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Securities - Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Available for sale |  |
Amortized Cost | $ 1,162,976 | $ 1,153,611
Gross Unrealized Gains | 462 | 16,800
Gross Unrealized Losses | (122,418) | (9,599)
Fair Value | 1,041,020 | 1,160,812
Held to maturity |  |
Amortized Cost | 2,052,772 | 1,552,443
Gross Unrealized Gains | 456 | 20,954
Gross Unrealized Losses | (299,014) | (13,406)
Fair Value | 1,754,214 | 1,559,991
U.S. Treasury and federal agencies |  |
Available for sale |  |
Amortized Cost | 294,793 | 118,595
Gross Unrealized Gains | 0 | 82
Gross Unrealized Losses | (19,617) | (1,698)
Fair Value | 275,176 | 116,979
Held to maturity |  |
Amortized Cost | 295,386 | 195,429
Gross Unrealized Gains | 0 | 12
Gross Unrealized Losses | (34,138) | (1,215)
Fair Value | 261,248 | 194,226
State and municipal |  |
Available for sale |  |
Amortized Cost | 507,128 | 632,652
Gross Unrealized Gains | 256 | 12,802
Gross Unrealized Losses | (69,217) | (5,708)
Fair Value | 438,167 | 639,746
Held to maturity |  |
Amortized Cost | 1,135,751 | 862,461
Gross Unrealized Gains | 456 | 20,719
Gross Unrealized Losses | (184,215) | (4,263)
Fair Value | 951,992 | 878,917
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Amortized Cost | 41,329 | 60,600
Gross Unrealized Gains | 0 | 989
Gross Unrealized Losses | (1,043) | (12)
Fair Value | 40,286 | 61,577
Held to maturity |  |
Amortized Cost | 59,694 | 48,482
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (6,160) | (1,020)
Fair Value | 53,534 | 47,465
Federal agency mortgage-backed pools |  |
Available for sale |  |
Amortized Cost | 235,337 | 257,185
Gross Unrealized Gains | 8 | 1,914
Gross Unrealized Losses | (24,860) | (1,408)
Fair Value | 210,485 | 257,691
Held to maturity |  |
Amortized Cost | 360,446 | 247,937
Gross Unrealized Gains | 0 | 209
Gross Unrealized Losses | (46,620) | (4,010)
Fair Value | 313,826 | 244,136
Private labeled mortgage-backed pools |  |
Available for sale |  |
Amortized Cost |  | 0
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Fair Value |  | 0
Held to maturity |  |
Amortized Cost | 37,101 | 40,447
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,346) | (442)
Fair Value | 32,755 | 40,005
Corporate notes |  |
Available for sale |  |
Amortized Cost | 84,389 | 84,579
Gross Unrealized Gains | 198 | 1,013
Gross Unrealized Losses | (7,681) | (773)
Fair Value | 76,906 | 84,819
Held to maturity |  |
Amortized Cost | 164,394 | 157,687
Gross Unrealized Gains | 0 | 11
Gross Unrealized Losses | (23,535) | (2,456)
Fair Value | $ 140,859 | $ 155,242

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