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Investment Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2015
USD ($)
securities
Jun. 30, 2014
USD ($)
Dec. 31, 2014
USD ($)
Available-for-sale: [Abstract]          
Amortized Cost $ 422,382   $ 422,382   $ 377,963
Gross Unrealized Gains 3,738   3,738   5,273
Gross Unrealized (Losses) (4,197)   (4,197)   (5,380)
Fair Value 421,923   421,923   377,856
Gain (Loss) on Sale of Securities, Net 1 $ 543 230 $ 734  
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 43,973   43,973   53,650
Held-to-maturity Securities, Fair Value 44,505   44,505   53,937
Realized Investment Gains (Losses) [Abstract]          
Gross gains     230 1,435  
Gross losses     0 $ (701)  
U.S. Treasury securities and obligations of U.S. government corporations & agencies          
Available-for-sale: [Abstract]          
Amortized Cost 122,307   122,307   101,224
Gross Unrealized Gains 167   167   91
Gross Unrealized (Losses) (740)   (740)   (1,358)
Fair Value 121,734   121,734   99,957
Held-to-maturity: [Abstract]          
Held-to-maturity Securities 43,973   43,973   53,650
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain 532   532   299
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss 0   0   (12)
Held-to-maturity Securities, Fair Value 44,505   44,505   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 83,004   83,004   75,589
Gross Unrealized Gains 1,840   1,840   2,608
Gross Unrealized (Losses) (550)   (550)   (113)
Fair Value 84,294   84,294   78,084
Mortgage-backed securities: GSE residential          
Available-for-sale: [Abstract]          
Amortized Cost 209,835   209,835   193,814
Gross Unrealized Gains 1,700   1,700   2,548
Gross Unrealized (Losses) (1,843)   (1,843)   (961)
Fair Value 209,692   209,692   195,401
Trust preferred securities          
Available-for-sale: [Abstract]          
Amortized Cost 3,201   3,201   3,300
Gross Unrealized Gains 0   0   0
Gross Unrealized (Losses) (1,060)   (1,060)   (2,936)
Fair Value 2,141   $ 2,141   364
Number of trust preferred securities | securities     1    
Trust preferred securities | Maximum [Member]          
Available-for-sale: [Abstract]          
Maturities of Debt Securities          
Other securities          
Available-for-sale: [Abstract]          
Amortized Cost 4,035   $ 4,035   4,036
Gross Unrealized Gains 31   31   26
Gross Unrealized (Losses) (4)   (4)   (12)
Fair Value $ 4,062   $ 4,062   $ 4,050