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Investment Securities Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 17,882 | $ 168,818 | $ 67,483
Unrealized Loss (Less than 12 months) | (176) | (2,525) | (1,052)
Fair Value (Estimated) (12 months or more) | 8,282 | 21,048 | 12,609
Unrealized Loss (12 months or more) | (213) | (950) | (361)
Fair Value (Estimated) | 26,164 | 189,866 | 80,092
Unrealized Losses | (389) | (3,475) | (1,413)
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 45,311 | 36,459
Unrealized Loss (Less than 12 months) | 0 | (1,469) | (595)
Fair Value (Estimated) (12 months or more) | 4,893 | 17,185 | 10,903
Unrealized Loss (12 months or more) | (107) | (815) | (317)
Fair Value (Estimated) | 4,893 | 62,496 | 47,362
Unrealized Losses | (107) | (2,284) | (912)
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 17,125 | 120,915 | 20,634
Unrealized Loss (Less than 12 months) | (170) | (1,027) | (256)
Fair Value (Estimated) (12 months or more) | 1,866 | 910 | 65
Unrealized Loss (12 months or more) | (70) | (71) | (2)
Fair Value (Estimated) | 18,991 | 121,825 | 20,699
Unrealized Losses | (240) | (1,098) | (258)
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 522 | 2,528 | 10,390
Unrealized Loss (Less than 12 months) | 0 | (24) | (201)
Fair Value (Estimated) (12 months or more) | 1,417 | 2,901 | 1,641
Unrealized Loss (12 months or more) | (19) | (63) | (42)
Fair Value (Estimated) | 1,939 | 5,429 | 12,031
Unrealized Losses | (19) | (87) | $ (243)
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 235 | 64 |
Unrealized Loss (Less than 12 months) | (6) | (5) |
Fair Value (Estimated) (12 months or more) | 106 | 52 |
Unrealized Loss (12 months or more) | (17) | (1) |
Fair Value (Estimated) | 341 | 116 |
Unrealized Losses | $ (23) | $ (6) |

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