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Securities - Fair Value of Securities (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available for sale |  |
Total amortized cost | $ 1,153,611 | $ 1,090,363
Gross Unrealized Gains | 16,800 | 43,985
Gross Unrealized Losses | (9,599) | (323)
Fair Value | 1,160,812 | 1,134,025
Held to maturity |  |
Amortized Cost | 1,552,443 | 168,676
Gross Unrealized Gains | 20,954 | 11,314
Gross Unrealized Losses | (13,406) | 0
Fair Value | 1,559,991 | 179,990
U.S. Treasury and federal agencies |  |
Available for sale |  |
Total amortized cost | 118,595 | 19,750
Gross Unrealized Gains | 82 | 0
Gross Unrealized Losses | (1,698) | (35)
Fair Value | 116,979 | 19,715
Held to maturity |  |
Amortized Cost | 195,429 |
Gross Unrealized Gains | 12 |
Gross Unrealized Losses | (1,215) |
Fair Value | 194,226 |
State and municipal |  |
Available for sale |  |
Total amortized cost | 632,652 | 803,100
Gross Unrealized Gains | 12,802 | 35,014
Gross Unrealized Losses | (5,708) | (271)
Fair Value | 639,746 | 837,843
Held to maturity |  |
Amortized Cost | 862,461 | 157,421
Gross Unrealized Gains | 20,719 | 11,035
Gross Unrealized Losses | (4,263) | 0
Fair Value | 878,917 | 168,456
Federal agency collateralized mortgage obligations |  |
Available for sale |  |
Total amortized cost | 60,600 | 144,022
Gross Unrealized Gains | 989 | 3,448
Gross Unrealized Losses | (12) | (17)
Fair Value | 61,577 | 147,453
Held to maturity |  |
Amortized Cost | 48,482 | 2,661
Gross Unrealized Gains | 3 | 36
Gross Unrealized Losses | (1,020) | 0
Fair Value | 47,465 | 2,697
Federal agency mortgage–backed pools |  |
Available for sale |  |
Total amortized cost | 225,329 | 114,484
Gross Unrealized Gains | 1,777 | 4,315
Gross Unrealized Losses | (1,032) | 0
Fair Value | 226,074 | 118,799
Held to maturity |  |
Amortized Cost | 188,426 | 8,594
Gross Unrealized Gains | 151 | 243
Gross Unrealized Losses | (2,612) | 0
Fair Value | 185,965 | 8,837
Private labeled mortgage–backed pools |  |
Available for sale |  |
Total amortized cost | 31,856 |
Gross Unrealized Gains | 137 |
Gross Unrealized Losses | (376) |
Fair Value | 31,617 | 0
Held to maturity |  |
Amortized Cost | 99,958 | 0
Gross Unrealized Gains | 58 |
Gross Unrealized Losses | (1,840) |
Fair Value | 98,176 | 0
Corporate notes |  |
Available for sale |  |
Total amortized cost | 84,579 | 9,007
Gross Unrealized Gains | 1,013 | 1,208
Gross Unrealized Losses | (773) | 0
Fair Value | 84,819 | $ 10,215
Held to maturity |  |
Amortized Cost | 157,687 |
Gross Unrealized Gains | 11 |
Gross Unrealized Losses | (2,456) |
Fair Value | $ 155,242 |

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