Investment Securities (Tables)
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3 Months Ended |
Mar. 31, 2020 |
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| 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 March 31, 2020 and December 31, 2019: | | | | | | | | | | | | | | | | | | | | | | | | | March 31, 2020 | | | | | | | | (in thousands) | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | Available for sale: | | | | | | | | | | | | | U.S. Treasury and agencies | $ | 691,066 | | | $ | 59,446 | | | $ | — | | | $ | 750,512 | | | Obligations of states and political subdivisions | 242,262 | | | 10,172 | | | (15) | | | 252,419 | | Residential mortgage-backed securities and collateralized mortgage obligations | 1,824,819 | | | 63,032 | | | (307) | | | 1,887,544 | | | | | | | | | | | Total available for sale securities | $ | 2,758,147 | | | $ | 132,650 | | | $ | (322) | | | $ | 2,890,475 | | | Held to maturity: | | | | | | | | | | | | | | | | Residential mortgage-backed securities and collateralized mortgage obligations | $ | 3,200 | | | $ | 865 | | | $ | — | | | $ | 4,065 | | | | | | | | | | | Total held to maturity securities | $ | 3,200 | | | $ | 865 | | | $ | — | | | $ | 4,065 | |
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| December 31, 2019 | | | | | | | (in thousands) | Amortized Cost | | Unrealized Gains | | Unrealized Losses | | Fair Value | | Available for sale: | | | | | | | | | U.S. Treasury and agencies | $ | 642,009 | | | $ | 5,919 | | | $ | (4,324) | | | $ | 643,604 | | | Obligations of states and political subdivisions | 251,531 | | | 9,600 | | | (37) | | | 261,094 | | Residential mortgage-backed securities and collateralized mortgage obligations | 1,896,708 | | | 18,962 | | | (5,686) | | | 1,909,984 | | | | | | | | | | | Total available for sale securities | $ | 2,790,248 | | | $ | 34,481 | | | $ | (10,047) | | | $ | 2,814,682 | | | Held to maturity: | | | | | | | | | | | | | | | | Residential mortgage-backed securities and collateralized mortgage obligations | $ | 3,260 | | | $ | 1,003 | | | $ | — | | | $ | 4,263 | | | | | | | | | | | Total held to maturity securities | $ | 3,260 | | | $ | 1,003 | | | $ | — | | | $ | 4,263 | |
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| Schedule Of Fair Value And Unrealized Losses Of Securities |
Debt securities that were in an unrealized loss position as of March 31, 2020 and December 31, 2019 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| March 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: | | | | | | | | | | | | | | | | | | | | | | | | Obligations of states and political subdivisions | $ | 3,843 | | | $ | 10 | | | $ | 774 | | | $ | 5 | | | $ | 4,617 | | | $ | 15 | | Residential mortgage-backed securities and collateralized mortgage obligations | — | | | — | | | 22,719 | | | 307 | | | 22,719 | | | 307 | | | Total | $ | 3,843 | | | $ | 10 | | | $ | 23,493 | | | $ | 312 | | | $ | 27,336 | | | $ | 322 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| December 31, 2019 | | | | | | | | | | | | 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 | $ | 313,169 | | | $ | 4,324 | | | $ | — | | | $ | — | | | $ | 313,169 | | | $ | 4,324 | | Obligations of states and political subdivisions | 4,611 | | | 30 | | | 1,906 | | | 7 | | | 6,517 | | | 37 | | Residential mortgage-backed securities and collateralized mortgage obligations | 288,866 | | | 1,628 | | | 402,802 | | | 4,058 | | | 691,668 | | | 5,686 | | | | | | | | | | | | | | | Total | $ | 606,646 | | | $ | 5,982 | | | $ | 404,708 | | | $ | 4,065 | | | $ | 1,011,354 | | | $ | 10,047 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Schedule Of Maturities Of Investment Securities |
The following table presents the contractual maturities of debt securities at March 31, 2020: | | | | | | | | | | | | | | | | | | | | | | | |
| Available For Sale | | | | Held To Maturity | | | (in thousands) | Amortized Cost | | Fair Value | | Amortized Cost | | Fair Value | | Due within one year | $ | 25,308 | | | $ | 25,479 | | | $ | — | | | $ | — | | | Due after one year through five years | 53,243 | | | 54,215 | | | 3 | | | 3 | | | Due after five years through ten years | 851,403 | | | 908,128 | | | 11 | | | 12 | | | Due after ten years | 1,828,193 | | | 1,902,653 | | | 3,186 | | | 4,050 | | | Total securities | $ | 2,758,147 | | | $ | 2,890,475 | | | $ | 3,200 | | | $ | 4,065 | |
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| Gain (Loss) on Securities [Table Text Block] |
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| Investment Securities Pledged To Secure Borrowings And Public Deposits |
The following table presents, as of March 31, 2020, 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 | $ | 283,422 | | | $ | 292,225 | | | Other securities pledged principally to secure repurchase agreements | 552,246 | | | 580,377 | | | Total pledged securities | $ | 835,668 | | | $ | 872,602 | |
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