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Securities - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 1,386,111 | $ 1,412,498
Unrealized Gains | 3,656 | 4,484
Unrealized Losses | (171,480) | (157,845)
Fair Value | 1,218,287 | 1,259,137
U.S. Government agencies |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 100,710 | 102,978
Unrealized Gains | 3 | 4
Unrealized Losses | (12,599) | (11,542)
Fair Value | 88,114 | 91,440
Mortgage Backed Securities - residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 638,535 | 653,507
Unrealized Gains | 9 | 53
Unrealized Losses | (92,745) | (83,675)
Fair Value | 545,799 | 569,885
Mortgage Backed Securities - commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 7,880 | 7,919
Unrealized Losses | (483) | (436)
Fair Value | 7,397 | 7,483
Collateralized mortgage obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 204,572 | 209,398
Unrealized Gains |  | 6
Unrealized Losses | (29,145) | (28,575)
Fair Value | 175,427 | 180,829
State and municipal obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 393,628 | 397,413
Unrealized Gains | 756 | 1,407
Unrealized Losses | (30,635) | (28,009)
Fair Value | 363,749 | 370,811
Municipal taxable |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 39,869 | 39,872
Unrealized Gains |  | 12
Unrealized Losses | (5,868) | (5,599)
Fair Value | 34,001 | 34,285
U.S. Treasury |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 917 | 1,411
Unrealized Losses | (5) | (9)
Fair Value | 912 | 1,402
Collateralized debt obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 2,888 | 3,002
Fair Value | $ 2,888 | $ 3,002

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