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Investment Securities (Available-for-sale Securities) (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities    
Securities of a single issuer, other than US Treasury, government agencies and US government sponsored agencies exceeding 10% of Stockholders' Equity $ 0  
Amortized Cost 782,947,000 $ 777,017,000
Gross Unrealized Gains 14,726,000 12,695,000
Gross Unrealized Losses (10,712,000) (11,772,000)
Available-for-sale securities 786,961,000 777,940,000
U.S. government sponsored agencies    
Schedule of Available-for-sale Securities    
Amortized Cost   1,000,000
Gross Unrealized Gains   0
Gross Unrealized Losses   0
Available-for-sale securities   1,000,000
States and political subdivisions    
Schedule of Available-for-sale Securities    
Amortized Cost 112,774,000 115,657,000
Gross Unrealized Gains 2,121,000 1,836,000
Gross Unrealized Losses (183,000) (263,000)
Available-for-sale securities 114,712,000 117,230,000
Residential mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 646,503,000 633,802,000
Gross Unrealized Gains 3,840,000 3,758,000
Gross Unrealized Losses (10,044,000) (10,993,000)
Available-for-sale securities 640,299,000 626,567,000
Commercial mortgage-backed securities    
Schedule of Available-for-sale Securities    
Amortized Cost 16,511,000 19,337,000
Gross Unrealized Gains 33,000 41,000
Gross Unrealized Losses (120,000) (87,000)
Available-for-sale securities 16,424,000 19,291,000
Bank-issued trust preferred securities    
Schedule of Available-for-sale Securities    
Amortized Cost 5,176,000 5,169,000
Gross Unrealized Gains 87,000 91,000
Gross Unrealized Losses (299,000) (361,000)
Available-for-sale securities 4,964,000 4,899,000
Equity securities    
Schedule of Available-for-sale Securities    
Amortized Cost 1,983,000 2,052,000
Gross Unrealized Gains 8,645,000 6,969,000
Gross Unrealized Losses (66,000) (68,000)
Available-for-sale securities $ 10,562,000 $ 8,953,000