Investment Securities (Tables)
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12 Months Ended |
Dec. 31, 2021 |
Dec. 31, 2019 |
| Investments, Debt and Equity Securities [Abstract] |
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| Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities |
The following tables present the amortized cost, unrealized gains, unrealized losses and approximate fair values of debt securities at December 31, 2021 and 2020:
December 31, 2021 | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | Available for sale: | | | | | | | | | U.S. Treasury and agencies | $ | 894,969 | | | $ | 27,279 | | | $ | (4,195) | | | $ | 918,053 | | | Obligations of states and political subdivisions | 320,338 | | | 11,734 | | | (1,288) | | | 330,784 | | | Residential mortgage-backed securities and collateralized mortgage obligations | 2,649,048 | | | 19,093 | | | (46,543) | | | 2,621,598 | | | Total available for sale securities | $ | 3,864,355 | | | $ | 58,106 | | | $ | (52,026) | | | $ | 3,870,435 | | | | | | | | | | | Held to maturity: | | | | | | | | | | | | | | | | | Residential mortgage-backed securities and collateralized mortgage obligations | $ | 2,744 | | | $ | 770 | | | $ | — | | | $ | 3,514 | | | Total held to maturity securities | $ | 2,744 | | | $ | 770 | | | $ | — | | | $ | 3,514 | |
December 31, 2020 | | | | | | | | | | | | | | | | | | | | | | | | | (in thousands) | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | Available for sale: | | | | | | | | | U.S. Treasury and agencies | $ | 698,243 | | | $ | 64,271 | | | $ | (312) | | | $ | 762,202 | | | Obligations of states and political subdivisions | 263,546 | | | 15,996 | | | (31) | | | 279,511 | | | Residential mortgage-backed securities and collateralized mortgage obligations | 1,839,711 | | | 51,583 | | | (449) | | | 1,890,845 | | | Total available for sale securities | $ | 2,801,500 | | | $ | 131,850 | | | $ | (792) | | | $ | 2,932,558 | | | | | | | | | | | Held to maturity: | | | | | | | | | | | | | | | | | Residential mortgage-backed securities and collateralized mortgage obligations | $ | 3,034 | | | $ | 849 | | | $ | — | | | $ | 3,883 | | | Total held to maturity securities | $ | 3,034 | | | $ | 849 | | | $ | — | | | $ | 3,883 | |
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| Schedule Of Fair Value And Unrealized Losses Of Securities |
December 31, 2021 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Less than 12 Months | | 12 Months or Longer | | Total | | (in thousands) | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Available for sale: | | | | | | | | | | | | | U.S. Treasury and agencies | $ | 197,529 | | | $ | 2,749 | | | $ | 28,378 | | | $ | 1,446 | | | $ | 225,907 | | | $ | 4,195 | | | Obligations of states and political subdivisions | 75,200 | | | 1,153 | | | 2,162 | | | 135 | | | 77,362 | | | 1,288 | | | Residential mortgage-backed securities and collateralized mortgage obligations | 1,777,288 | | | 40,579 | | | 129,943 | | | 5,964 | | | 1,907,231 | | | 46,543 | | | Total temporarily impaired securities | $ | 2,050,017 | | | $ | 44,481 | | | $ | 160,483 | | | $ | 7,545 | | | $ | 2,210,500 | | | $ | 52,026 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
December 31, 2020 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Less than 12 Months | | 12 Months or Longer | | Total | | (in thousands) | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Fair Value | | Unrealized Losses | | Available for sale: | | | | | | | | | | | | | U.S. Treasury and agencies | $ | 29,493 | | | $ | 312 | | | $ | — | | | $ | — | | | $ | 29,493 | | | $ | 312 | | | Obligations of states and political subdivisions | 4,357 | | | 31 | | | — | | | — | | | 4,357 | | | 31 | | | Residential mortgage-backed securities and collateralized mortgage obligations | 215,165 | | | 449 | | | — | | | — | | | 215,165 | | | 449 | | | Total temporarily impaired securities | $ | 249,015 | | | $ | 792 | | | $ | — | | | $ | — | | | $ | 249,015 | | | $ | 792 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Schedule Of Maturities Of Investment Securities |
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The following table presents the contractual maturities of debt securities at December 31, 2021: | | | | | | | | | | | | | | | | | | | | | | | | | Available For Sale | | Held To Maturity | | (in thousands) | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | Due within one year | $ | 11,608 | | | $ | 11,749 | | | $ | — | | | $ | — | | | Due after one year through five years | 250,556 | | | 256,279 | | | 2 | | | 2 | | | Due after five years through ten years | 979,600 | | | 1,004,824 | | | 7 | | | 7 | | | Due after ten years | 2,622,591 | | | 2,597,583 | | | 2,735 | | | 3,505 | | | Total securities | $ | 3,864,355 | | | $ | 3,870,435 | | | $ | 2,744 | | | $ | 3,514 | |
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| Investment Securities Pledged To Secure Borrowings And Public Deposits |
The following table presents, as of December 31, 2021, investment securities which were pledged to secure borrowings, public deposits, and repurchase agreements as permitted or required by law: | | | | | | | | | | | | | (in thousands) | Amortized Cost | | Fair Value | | | | | | To state and local governments to secure public deposits | $ | 271,285 | | | $ | 276,094 | | | To secure repurchase agreements | 610,093 | | | 625,543 | | | Other securities pledged | 244,520 | | | 245,794 | | | Total pledged securities | $ | 1,125,898 | | | $ | 1,147,431 | |
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