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Bank segment - Components of investment securities (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
issue
Dec. 31, 2017
USD ($)
issue
Available-for-sale    
Amortized cost $ 1,457,078 $ 1,421,622
Gross unrealized gains 553 1,231
Gross unrealized losses (39,141) (21,655)
Estimated fair value $ 1,418,490 $ 1,401,198
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months: Number of issues | issue 104 82
Less than 12 months: Fair value $ 855,970 $ 736,772
Less than 12 months: Amount $ (18,585) $ (7,664)
12 months or longer: Number of Issues | issue 88 85
12 months or longer: Fair value $ 516,365 $ 522,208
12 months or longer: Amount (20,556) (13,991)
Held-to-maturity Securities, Classified [Abstract]    
Amortized cost 43,450 44,515
Gross unrealized gains 0 1
Gross unrealized losses (959) (104)
Held-to-maturity investment securities $ 42,491 $ 44,412
Held-to-maturity Securities, Continuous Unrealized Loss Position    
Less Than 12 Months: Number Of Issues | issue 3 2
Less than 12 Months: Fair value $ 42,491 $ 35,744
Less than 12 Months: Amount $ (959) $ (104)
12 months or longer: Number of issues | issue 0 0
12 months or longer: Fair value $ 0 $ 0
12 months or longer: Amount 0 0
U.S. Treasury and federal agency obligations    
Available-for-sale    
Amortized cost 181,919 185,891
Gross unrealized gains 164 438
Gross unrealized losses (3,255) (2,031)
Estimated fair value $ 178,828 $ 184,298
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months: Number of issues | issue 18 15
Less than 12 months: Fair value $ 93,034 $ 83,137
Less than 12 months: Amount $ (1,424) $ (825)
12 months or longer: Number of Issues | issue 9 8
12 months or longer: Fair value $ 68,489 $ 62,296
12 months or longer: Amount (1,831) (1,206)
Mortgage-related securities- FNMA, FHLMC and GNMA    
Available-for-sale    
Amortized cost 1,259,732 1,220,304
Gross unrealized gains 389 793
Gross unrealized losses (35,886) (19,624)
Estimated fair value $ 1,224,235 $ 1,201,473
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months: Number of issues | issue 86 67
Less than 12 months: Fair value $ 762,936 $ 653,635
Less than 12 months: Amount $ (17,161) $ (6,839)
12 months or longer: Number of Issues | issue 79 77
12 months or longer: Fair value $ 447,876 $ 459,912
12 months or longer: Amount (18,725) (12,785)
Held-to-maturity Securities, Classified [Abstract]    
Amortized cost 43,450 44,515
Gross unrealized gains 0 1
Gross unrealized losses (959) (104)
Held-to-maturity investment securities $ 42,491 $ 44,412
Held-to-maturity Securities, Continuous Unrealized Loss Position    
Less Than 12 Months: Number Of Issues | issue 3 2
Less than 12 Months: Fair value $ 42,491 $ 35,744
Less than 12 Months: Amount $ (959) $ (104)
12 months or longer: Number of issues | issue 0 0
12 months or longer: Fair value $ 0 $ 0
12 months or longer: Amount 0 0
Mortgage revenue bond    
Available-for-sale    
Amortized cost 15,427 15,427
Gross unrealized gains 0 0
Gross unrealized losses 0 0
Estimated fair value $ 15,427 $ 15,427
Available-for-sale Securities, Continuous Unrealized Loss Position    
Less than 12 months: Number of issues | issue 0 0
Less than 12 months: Fair value $ 0 $ 0
Less than 12 months: Amount $ 0 $ 0
12 months or longer: Number of Issues | issue 0 0
12 months or longer: Fair value $ 0 $ 0
12 months or longer: Amount $ 0 $ 0