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Securities - General Disclosures (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
item
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Available for sale          
Amortized Cost $ 707,466   $ 707,466   $ 759,751
Gross Unrealized Gains 3,398   3,398   4,079
Gross Unrealized Losses (2,617)   (2,617)   (4,019)
Fair Value 708,247   708,247   759,811
Held to maturity          
Amortized Cost 281,975   281,975   47,820
Gross Unrealized Gains 1,053   1,053   145
Gross Unrealized Losses (540)   (540)   (282)
Fair Value 282,488   282,488   47,683
Available for sale, Amortized Cost          
Due in one year or less 51,883   51,883    
Due after one year through five years 249,272   249,272    
Due after five years through ten years 97,011   97,011    
Due after ten years 306,078   306,078    
Amortized Cost 704,244   704,244    
Available for sale, Fair Value          
Due in one year or less 51,964   51,964    
Due after one year through five years 249,465   249,465    
Due after five years through ten years 98,295   98,295    
Due after ten years 305,301   305,301    
Fair Value 705,025   705,025    
Held to maturity, Amortized Cost          
Due in one year or less 2,882   2,882    
Due after one year through five years 59,859   59,859    
Due after five years through ten years 37,867   37,867    
Due after ten years 181,367   181,367    
Amortized Cost 281,975   281,975   47,820
Held to maturity, Fair Value          
Due in one year or less 2,884   2,884    
Due after one year through five years 60,116   60,116    
Due after five years through ten years 38,116   38,116    
Due after ten years 181,372   181,372    
Fair Value 282,488   282,488   47,683
Realized gains and losses related to sales of securities available for sale          
Gross security gains 290 $ 136 1,259 $ 1,381  
Gross security (losses)   (125) (116) (151)  
Net security gains 290 $ 11 1,143 1,230  
Tax provision related to net realized gains (losses) 100   400 $ 400  
Carrying amount of investment securities pledged as collateral 571,900   571,900   547,200
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 294,586   294,586   322,685
Continuous unrealized losses existing greater than 12 months, gross 8,931   8,931   1,154
Total 303,517   303,517   323,839
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (2,511)   (2,511)   (4,011)
Continuous unrealized losses existing greater than 12 months, gross (106)   (106)   (8)
Total (2,617)   (2,617)   (4,019)
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 91,443   91,443   26,943
Continuous unrealized losses existing for greater than 12 months, gross 86   86    
Total $ 91,529   91,529   26,943
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (540)   (282)
Total     $ (540)   (282)
Number of securities in unrealized loss position | item 250   250    
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 0.79%   0.79%    
U.S. Treasury securities          
Available for sale          
Amortized Cost $ 60,799   $ 60,799   74,784
Gross Unrealized Gains 74   74   185
Gross Unrealized Losses (73)   (73)   (25)
Fair Value 60,800   60,800   74,944
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 24,538   24,538   9,997
Total 24,538   24,538   9,997
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (73)   (73)   (25)
Total (73)   (73)   (25)
Obligations of U.S. government corporations and agencies          
Available for sale          
Amortized Cost 64,827   64,827   79,577
Gross Unrealized Gains 17   17   46
Gross Unrealized Losses (388)   (388)   (496)
Fair Value 64,456   64,456   79,127
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 61,129   61,129   46,209
Total 61,129   61,129   46,209
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (388)   (388)   (496)
Total (388)   (388)   (496)
Obligations of states and political subdivisions          
Available for sale          
Amortized Cost 215,912   215,912   154,438
Gross Unrealized Gains 1,470   1,470   1,093
Gross Unrealized Losses (274)   (274)   (593)
Fair Value 217,108   217,108   154,938
Held to maturity          
Amortized Cost 42,403   42,403   44,333
Gross Unrealized Gains 440   440   122
Gross Unrealized Losses (6)   (6)   (160)
Fair Value 42,837   42,837   44,295
Held to maturity, Amortized Cost          
Amortized Cost 42,403   42,403   44,333
Held to maturity, Fair Value          
Fair Value 42,837   42,837   44,295
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 66,122   66,122   64,832
Continuous unrealized losses existing greater than 12 months, gross 6,844   6,844   1,154
Total 72,966   72,966   65,986
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (193)   (193)   (585)
Continuous unrealized losses existing greater than 12 months, gross (81)   (81)   (8)
Total (274)   (274)   (593)
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 4,552   4,552   24,558
Continuous unrealized losses existing for greater than 12 months, gross 86   86    
Total 4,638   4,638   24,558
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (6)   (160)
Total     (6)   (160)
Residential mortgage-backed securities          
Available for sale          
Amortized Cost 330,098   330,098   303,641
Gross Unrealized Gains 1,570   1,570   1,390
Gross Unrealized Losses (1,875)   (1,875)   (2,782)
Fair Value 329,793   329,793   302,249
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 141,154   141,154   168,898
Continuous unrealized losses existing greater than 12 months, gross 1,602   1,602    
Total 142,756   142,756   168,898
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (1,854)   (1,854)   (2,782)
Continuous unrealized losses existing greater than 12 months, gross (21)   (21)    
Total (1,875)   (1,875)   (2,782)
Corporate debt securities          
Available for sale          
Amortized Cost 32,608   32,608   142,836
Gross Unrealized Gains 267   267   630
Gross Unrealized Losses (7)   (7)   (123)
Fair Value 32,868   32,868   143,343
Available for sale, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 1,643   1,643   32,749
Continuous unrealized losses existing greater than 12 months, gross 485   485    
Total 2,128   2,128   32,749
Available for sale, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross (3)   (3)   (123)
Continuous unrealized losses existing greater than 12 months, gross (4)   (4)    
Total (7)   (7)   (123)
Total debt securities          
Available for sale          
Amortized Cost 704,244   704,244   755,276
Gross Unrealized Gains 3,398   3,398   3,344
Gross Unrealized Losses (2,617)   (2,617)   (4,019)
Fair Value 705,025   705,025   754,601
Mutual funds and other equity securities          
Available for sale          
Amortized Cost 3,222   3,222   4,475
Gross Unrealized Gains         735
Fair Value 3,222   3,222   5,210
Commercial and residential mortgage-backed securities          
Held to maturity          
Amortized Cost 239,572   239,572    
Gross Unrealized Gains 613   613    
Gross Unrealized Losses (534)   (534)    
Fair Value 239,651   239,651    
Held to maturity, Amortized Cost          
Amortized Cost 239,572   239,572    
Held to maturity, Fair Value          
Fair Value 239,651   239,651    
Held to maturity, Fair Value          
Continuous unrealized losses existing for less than 12 months, gross 86,891   86,891    
Total $ 86,891   86,891    
Held to maturity, Unrealized Losses          
Continuous unrealized losses existing for less than 12 months, gross     (534)    
Total     $ (534)    
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)