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Securities (Schedule of Information Regarding Securities with Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS and HTM | $ 1,184,497 | $ 555,070
Unrealized Losses, AFS and HTM | 14,342 | 2,348
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 158,402 | 7,003
Unrealized Losses, AFS and HTM | 3,048 | 332
Total |  |
Fair Value, AFS and HTM | 1,342,899 | 562,073
Unrealized Losses, AFS and HTM | 17,390 | 2,680
Government-sponsored enterprise securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 49,238 | 29,812
Unrealized Losses, AFS | 776 | 181
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 19,370 | 0
Unrealized Losses, AFS | 630 | 0
Total |  |
Fair Value, AFS | 68,608 | 29,812
Unrealized Losses, AFS | 1,406 | 181
Mortgage-backed securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS and HTM | 1,010,196 | 497,992
Unrealized Losses, AFS and HTM | 12,219 | 1,957
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 124,643 | 6,168
Unrealized Losses, AFS and HTM | 2,064 | 167
Total |  |
Fair Value, AFS and HTM | 1,134,839 | 504,160
Unrealized Losses, AFS and HTM | 14,283 | 2,124
Corporate bonds |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 0 | 3,956
Unrealized Losses, AFS | 0 | 45
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 4,871 | 835
Unrealized Losses, AFS | 129 | 165
Total |  |
Fair Value, AFS | 4,871 | 4,791
Unrealized Losses, AFS | 129 | 210
State and local governments |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, HTM | 125,063 | 23,310
Unrealized Losses, HTM | 1,347 | 165
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, HTM | 9,518 | 0
Unrealized Losses, HTM | 225 | 0
Total |  |
Fair Value, HTM | 134,581 | 23,310
Unrealized Losses, HTM | $ 1,572 | $ 165

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