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Securities, Held to Maturity (Details)
$ in Thousands
Sep. 30, 2016
USD ($)
Position
Dec. 31, 2015
USD ($)
Position
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 485,877 $ 471,031
Unrealized gains 10,162 3,794
Unrealized losses (443) (1,685)
Estimated fair value 495,596 473,140
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 5,501 117,129
12 Months or Longer, Fair Value 37,888 41,523
Total, Fair Value 43,389 158,652
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (57) (406)
12 Months or Longer, Unrealized Losses (386) (1,279)
Total, Unrealized Losses $ (443) $ (1,685)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 9 16
12 Months or Longer, Number of Positions | Position 4 4
Total, Number of Positions | Position 13 20
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Within one year $ 34,787  
From one to five years 25,392  
From five to ten years 123,615  
After ten years 302,083  
Amortized cost 485,877 $ 471,031
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 34,790  
From one to five years 25,639  
From five to ten years 126,865  
After ten years 308,302  
Total, Fair Value 495,596 473,140
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]    
Less Than 12 Months, Number of Positions | Position   1
12 Months or Longer, Number of Positions | 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 49,229 $ 9,432
Unrealized gains 617 0
Unrealized losses 0 (107)
Estimated fair value 49,846 9,325
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 49,229 9,432
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 49,846 9,325
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 549 611
Unrealized gains 101 95
Unrealized losses 0 0
Estimated fair value 650 706
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 549 611
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 650 706
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 37,888 41,523
Total, Fair Value 37,888 147,127
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses 0 (281)
12 Months or Longer, Unrealized Losses (386) (1,279)
Total, Unrealized Losses $ (386) $ (1,560)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 0 12
12 Months or Longer, Number of Positions | 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 $ 237,819 $ 272,550
Unrealized gains 5,314 1,411
Unrealized losses (386) (1,560)
Estimated fair value 242,747 272,401
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 237,819 272,550
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 242,747 272,401
State & Municipal [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 198,280 188,438
Unrealized gains 4,130 2,288
Unrealized losses (57) (18)
Estimated fair value 202,353 190,708
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 5,501 2,200
12 Months or Longer, Fair Value 0 0
Total, Fair Value 5,501 2,200
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (57) (18)
12 Months or Longer, Unrealized Losses 0 0
Total, Unrealized Losses $ (57) $ (18)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 9 3
12 Months or Longer, Number of Positions | Position 0 0
Total, Number of Positions | Position 9 3
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost $ 198,280 $ 188,438
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value $ 202,353 $ 190,708