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Securities, Held to Maturity (Details)
$ in Thousands
Mar. 31, 2016
USD ($)
Position
Dec. 31, 2015
USD ($)
Position
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 466,914 $ 471,031
Unrealized gains 8,817 3,794
Unrealized losses (621) (1,685)
Estimated fair value 475,110 473,140
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 2,190 117,129
12 Months or Longer, Fair Value 40,987 41,523
Total, Fair Value 43,177 158,652
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (17) (406)
12 Months or Longer, Unrealized Losses (604) (1,279)
Total, Unrealized Losses $ (621) $ (1,685)
Unrealized Loss Position, Number of Positions [Abstract]    
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position 4 16
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position 4 4
Total, Number of Positions | Position 8 20
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Within one year $ 43,553  
From one to five years 18,837  
From five to ten years 131,744  
After ten years 272,780  
Amortized cost 466,914 $ 471,031
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 43,582  
From one to five years 18,973  
From five to ten years 134,917  
After ten years 277,638  
Total, Fair Value 475,110 473,140
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value   9,325
12 Months or Longer, Fair Value   0
Total, Fair Value   9,325
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses   (107)
12 Months or Longer, Unrealized Losses   0
Total, Unrealized Losses   $ (107)
Unrealized Loss Position, Number of Positions [Abstract]    
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position   1
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position   0
Total, Number of Positions | Position   1
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 9,112 $ 9,432
Unrealized gains 99 0
Unrealized losses 0 (107)
Estimated fair value 9,211 9,325
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 9,112 9,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 9,211 9,325
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 588 611
Unrealized gains 104 95
Unrealized losses 0 0
Estimated fair value 692 706
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 588 611
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 692 706
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 0 105,604
12 Months or Longer, Fair Value 40,987 41,523
Total, Fair Value 40,987 147,127
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses 0 (281)
12 Months or Longer, Unrealized Losses (604) (1,279)
Total, Unrealized Losses $ (604) $ (1,560)
Unrealized Loss Position, Number of Positions [Abstract]    
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position 0 12
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position 4 4
Total, Number of Positions | Position 4 16
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 262,741 $ 272,550
Unrealized gains 5,022 1,411
Unrealized losses (604) (1,560)
Estimated fair value 267,159 272,401
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 262,741 272,550
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 267,159 272,401
State & Municipal [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 194,473 188,438
Unrealized gains 3,592 2,288
Unrealized losses (17) (18)
Estimated fair value 198,048 190,708
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 2,190 2,200
12 Months or Longer, Fair Value 0 0
Total, Fair Value 2,190 2,200
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (17) (18)
12 Months or Longer, Unrealized Losses 0 0
Total, Unrealized Losses $ (17) $ (18)
Unrealized Loss Position, Number of Positions [Abstract]    
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less than One Year | Position 4 3
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position 0 0
Total, Number of Positions | Position 4 3
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost $ 194,473 $ 188,438
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value $ 198,048 $ 190,708