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Investment Securities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
securities
Sep. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Available-for-sale: [Abstract]          
Amortized Cost $ 486,631   $ 486,631   $ 377,963
Gross Unrealized Gains 5,913   5,913   5,273
Gross Unrealized (Losses) (1,988)   (1,988)   (5,380)
Fair Value 490,556   490,556   377,856
Gain (Loss) on Sale of Securities, Net 1 $ (20) 231 $ 714  
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 49,105   49,105   53,650
Held-to-maturity Securities, Fair Value 49,105   49,105   53,937
Realized Investment Gains (Losses) [Abstract]          
Gross gains     231 1,451  
Gross losses     0 $ (737)  
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Amortized Cost 127,239   127,239   101,224
Gross Unrealized Gains 368   368   91
Gross Unrealized (Losses) (156)   (156)   (1,358)
Fair Value 127,451   127,451   99,957
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 49,105   49,105   53,650
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 931   931   299
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss (6)   (6)   (12)
Held-to-maturity Securities, Fair Value 50,030   50,030   53,937
Available-For-Sale Securities Transferred to Held-To-Maturity, Carrying Value 53,600   53,600    
Available-For-Sale Transfers To Held-To-Maturity, Gross Losses     1,400    
Obligations of states and political subdivisions          
Available-for-sale: [Abstract]          
Amortized Cost 95,354   95,354   75,589
Gross Unrealized Gains 2,354   2,354   2,608
Gross Unrealized (Losses) (207)   (207)   (113)
Fair Value 97,501   97,501   78,084
Mortgage-backed securities: GSE residential          
Available-for-sale: [Abstract]          
Amortized Cost 256,836   256,836   193,814
Gross Unrealized Gains 3,156   3,156   2,548
Gross Unrealized (Losses) (551)   (551)   (961)
Fair Value 259,441   259,441   195,401
Trust preferred securities          
Available-for-sale: [Abstract]          
Amortized Cost 3,167   3,167   3,300
Gross Unrealized Gains 0   0   0
Gross Unrealized (Losses) (1,042)   (1,042)   (2,936)
Fair Value 2,125   $ 2,125   364
Number of trust preferred securities | securities     1    
Trust preferred securities | Maximum [Member]          
Available-for-sale: [Abstract]          
Maturities of Debt Securities     twenty-two years    
Other securities          
Available-for-sale: [Abstract]          
Amortized Cost 4,035   $ 4,035   4,036
Gross Unrealized Gains 35   35   26
Gross Unrealized (Losses) (32)   (32)   (12)
Fair Value $ 4,038   $ 4,038   $ 4,050