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Securities (Reconciliation of fair value of securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | $ 400,665 | $ 363,366
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 4,241 | 3,890
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (3,069) | (3,612)
Available-for-sale Securities | 401,837 | 363,644
Held to maturity Securities, Amortized Cost | 502,123 | 487,076
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 3,659 | 3,556
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (4,865) | (4,982)
Held to Maturity, Fair Value, Total | 500,917 | 485,650
Amortized Cost | 902,788 | 850,442
Gross Unrealized Gains | 7,900 | 7,446
Unrealized Losses Other | (7,934) | (8,594)
Fair Value | 902,754 | 849,294
U. S. Government Agency Securities [Member] |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 24,007 | 24,006
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 262 | 238
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities | 24,269 | 24,244
U.S. Treasury securities |  |
Reconciliation of fair value of securities |  |
Held to maturity Securities, Amortized Cost | 1,007 | 1,007
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 45 | 47
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Fair Value, Total | 1,052 | 1,054
Agency mortgage-backed securities |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 186,103 | 173,268
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 2,729 | 2,852
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (498) | (736)
Available-for-sale Securities | 188,334 | 175,384
Held to maturity Securities, Amortized Cost | 184,317 | 156,088
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 2,283 | 2,274
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (1,024) | (858)
Held to Maturity, Fair Value, Total | 185,576 | 157,504
Agency Collateralized Mortgage Obligations [Member] |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 126,017 | 101,094
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 182 | 106
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (1,331) | (1,332)
Available-for-sale Securities | 124,868 | 99,868
Held to maturity Securities, Amortized Cost | 284,716 | 297,445
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 1,065 | 1,002
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (3,657) | (3,797)
Held to Maturity, Fair Value, Total | 282,124 | 294,650
State, County, and Municipal Securities [Member] |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 3,733 | 3,743
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 54 | 50
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Available-for-sale Securities | 3,787 | 3,793
Single Issuer Trust Preferred Securities Issued by Banks and Insurers [Member] |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 2,298 | 2,311
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 22 | 3
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | (3)
Available-for-sale Securities | 2,320 | 2,311
Held to maturity Securities, Amortized Cost | 1,500 | 1,500
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 38 | 44
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | 0 | 0
Held to Maturity, Fair Value, Total | 1,538 | 1,544
Pooled trust preferred securities issued by banks and insurers |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 2,201 | 2,200
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (605) | (616)
Available-for-sale Securities | 1,596 | 1,584
Small Business Administration Pooled Securities [Member] |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 37,140 | 37,561
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 28 | 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (166) | (372)
Available-for-sale Securities | 37,002 | 37,189
Held to maturity Securities, Amortized Cost | 30,583 | 31,036
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain | 228 | 189
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss | (184) | (327)
Held to Maturity, Fair Value, Total | 30,627 | 30,898
Equity securities |  |
Reconciliation of fair value of securities |  |
Available for sale Securities, Amortized Cost | 19,166 | 19,183
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax | 964 | 641
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax | (469) | (553)
Available-for-sale Securities | $ 19,661 | $ 19,271

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