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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,165,551 $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale 62,113 33,776
Gross Unrealized Holding Loss, Available-for-sale (113) (2,845)
Fair Value, Available-for-sale $ 2,227,551 $ 2,368,646
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 878,953 $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity 16,401 4,796
Gross Unrealized Holding Loss, Held-to-maturity (1,648) (2,746)
Fair Value, Held-to-maturity $ 893,706 $ 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 $ 376,529 $ 380,166
Gross Unrealized Holding Gain, Available-for-sale 6,679 4,689
Gross Unrealized Holding Loss, Available-for-sale (112) (1,074)
Fair Value, Available-for-sale $ 383,096 $ 383,781
Total Percent, Available-for-sale 17.20% 16.20%
Amortized Cost, Held-to-maturity $ 192,680 $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity 195 569
Gross Unrealized Holding Loss, Held-to-maturity (325) 0
Fair Value, Held-to-maturity $ 192,550 $ 1,853
Total Percent, Held-to-maturity 21.92% 0.15%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 3,750 $ 5,752
Gross Unrealized Holding Gain, Available-for-sale 7 0
Gross Unrealized Holding Loss, Available-for-sale 0 (7)
Fair Value, Available-for-sale $ 3,757 $ 5,745
Total Percent, Available-for-sale 0.17% 0.24%
Amortized Cost, Held-to-maturity $ 181,840 $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity 5,038 1,176
Gross Unrealized Holding Loss, Held-to-maturity (25) (734)
Fair Value, Held-to-maturity $ 186,853 $ 293,780
Total Percent, Held-to-maturity 20.69% 34.47%
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,684,735 $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale 52,941 26,001
Gross Unrealized Holding Loss, Available-for-sale 0 (1,761)
Fair Value, Available-for-sale $ 1,737,676 $ 1,813,097
Total Percent, Available-for-sale 78.01% 76.55%
Amortized Cost, Held-to-maturity $ 204,791 $ 232,053
Gross Unrealized Holding Gain, Held-to-maturity 5,811 0
Gross Unrealized Holding Loss, Held-to-maturity 0 (1,293)
Fair Value, Held-to-maturity $ 210,602 $ 230,760
Total Percent, Held-to-maturity 23.30% 27.27%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 95,537 $ 157,940
Gross Unrealized Holding Gain, Available-for-sale 1,998 3,036
Gross Unrealized Holding Loss, Available-for-sale (1) (3)
Fair Value, Available-for-sale $ 97,534 $ 160,973
Total Percent, Available-for-sale 4.38% 6.80%
Amortized Cost, Held-to-maturity $ 299,642 $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity 5,357 3,051
Gross Unrealized Holding Loss, Held-to-maturity (1,298) (719)
Fair Value, Held-to-maturity $ 303,701 $ 326,646
Total Percent, Held-to-maturity 34.09% 38.11%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 5,000 $ 5,000
Gross Unrealized Holding Gain, Available-for-sale 488 50
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 5,488 $ 5,050
Total Percent, Available-for-sale 0.24% 0.21%