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Securities - Schedule of Fair Value of Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 628,431 | $ 634,615
Gross Unrealized Gains | 0 | 455
Gross Unrealized Losses | (93,112) | (87,819)
Fair Value | 535,319 | 547,251
Held to maturity |  |
Amortized Cost | 1,925,883 | 1,945,795
Gross Unrealized Gains | 543 | 1,185
Gross Unrealized Losses | (298,573) | (278,222)
Fair Value | 1,627,853 | 1,668,758
Allowance for Credit Losses | (158) | (157)
Net Carrying Amount | 1,925,725 | 1,945,638
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 71,943 | 72,938
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,017) | (8,561)
Fair Value | 62,926 | 64,377
Held to maturity |  |
Amortized Cost | 284,236 | 287,259
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (43,199) | (41,299)
Fair Value | 241,037 | 245,960
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 284,236 | 287,259
State and municipal |  |
Available for sale |  |
Amortized Cost | 352,738 | 353,299
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (53,483) | (49,269)
Fair Value | 299,255 | 304,030
Held to maturity |  |
Amortized Cost | 1,078,388 | 1,088,499
Gross Unrealized Gains | 543 | 1,185
Gross Unrealized Losses | (167,301) | (150,323)
Fair Value | 911,630 | 939,361
Allowance for Credit Losses | (21) | (20)
Net Carrying Amount | 1,078,367 | 1,088,479
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 3,819 | 3,931
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (369) | (351)
Fair Value | 3,450 | 3,580
Held to maturity |  |
Amortized Cost | 49,913 | 51,325
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (8,088) | (7,846)
Fair Value | 41,825 | 43,479
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 49,913 | 51,325
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 157,812 | 161,130
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (24,670) | (23,833)
Fair Value | 133,142 | 137,297
Held to maturity |  |
Amortized Cost | 319,181 | 323,649
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (50,329) | (48,621)
Fair Value | 268,852 | 275,028
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 319,181 | 323,649
Private labeled mortgage-backed pools |  |
Held to maturity |  |
Amortized Cost | 31,712 | 32,329
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,530) | (4,595)
Fair Value | 27,182 | 27,734
Allowance for Credit Losses | (7) | (7)
Net Carrying Amount | 31,705 | 32,322
Corporate notes |  |
Available for sale |  |
Amortized Cost | 42,119 | 43,317
Gross Unrealized Gains | 0 | 455
Gross Unrealized Losses | (5,573) | (5,805)
Fair Value | 36,546 | 37,967
Held to maturity |  |
Amortized Cost | 162,453 | 162,734
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (25,126) | (25,538)
Fair Value | 137,327 | 137,196
Allowance for Credit Losses | (130) | (130)
Net Carrying Amount | $ 162,323 | $ 162,604

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