held to Maturity, Gross Unrealized Gains 59 51
Securities Held to Maturity, Gross Unrealized (Losses) (82,070) (70,826)
Securities Held to Maturity, Estimated Fair Value 1,333,014 1,355,504
U.S. Treasury Securities [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 396,289 396,179
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (23,865) (23,811)
Debt Securities, Available-for-sale 372,424 372,368
Securities Held to Maturity, Amortized Cost 29,261 29,068
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (515) (26)
Securities Held to Maturity, Estimated Fair Value 28,746 29,042
U.S. Government Agency Obligations [Member]    
Schedule of Available For Sale and Held to Maturity Securities [Line Items]    
Securities Available for Sale, Amortized Cost 6,017 6,207
Securities Available for Sale, Gross Unrealized Gains 0 1
Securities Available for Sale, Gross Unrealized (Losses) (423) (416)
Debt Securities, Available-for-sale 5,594 5,792
Securities Held to Maturity, Amortized Cost 0 0
Securities Held to Maturity, Gross Unrealized Gains 0 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 0 0
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) 0 0
Debt Securities, Available-for-sale 0 0
Securities Held to Maturity, Amortized Cost 340 340
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) 0 0
Securities Held to Maturity, Estimated Fair Value 340 340
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 25,343 25,744
Securities Available for Sale, Gross Unrealized Gains 6 4
Securities Available for Sale, Gross Unrealized (Losses) (3,117) (2,613)
Debt Securities, Available-for-sale 22,232 23,135
Securities Held to Maturity, Amortized Cost 18,387 13,005
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (750) (497)
Securities Held to Maturity, Estimated Fair Value 17,637 12,508
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 1,293,149 1,338,256
Securities Available for Sale, Gross Unrealized Gains 22 32
Securities Available for Sale, Gross Unrealized (Losses) (163,650) (161,490)
Debt Securities, Available-for-sale 1,129,521 1,176,798
Securities Held to Maturity, Amortized Cost 461,457 469,593
Securities Held to Maturity, Gross Unrealized Gains 46 0
Securities Held to Maturity, Gross Unrealized (Losses) (21,935) (18,205)
Securities Held to Maturity, Estimated Fair Value 439,568 451,388
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 85,317 92,076
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (6,218) (6,002)
Debt Securities, Available-for-sale 79,099 86,074
Securities Held to Maturity, Amortized Cost 146,447 154,466
Securities Held to Maturity, Gross Unrealized Gains 0 0
Securities Held to Maturity, Gross Unrealized (Losses) (10,731) (10,113)
Securities Held to Maturity, Estimated Fair Value 135,716 144,353
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 94,865 100,545
Securities Available for Sale, Gross Unrealized Gains 0 0
Securities Available for Sale, Gross Unrealized (Losses) (1,436) (1,834)
Debt Securities, Available-for-sale 93,429 98,711
Securities Held to Maturity, Amortized Cost 759,133 759,807
Securities Held to Maturity, Gross Unrealized Gains 13 51
Securities Held to Maturity, Gross Unrealized (Losses) (48,139) (41,985)
Securities Held to Maturity, Estimated Fair Value $ 711,007 $ 717,873