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Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Available for Sale, Fair Value |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 1,646,938 | $ 1,583,736
Debt Securities, Available-for-sale | 1,552,731 | 1,571,148
Held to Maturity, Fair Value |  |
Debt Securities, Held-to-maturity | 1,282,441 | 1,066,818
Held to Maturity, Fair Value, Total | 1,210,938 | 1,064,133
Available for Sale Securities and Held to Maturity Securities Amortized Cost | 2,929,379 |
Debt Securities, Available-for-sale and Held-to-maturity | 2,763,669 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost | 19,824 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value | 19,844 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Amortized Cost | 906,381 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after One Through Five Years, Fair Value | 861,443 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost | 988,746 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Fair Value | 917,549 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Amortized Cost | 1,014,428 |
Debt Securities, Available-for-sale and Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Ten Years, Fair Value | 964,833 |
U.S. government agency securities |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 68,071 |
Available for Sale, Amortized Cost, Due after five to ten years | 163,414 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 64,776 |
Available for Sale, Fair Value, Due after five to ten years | 151,159 |
Available for Sale, Fair Value, Due after ten years | 0 |
Debt Securities, Available-for-sale, Amortized Cost | 231,485 | 217,393
Debt Securities, Available-for-sale | 215,935 | 215,482
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 32,555 |
Held to Maturity, Amortized Cost, Due after five to ten years | 0 |
Held to Maturity, Amortized Cost, Due after ten years | 0 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 30,981 |
Held to Maturity, Fair Value, Due after five to ten years | 0 |
Held to Maturity, Fair Value, Due after ten years | 0 |
Debt Securities, Held-to-maturity | 32,555 | 32,987
Held to Maturity, Fair Value, Total | 30,981 | 32,546
Small Business Administration Pooled Securities [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 0 |
Available for Sale, Amortized Cost, Due after five to ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 68,455 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 0 |
Available for Sale, Fair Value, Due after five to ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 65,788 |
Debt Securities, Available-for-sale, Amortized Cost | 68,455 | 47,075
Debt Securities, Available-for-sale | 65,788 | 48,914
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 0 |
Held to Maturity, Amortized Cost, Due after five to ten years | 0 |
Held to Maturity, Amortized Cost, Due after ten years | 20,513 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 0 |
Held to Maturity, Fair Value, Due after five to ten years | 0 |
Held to Maturity, Fair Value, Due after ten years | 20,104 |
Debt Securities, Held-to-maturity | 20,513 | 21,023
Held to Maturity, Fair Value, Total | 20,104 | 21,756
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 19,824 |
Available for Sale, Amortized Cost, Due after one year to five years | 791,730 |
Available for Sale, Amortized Cost, Due after five to ten years | 552,353 |
Available for Sale, Amortized Cost, Due after ten years | 283,031 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 19,844 |
Available for Sale, Fair Value, Due after one year to five years | 751,212 |
Available for Sale, Fair Value, Due after five to ten years | 510,804 |
Available for Sale, Fair Value, Due after ten years | 270,871 |
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 114,651 |
Held to Maturity, Amortized Cost, Due after five to ten years | 436,393 |
Held to Maturity, Amortized Cost, Due after ten years | 731,397 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 110,231 |
Held to Maturity, Fair Value, Due after five to ten years | 406,745 |
Held to Maturity, Fair Value, Due after ten years | 693,962 |
Held to Maturity, Fair Value, Total | 1,210,938 |
Pooled trust preferred securities issued by banks and insurers |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 0 |
Available for Sale, Amortized Cost, Due after five to ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 1,199 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 0 |
Available for Sale, Fair Value, Due after five to ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 999 |
Debt Securities, Available-for-sale, Amortized Cost | 1,199 | 1,199
Debt Securities, Available-for-sale | 999 | 1,000
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 0 |
