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Securities (Schedule of Contractual Maturities of Securities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available for Sale, Amortized Cost |  |
Available for sale Securities, Amortized Cost | $ 454,575 | $ 448,219
Available for Sale, Fair Value |  |
Available for sale Securities, Fair Value, Total | 442,929 | 447,498
Held to Maturity, Amortized Cost |  |
Held to maturity Securities, Amortized Cost | 538,261 | 497,688
Held to Maturity, Fair Value |  |
Held to Maturity, Fair Value, Total | 523,288 | 494,194
Debt Securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 1,519 |
Available for Sale, Amortized Cost, Due after one year to five years | 64,261 |
Available for Sale, Amortized Cost, Due after five to ten years | 108,829 |
Available for Sale, Amortized Cost, Due after ten years | 279,966 |
Available for sale Securities, Amortized Cost | 454,575 |
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 1,522 |
Available for Sale, Fair Value, Due after one year to five years | 63,023 |
Available for Sale, Fair Value, Due after five to ten years | 106,155 |
Available for Sale, Fair Value, Due after ten years | 272,229 |
Available for sale Securities, Fair Value, Total | 442,929 |
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 | 10,003 |
Held to Maturity, Amortized Cost, Due after five to ten years | 32,590 |
Held to Maturity, Amortized Cost, Due after ten years | 495,668 |
Held to maturity Securities, Amortized Cost | 538,261 |
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 | 9,860 |
Held to Maturity, Fair Value, Due after five to ten years | 32,078 |
Held to Maturity, Fair Value, Due after ten years | 481,350 |
Held to Maturity, Fair Value, Total | 523,288 |
U.S. Government agency securities |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 999 |
Available for Sale, Amortized Cost, Due after one year to five years | 20,014 |
Available for Sale, Amortized Cost, Due after five to ten years | 12,466 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for sale Securities, Amortized Cost | 33,479 | 35,475
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 998 |
Available for Sale, Fair Value, Due after one year to five years | 19,781 |
Available for Sale, Fair Value, Due after five to ten years | 11,940 |
Available for Sale, Fair Value, Due after ten years | 0 |
Available for sale Securities, Fair Value, Total | 32,719 | 35,430
Small Business Administration Pooled Securities [Member] |  |
Available for Sale, Amortized Cost |  |
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 | 46,102 |
Available for sale Securities, Amortized Cost | 46,102 | 47,852
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 | 44,998 |
Available for sale Securities, Fair Value, Total | 44,998 | 47,778
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 | 25,711 |
Held to maturity Securities, Amortized Cost | 25,711 | 27,416
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 | 25,409 |
Held to Maturity, Fair Value, Total | 25,409 | 27,399
Pooled trust preferred securities issued by banks and insurers |  |
Available for Sale, Amortized Cost |  |
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 | 2,166 |
Available for sale Securities, Amortized Cost | 2,166 | 2,179
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 | 1,751 |
Available for sale Securities, Fair Value, Total | 1,751 | 1,640
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member] |  |
Available for Sale, Amortized Cost |  |
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 | 1,320 |
Available for sale Securities, Amortized Cost | 1,320 | 2,012
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 | 1,329 |
Available for sale Securities, Fair Value, Total | 1,329 | 2,016
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 Securities, Amortized Cost | 1,500 | 1,500
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 | 1,523 |
Held to Maturity, Fair Value, Due after ten years | 0 |
Held to Maturity, Fair Value, Total | 1,523 | 1,529
US States and Political Subdivisions Debt Securities [Member] |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 0 |
Available for Sale, Amortized Cost, Due after one year to five years | 1,024 |
Available for Sale, Amortized Cost, Due after five to ten years | 953 |
Available for Sale, Amortized Cost, Due after ten years | 0 |
Available for sale Securities, Amortized Cost | 1,977 | 2,237
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 | 1,026 |
Available for Sale, Fair Value, Due after five to ten years | 970 |
Available for Sale, Fair Value, Due after ten years | 0 |
Available for sale Securities, Fair Value, Total | 1,996 | 2,274
Collateralized Debt Obligations [Member] |  |
Available for Sale, Amortized Cost |  |
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 | 150,122 |
Available for sale Securities, Amortized Cost | 150,122 | 124,098
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 | 145,147 |
Available for sale Securities, Fair Value, Total | 145,147 | 122,012
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 | 1,179 |
Held to Maturity, Amortized Cost, Due after ten years | 322,567 |
Held to maturity Securities, Amortized Cost | 323,746 | 262,998
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 | 1,175 |
Held to Maturity, Fair Value, Due after ten years | 312,167 |
Held to Maturity, Fair Value, Total | 313,342 | 258,408
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Available for Sale, Amortized Cost |  |
Available for Sale, Amortized Cost, Due in one year or less | 520 |
Available for Sale, Amortized Cost, Due after one year to five years | 43,223 |
Available for Sale, Amortized Cost, Due after five to ten years | 95,410 |
Available for Sale, Amortized Cost, Due after ten years | 80,256 |
Available for sale Securities, Amortized Cost | 219,409 | 214,934
Available for Sale, Fair Value |  |
Available for Sale, Fair Value, Due in one year or less | 524 |
Available for Sale, Fair Value, Due after one year to five years | 42,216 |
Available for Sale, Fair Value, Due after five to ten years | 93,245 |
Available for Sale, Fair Value, Due after ten years | 79,004 |
Available for sale Securities, Fair Value, Total | 214,989 | 215,764
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 | 8,998 |
Held to Maturity, Amortized Cost, Due after five to ten years | 29,911 |
Held to Maturity, Amortized Cost, Due after ten years | 147,390 |
Held to maturity Securities, Amortized Cost | 186,299 | 204,768
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 | 8,846 |
Held to Maturity, Fair Value, Due after five to ten years | 29,380 |
Held to Maturity, Fair Value, Due after ten years | 143,774 |
Held to Maturity, Fair Value, Total | 182,000 | 205,823
US Treasury Securities [Member] |  |
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 | 1,005 |
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 Securities, Amortized Cost | 1,005 | 1,006
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 | 1,014 |
Held to Maturity, Fair Value, Due after five to ten years | 0 |
Held to Maturity, Fair Value, Due after ten years | 0 |
Held to Maturity, Fair Value, Total | $ 1,014 | $ 1,035

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