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Securities - General Disclosures (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
item
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Available for sale          
Amortized Cost $ 645,841   $ 645,841   $ 759,751
Gross Unrealized Gains 3,293   3,293   4,079
Gross Unrealized Losses (2,785)   (2,785)   (4,019)
Fair Value 646,349   646,349   759,811
Held to maturity          
Amortized Cost 208,634   208,634   47,820
Gross Unrealized Gains 820   820   145
Gross Unrealized Losses (451)   (451)   (282)
Fair Value 209,003   209,003   47,683
Available for sale, Amortized Cost          
Due in one year or less 71,081   71,081    
Due after one year through five years 222,954   222,954    
Due after five years through ten years 67,533   67,533    
Due after ten years 279,554   279,554    
Amortized Cost 641,122   641,122    
Available for sale, Fair Value          
Due in one year or less 71,198   71,198    
Due after one year through five years 223,168   223,168    
Due after five years through ten years 68,875   68,875    
Due after ten years 278,080   278,080    
Fair Value 641,321   641,321    
Held to maturity, Amortized Cost          
Due in one year or less 1,764   1,764    
Due after one year through five years 21,022   21,022    
Due after five years through ten years 20,530   20,530    
Due after ten years 165,318   165,318    
Amortized Cost 208,634   208,634   47,820
Held to maturity, Fair Value          
Due in one year or less 1,766   1,766    
Due after one year through five years 21,173   21,173    
Due after five years through ten years 20,704   20,704    
Due after ten years 165,360   165,360    
Fair Value 209,003   209,003   47,683
Realized gains and losses related to sales of securities available for sale          
Gross security gains 1 $ 171 969 $ 1,245  
Gross security (losses) (5) (19) (116) (26)  
Net security (losses) gains (4) 152 853 1,219  
Tax provision related to net realized gains (losses)   $ 100 300 $ 400  
Carrying amount of investment securities pledged as collateral 541,400   541,400   547,200
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 289,909   289,909   322,685
Continuous unrealized losses existing greater than 12 months, gross 3,020   3,020   1,154
Total 292,929   292,929   323,839
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (2,753)   (2,753)   (4,011)
Continuous unrealized losses existing greater than 12 months, gross (32)   (32)   (8)
Total (2,785)   (2,785)   (4,019)
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 128,172   128,172   26,943
Total $ 128,172   128,172   26,943
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (451)   (282)
Total     $ (451)   (282)
Number of securities in unrealized loss position | item 196   196    
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 0.76%   0.76%    
U.S. Treasury securities          
Available for sale          
Amortized Cost $ 85,793   $ 85,793   74,784
Gross Unrealized Gains 116   116   185
Gross Unrealized Losses (61)   (61)   (25)
Fair Value 85,848   85,848   74,944
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 24,525   24,525   9,997
Total 24,525   24,525   9,997
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (61)   (61)   (25)
Total (61)   (61)   (25)
Obligations of U.S. government corporations and agencies          
Available for sale          
Amortized Cost 67,122   67,122   79,577
Gross Unrealized Gains 26   26   46
Gross Unrealized Losses (373)   (373)   (496)
Fair Value 66,775   66,775   79,127
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 52,159   52,159   46,209
Total 52,159   52,159   46,209
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (373)   (373)   (496)
Total (373)   (373)   (496)
Obligations of states and political subdivisions          
Available for sale          
Amortized Cost 142,242   142,242   154,438
Gross Unrealized Gains 1,311   1,311   1,093
Gross Unrealized Losses (200)   (200)   (593)
Fair Value 143,353   143,353   154,938
Held to maturity          
Amortized Cost 42,546   42,546   44,333
Gross Unrealized Gains 407   407   122
Gross Unrealized Losses (10)   (10)   (160)
Fair Value 42,943   42,943   44,295
Held to maturity, Amortized Cost          
Amortized Cost 42,546   42,546   44,333
Held to maturity, Fair Value          
Fair Value 42,943   42,943   44,295
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 46,018   46,018   64,832
Continuous unrealized losses existing greater than 12 months, gross 2,536   2,536   1,154
Total 48,554   48,554   65,986
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (172)   (172)   (585)
Continuous unrealized losses existing greater than 12 months, gross (28)   (28)   (8)
Total (200)   (200)   (593)
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 5,621   5,621   24,558
Total 5,621   5,621   24,558
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (10)   (160)
Total     (10)   (160)
Residential mortgage-backed securities          
Available for sale          
Amortized Cost 314,169   314,169   303,641
Gross Unrealized Gains 1,322   1,322   1,390
Gross Unrealized Losses (2,140)   (2,140)   (2,782)
Fair Value 313,351   313,351   302,249
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 161,359   161,359   168,898
Total 161,359   161,359   168,898
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (2,140)   (2,140)   (2,782)
Total (2,140)   (2,140)   (2,782)
Corporate debt securities          
Available for sale          
Amortized Cost 31,796   31,796   142,836
Gross Unrealized Gains 209   209   630
Gross Unrealized Losses (11)   (11)   (123)
Fair Value 31,994   31,994   143,343
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 5,848   5,848   32,749
Continuous unrealized losses existing greater than 12 months, gross 484   484    
Total 6,332   6,332   32,749
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (7)   (7)   (123)
Continuous unrealized losses existing greater than 12 months, gross (4)   (4)    
Total (11)   (11)   (123)
Total debt securities          
Available for sale          
Amortized Cost 641,122   641,122   755,276
Gross Unrealized Gains 2,984   2,984   3,344
Gross Unrealized Losses (2,785)   (2,785)   (4,019)
Fair Value 641,321   641,321   754,601
Mutual funds and other equity securities          
Available for sale          
Amortized Cost 4,719   4,719   4,475
Gross Unrealized Gains 309   309   735
Fair Value 5,028   5,028   5,210
Commercial and residential mortgage-backed securities          
Held to maturity          
Amortized Cost 166,088   166,088    
Gross Unrealized Gains 413   413    
Gross Unrealized Losses (441)   (441)    
Fair Value 166,060   166,060    
Held to maturity, Amortized Cost          
Amortized Cost 166,088   166,088    
Held to maturity, Fair Value          
Fair Value 166,060   166,060    
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 122,551   122,551    
Total $ 122,551   122,551    
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (441)    
Total     $ (441)    
Commercial mortgage-backed securities          
Held to maturity          
Amortized Cost         3,487
Gross Unrealized Gains         23
Gross Unrealized Losses         (122)
Fair Value         3,388
Held to maturity, Amortized Cost          
Amortized Cost         3,487
Held to maturity, Fair Value          
Fair Value         3,388
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross         2,385
Total         2,385
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross         (122)
Total         $ (122)