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Securities - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | $ 1,440,831 | $ 1,498,626
Unrealized Gains | 3,060 | 3,989
Unrealized Losses | (218,672) | (172,134)
Fair Value | 1,225,219 | 1,330,481
U.S. Government agencies |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 104,753 | 110,226
Unrealized Gains | 4 | 24
Unrealized Losses | (14,824) | (11,777)
Fair Value | 89,933 | 98,473
Mortgage Backed Securities - residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 669,417 | 711,131
Unrealized Gains | 2 | 133
Unrealized Losses | (112,729) | (91,016)
Fair Value | 556,690 | 620,248
Mortgage Backed Securities - commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 7,958 | 10,103
Unrealized Losses | (674) | (426)
Fair Value | 7,284 | 9,677
Collateralized Mortgage Obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 214,507 | 228,344
Unrealized Gains |  | 60
Unrealized Losses | (33,551) | (24,919)
Fair Value | 180,956 | 203,485
State and municipal obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 402,144 | 396,522
Unrealized Gains | 30 | 745
Unrealized Losses | (49,621) | (37,114)
Fair Value | 352,553 | 360,153
Municipal taxable |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 39,875 | 39,321
Unrealized Gains |  | 41
Unrealized Losses | (7,247) | (6,847)
Fair Value | 32,628 | 32,515
U.S. Treasury |  |
Amortized cost and fair value of investments classified as available for sale |  |
Amortized Cost | 2,177 | 2,979
Unrealized Losses | (26) | (35)
Fair Value | 2,151 | 2,944
Collateralized debt obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
Unrealized Gains | 3,024 | 2,986
Fair Value | $ 3,024 | $ 2,986

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