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Investment Securities Temporarily Impaired Securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) $ 216,760 $ 17,298 $ 47,558
Unrealized Loss (Less than 12 months) (4,477) (74) (739)
Fair Value (Estimated) (12 months or more) 20,497 111,694 163,912
Unrealized Loss (12 months or more) (1,333) (2,825) (10,237)
Fair Value (Estimated) 237,257 128,992 211,470
Unrealized Losses (5,810) (2,899) (10,976)
U.S. Government-sponsored agencies      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 55,147 0 0
Unrealized Loss (Less than 12 months) (1,988) 0 0
Fair Value (Estimated) (12 months or more) 16,953 79,444 85,167
Unrealized Loss (12 months or more) (1,047) (2,066) (6,343)
Fair Value (Estimated) 72,100 79,444 85,167
Unrealized Losses (3,035) (2,066) (6,343)
Mortgage-backed securities      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 89,332 13,878 39,436
Unrealized Loss (Less than 12 months) (1,280) (40) (668)
Fair Value (Estimated) (12 months or more) 1,194 29,182 32,975
Unrealized Loss (12 months or more) (80) (654) (1,550)
Fair Value (Estimated) 90,526 43,060 72,411
Unrealized Losses (1,360) (694) (2,218)
State and political subdivisions      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 72,217 3,352 8,122
Unrealized Loss (Less than 12 months) (1,202) (31) (71)
Fair Value (Estimated) (12 months or more) 2,299 3,017 45,718
Unrealized Loss (12 months or more) (205) (104) (2,343)
Fair Value (Estimated) 74,516 6,369 53,840
Unrealized Losses (1,407) (135) (2,414)
Other equity securities      
Schedule of Available-for-sale Securities [Line Items]      
Fair Value (Estimated) (Less than 12 months) 64 68 0
Unrealized Loss (Less than 12 months) (7) (3) 0
Fair Value (Estimated) (12 months or more) 51 51 52
Unrealized Loss (12 months or more) (1) (1) (1)
Fair Value (Estimated) 115 119 52
Unrealized Losses $ (8) $ (4) $ (1)