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Securities - General Disclosures (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
USD ($)
item
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Available for sale      
Amortized Cost $ 654,440   $ 759,751
Gross Unrealized Gains 3,341   4,079
Gross Unrealized Losses (3,565)   (4,019)
Fair Value 654,216   759,811
Held to maturity      
Amortized Cost 89,660   47,820
Gross Unrealized Gains 621   145
Gross Unrealized Losses (148)   (282)
Fair Value 90,133   47,683
Available for sale, Amortized Cost      
Due in one year or less 97,523    
Due after one year through five years 196,220    
Due after five years through ten years 64,842    
Due after ten years 291,815    
Amortized Cost 650,400    
Available for sale, Fair Value      
Due in one year or less 97,695    
Due after one year through five years 196,457    
Due after five years through ten years 66,044    
Due after ten years 289,655    
Fair Value 649,851    
Held to maturity, Amortized Cost      
Due in one year or less 1,285    
Due after one year through five years 20,126    
Due after five years through ten years 22,249    
Due after ten years 46,000    
Amortized Cost 89,660   47,820
Held to maturity, Fair Value      
Due in one year or less 1,287    
Due after one year through five years 20,231    
Due after five years through ten years 22,277    
Due after ten years 46,338    
Fair Value 90,133   47,683
Realized gains and losses related to sales of securities available for sale      
Gross security gains 968 $ 1,074  
Gross security (losses) (111) (7)  
Net security gains 857 1,067  
Tax provision related to net realized gains (losses) 300 $ 400  
Carrying amount of investment securities pledged as collateral 500,600   547,200
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 310,315   322,685
Continuous unrealized losses existing greater than 12 months, gross 1,156   1,154
Total 311,471   323,839
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (3,561)   (4,011)
Continuous unrealized losses existing greater than 12 months, gross (4)   (8)
Total (3,565)   (4,019)
Held to maturity, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 10,729   26,943
Total 10,729   26,943
Held to maturity, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (148)   (282)
Total $ (148)   (282)
Number of securities in unrealized loss position | item 195    
Securities in unrealized loss position as a percentage of aggregate carrying value of investments 1.14%    
U.S. Treasury securities      
Available for sale      
Amortized Cost $ 61,272   74,784
Gross Unrealized Gains 164   185
Gross Unrealized Losses (13)   (25)
Fair Value 61,423   74,944
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 10,007   9,997
Total 10,007   9,997
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (13)   (25)
Total (13)   (25)
Obligations of U.S. government corporations and agencies      
Available for sale      
Amortized Cost 77,246   79,577
Gross Unrealized Gains 30   46
Gross Unrealized Losses (422)   (496)
Fair Value 76,854   79,127
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 61,253   46,209
Total 61,253   46,209
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (422)   (496)
Total (422)   (496)
Obligations of states and political subdivisions      
Available for sale      
Amortized Cost 151,928   154,438
Gross Unrealized Gains 1,223   1,093
Gross Unrealized Losses (280)   (593)
Fair Value 152,871   154,938
Held to maturity      
Amortized Cost 43,069   44,333
Gross Unrealized Gains 268   122
Gross Unrealized Losses (39)   (160)
Fair Value 43,298   44,295
Held to maturity, Amortized Cost      
Amortized Cost 43,069   44,333
Held to maturity, Fair Value      
Fair Value 43,298   44,295
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 48,103   64,832
Continuous unrealized losses existing greater than 12 months, gross 1,156   1,154
Total 49,259   65,986
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (276)   (585)
Continuous unrealized losses existing greater than 12 months, gross (4)   (8)
Total (280)   (593)
Held to maturity, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 8,344   24,558
Total 8,344   24,558
Held to maturity, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (39)   (160)
Total (39)   (160)
Residential mortgage-backed securities      
Available for sale      
Amortized Cost 328,924   303,641
Gross Unrealized Gains 1,452   1,390
Gross Unrealized Losses (2,828)   (2,782)
Fair Value 327,548   302,249
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 183,163   168,898
Total 183,163   168,898
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (2,828)   (2,782)
Total (2,828)   (2,782)
Corporate debt securities      
Available for sale      
Amortized Cost 31,030   142,836
Gross Unrealized Gains 147   630
Gross Unrealized Losses (22)   (123)
Fair Value 31,155   143,343
Available for sale, Fair Value      
Continuous unrealized losses existing for less than 12 months, gross 7,789   32,749
Total 7,789   32,749
Available for sale, Unrealized Losses      
Continuous unrealized losses existing for less than 12 months, gross (22)   (123)
Total (22)   (123)
Debt securities      
Available for sale      
Amortized Cost 650,400   755,276
Gross Unrealized Gains 3,016   3,344
Gross Unrealized Losses (3,565)   (4,019)
Fair Value 649,851   754,601
Mutual funds and other equity securities      
Available for sale      
Amortized Cost 4,040   4,475
Gross Unrealized Gains 325   735
Fair Value 4,365   5,210
Commercial and residential mortgage-backed securities      
Held to maturity      
Amortized Cost 46,591    
Gross Unrealized Gains 353    
Gross Unrealized Losses (109)    
Fair Value 46,835    
Held to maturity, Amortized Cost      
Amortized Cost 46,591    
Held to maturity, Fair Value      
Fair Value 46,835    
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 (109)    
Total $ (109)    
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)