Available for Sale, Amortized Cost, Due after five to ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 489 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 0 |
Available for Sale, Fair Value, Due after five to ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 489 |
Debt Securities, Available-for-sale, Amortized Cost | 489 | 489
Debt Securities, Available-for-sale | 489 | 491
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 0 |
Held to Maturity, Amortized Cost, Due after five to ten years | 1,500 |
Held to Maturity, Amortized Cost, Due after ten years | 0 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 0 |
Held to Maturity, Fair Value, Due after five to ten years | 1,508 |
Held to Maturity, Fair Value, Due after ten years | 0 |
Debt Securities, Held-to-maturity | 1,500 | 1,500
Held to Maturity, Fair Value, Total | 1,508 | 1,508
US States and Political Subdivisions Debt Securities [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 192 |
Available for Sale, Amortized Cost, Due after five to ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 200 |
Available for Sale, Fair Value, Due after five to ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 0 |
Debt Securities, Available-for-sale, Amortized Cost | 192 | 192
Debt Securities, Available-for-sale | 200 | 203
Agency Collateralized Mortgage Obligations [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 0 |
Available for Sale, Amortized Cost, Due after five to ten years | 0 |
Available for Sale, Amortized Cost, Due after ten years | 49,759 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 0 |
Available for Sale, Fair Value, Due after five to ten years | 0 |
Available for Sale, Fair Value, Due after ten years | 49,002 |
Debt Securities, Available-for-sale, Amortized Cost | 49,759 | 78,966
Debt Securities, Available-for-sale | 49,002 | 79,677
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 0 |
Held to Maturity, Amortized Cost, Due after five to ten years | 34,215 |
Held to Maturity, Amortized Cost, Due after ten years | 542,749 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 0 |
Held to Maturity, Fair Value, Due after five to ten years | 32,252 |
Held to Maturity, Fair Value, Due after ten years | 510,314 |
Debt Securities, Held-to-maturity | 576,964 | 415,736
Held to Maturity, Fair Value, Total | 542,566 | 408,845
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 19,824 |
Available for Sale, Amortized Cost, Due after one year to five years | 80,449 |
Available for Sale, Amortized Cost, Due after five to ten years | 158,349 |
Available for Sale, Amortized Cost, Due after ten years | 163,129 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 19,844 |
Available for Sale, Fair Value, Due after one year to five years | 78,736 |
Available for Sale, Fair Value, Due after five to ten years | 144,812 |
Available for Sale, Fair Value, Due after ten years | 154,593 |
Debt Securities, Available-for-sale, Amortized Cost | 421,751 | 364,955
Debt Securities, Available-for-sale | 397,985 | 363,933
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 32,356 |
Held to Maturity, Amortized Cost, Due after five to ten years | 349,842 |
Held to Maturity, Amortized Cost, Due after ten years | 168,135 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 32,265 |
Held to Maturity, Fair Value, Due after five to ten years | 325,374 |
Held to Maturity, Fair Value, Due after ten years | 163,544 |
Debt Securities, Held-to-maturity | 550,333 | 493,012
Held to Maturity, Fair Value, Total | 521,183 | 497,236
US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items] |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 643,018 |
Available for Sale, Amortized Cost, Due after five to ten years | 230,590 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 0 |
Available for Sale, Fair Value, Due after one year to five years | 607,500 |
Available for Sale, Fair Value, Due after five to ten years | 214,833 |
Available for Sale, Fair Value, Due after ten years | 0 |
Debt Securities, Available-for-sale, Amortized Cost | 873,608 | 873,467
Debt Securities, Available-for-sale | 822,333 | 861,448
Held to Maturity, Amortized Cost |  |
Held to Maturity, Amortized Cost, Due in one year or less | 0 |
Held to Maturity, Amortized Cost, Due after one year to five years | 49,740 |
Held to Maturity, Amortized Cost, Due after five to ten years | 50,836 |
Held to Maturity, Amortized Cost, Due after ten years | 0 |
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Due in one year or less | 0 |
Held to Maturity, Fair Value, Due after one year to five years | 46,985 |
Held to Maturity, Fair Value, Due after five to ten years | 47,611 |
Held to Maturity, Fair Value, Due after ten years | 0 |
Debt Securities, Held-to-maturity | 100,576 | 102,560
Held to Maturity, Fair Value, Total | $ 94,596 | $ 102,242

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