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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,255,874 $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale 23,264 33,776
Gross Unrealized Holding Loss, Available-for-sale (8,672) (2,845)
Fair Value, Available-for-sale $ 2,270,466 $ 2,368,646
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 911,676 $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity 1,138 4,796
Gross Unrealized Holding Loss, Held-to-maturity (15,440) (2,746)
Fair Value, Held-to-maturity $ 897,374 $ 853,039
Total Percent, Held-to-maturity 100.00% 100.00%
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 345,313 $ 380,166
Gross Unrealized Holding Gain, Available-for-sale 3,361 4,689
Gross Unrealized Holding Loss, Available-for-sale (1,485) (1,074)
Fair Value, Available-for-sale $ 347,189 $ 383,781
Total Percent, Available-for-sale 15.29% 16.20%
Amortized Cost, Held-to-maturity $ 244,419 $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity   569
Gross Unrealized Holding Loss, Held-to-maturity (6,808)  
Fair Value, Held-to-maturity $ 237,611 $ 1,853
Total Percent, Held-to-maturity 26.81% 0.15%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,750 $ 5,752
Gross Unrealized Holding Gain, Available-for-sale 2  
Gross Unrealized Holding Loss, Available-for-sale   (7)
Fair Value, Available-for-sale $ 2,752 $ 5,745
Total Percent, Available-for-sale 0.12% 0.24%
Amortized Cost, Held-to-maturity $ 182,648 $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity 362 1,176
Gross Unrealized Holding Loss, Held-to-maturity (1,972) (734)
Fair Value, Held-to-maturity $ 181,038 $ 293,780
Total Percent, Held-to-maturity 20.03% 34.47%
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,822,168 $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale 18,812 26,001
Gross Unrealized Holding Loss, Available-for-sale (6,232) (1,761)
Fair Value, Available-for-sale $ 1,834,748 $ 1,813,097
Total Percent, Available-for-sale 80.81% 76.55%
Amortized Cost, Held-to-maturity $ 193,699 $ 232,053
Gross Unrealized Holding Loss, Held-to-maturity (1,892) (1,293)
Fair Value, Held-to-maturity $ 191,807 $ 230,760
Total Percent, Held-to-maturity 21.25% 27.27%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 80,137 $ 157,940
Gross Unrealized Holding Gain, Available-for-sale 889 3,036
Gross Unrealized Holding Loss, Available-for-sale (955) (3)
Fair Value, Available-for-sale $ 80,071 $ 160,973
Total Percent, Available-for-sale 3.53% 6.80%
Amortized Cost, Held-to-maturity $ 290,910 $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity 776 3,051
Gross Unrealized Holding Loss, Held-to-maturity (4,768) (719)
Fair Value, Held-to-maturity $ 286,918 $ 326,646
Total Percent, Held-to-maturity 31.91% 38.11%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 5,506 $ 5,000
Gross Unrealized Holding Gain, Available-for-sale 200 50
Fair Value, Available-for-sale $ 5,706 $ 5,050
Total Percent, Available-for-sale 0.25% 0.21%