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Securities (Details)
$ in Thousands
Sep. 30, 2015
USD ($)
Position
Dec. 31, 2014
USD ($)
Position
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,043,620 $ 1,001,718
Unrealized gains 15,255 14,823
Unrealized losses (478) (3,370)
Estimated fair value 1,058,397 1,013,171
Amortized costs of securities available for sale pledged to secure public deposits 1,100,000 1,000,000
Amortized costs of securities available for sale pledged as collateral for repurchase agreements 174,800 208,800
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 64,183 143,428
12 Months or Longer, Fair Value 42,498 244,836
Total, Fair Value 106,681 388,264
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (204) (500)
12 months or longer Unrealized Losses (274) (2,870)
Total Unrealized Losses $ (478) $ (3,370)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 25 59
12 Months or Longer, Number of Positions | Position 25 58
Total, Number of Positions | Position 50 117
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 470,758 $ 454,361
Unrealized gains 5,697 2,721
Unrealized losses (1,019) (2,088)
Estimated fair value 475,436 454,994
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 16,070 69,566
12 Months or Longer, Fair Value 43,127 48,034
Total, Fair Value 59,197 117,600
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (68) (165)
12 Months or Longer, Unrealized Losses (951) (1,923)
Total, Unrealized Losses $ (1,019) $ (2,088)
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 12 112
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position 4 10
Total, Number of Positions | Position 16 122
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]    
Within one year $ 4,031  
From one to five years 369,188  
From five to ten years 137,908  
After ten years 519,593  
Total, Amortized Cost 1,030,720  
Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 4,058  
From one to five years 371,294  
From five to ten years 140,701  
After ten years 527,013  
Total, Fair Value 1,043,066  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Within one year 42,420  
From one to five years 15,186  
From five to ten years 107,816  
After ten years 305,336  
Amortized cost 470,758 $ 454,361
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Within one year 42,427  
From one to five years 15,260  
From five to ten years 109,043  
After ten years 308,706  
Total, Fair Value 475,436 454,994
US Treasury [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost   23,041
Unrealized gains   70
Unrealized losses   0
Estimated fair value   23,111
Federal Agency [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 342,140 332,193
Unrealized gains 1,245 327
Unrealized losses (122) (2,606)
Estimated fair value 343,263 329,914
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 19,962 66,528
12 Months or Longer, Fair Value 29,908 198,151
Total, Fair Value 49,870 264,679
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (30) (226)
12 months or longer Unrealized Losses (92) (2,380)
Total Unrealized Losses $ (122) $ (2,606)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 2 8
12 Months or Longer, Number of Positions | Position 3 16
Total, Number of Positions | Position 5 24
State & Municipal [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 33,140 $ 37,035
Unrealized gains 510 587
Unrealized losses (3) (52)
Estimated fair value 33,647 37,570
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 2,957 8,818
12 Months or Longer, Fair Value 0 1,321
Total, Fair Value 2,957 10,139
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (3) (42)
12 months or longer Unrealized Losses 0 (10)
Total Unrealized Losses $ (3) $ (52)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 4 33
12 Months or Longer, Number of Positions | Position 0 5
Total, Number of Positions | Position 4 38
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value $ 11,656 $ 10,400
12 Months or Longer, Fair Value 4,319 35,565
Total, Fair Value 15,975 45,965
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (109) (36)
12 months or longer Unrealized Losses (60) (254)
Total Unrealized Losses $ (169) $ (290)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 14 10
12 Months or Longer, Number of Positions | Position 16 31
Total, Number of Positions | Position 30 41
Mortgage-backed Securities, Issued by US Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 313,840 $ 339,190
Unrealized gains 7,118 7,597
Unrealized losses (105) (224)
Estimated fair value 320,853 346,563
Mortgage-backed Securities, Issued by US Government Agency Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 14,293 17,367
Unrealized gains 728 863
Unrealized losses (64) (66)
Estimated fair value 14,957 18,164
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 29,608 57,682
12 Months or Longer, Fair Value 4,340 6,598
Total, Fair Value 33,948 64,280
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses (62) (196)
12 months or longer Unrealized Losses (22) (74)
Total Unrealized Losses $ (84) $ (270)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 5 8
12 Months or Longer, Number of Positions | Position 3 4
Total, Number of Positions | Position 8 12
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 296,005 $ 199,837
Unrealized gains 2,638 1,828
Unrealized losses (63) (234)
Estimated fair value 298,580 201,431
Collateralized Mortgage Obligations, U.S. Government Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 31,302 40,237
Unrealized gains 485 497
Unrealized losses (21) (36)
Estimated fair value 31,766 40,698
Other Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 12,900 12,818
Unrealized gains 2,531 3,054
Unrealized losses (100) (152)
Estimated fair value 15,331 15,720
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 0 0
12 Months or Longer, Fair Value 3,931 3,201
Total, Fair Value 3,931 3,201
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less than 12 months Unrealized Losses 0 0
12 months or longer Unrealized Losses (100) (152)
Total Unrealized Losses $ (100) $ (152)
Unrealized Loss Position, Number of Positions [Abstract]    
Less Than 12 Months, Number of Positions | Position 0 0
12 Months or Longer, Number of Positions | Position 3 2
Total, Number of Positions | Position 3 2
Mortgage-Backed [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value $ 9,757  
12 Months or Longer, Fair Value 0  
Total, Fair Value 9,757  
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (25)  
12 Months or Longer, Unrealized Losses 0  
Total, Unrealized Losses $ (25)  
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 [Member] | Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 9,782 $ 755
Unrealized gains 0 113
Unrealized losses (25) 0
Estimated fair value 9,757 868
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 9,782 755
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 9,757 868
Mortgage-Backed [Member] | Collateralized Mortgage Obligations, U.S. Government Securities [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 665  
Unrealized gains 107  
Unrealized losses 0  
Estimated fair value 772  
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 665  
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 772  
State & Municipal [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost 177,345 135,978
Unrealized gains 1,509 674
Unrealized losses (43) (123)
Estimated fair value 178,811 136,529
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 6,313 43,514
12 Months or Longer, Fair Value 0 1,619
Total, Fair Value 6,313 45,133
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses (43) (116)
12 Months or Longer, Unrealized Losses 0 (7)
Total, Unrealized Losses $ (43) $ (123)
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 11 110
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater Than or Equal to One Year | Position 0 6
Total, Number of Positions | Position 11 116
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost $ 177,345 $ 135,978
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value 178,811 136,529
Collateralized Mortgage Obligations [Member]    
Unrealized Loss Position, Fair Value [Abstract]    
Less Than 12 Months, Fair Value 0 26,052
12 Months or Longer, Fair Value 43,127 46,415
Total, Fair Value 43,127 72,467
Unrealized Loss Position, Unrealized Losses [Abstract]    
Less Than 12 Months, Unrealized Losses 0 (49)
12 Months or Longer, Unrealized Losses (951) (1,916)
Total, Unrealized Losses $ (951) $ (1,965)
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 2
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 6
Collateralized Mortgage Obligations [Member] | Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]    
Schedule of Held-to-maturity Securities [Line Items]    
Amortized cost $ 282,966 $ 317,628
Unrealized gains 4,081 1,934
Unrealized losses (951) (1,965)
Estimated fair value 286,096 317,597
Held-to-maturity Securities, Debt Maturities, Net Carrying Amount [Abstract]    
Amortized cost 282,966 317,628
Held-to-maturity Securities, Debt Maturities, Fair Value [Abstract]    
Total, Fair Value $ 286,096 $ 317,597