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Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,251,275 $ 2,255,874
Gross Unrealized Holding Gain, Available-for-sale 24,142 23,264
Gross Unrealized Holding Loss, Available-for-sale (5,907) (8,672)
Fair Value, Available-for-sale $ 2,269,510 $ 2,270,466
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 869,769 $ 911,676
Gross Unrealized Holding Gain, Held-to-maturity 4,418 1,138
Gross Unrealized Holding Loss, Held-to-maturity (11,702) (15,440)
Fair Value, Held-to-maturity $ 862,485 $ 897,374
Total Percent, Held-to-maturity 100.00% 100.00%
CMO/REMIC - Residential [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 312,024 $ 345,313
Gross Unrealized Holding Gain, Available-for-sale 3,045 3,361
Gross Unrealized Holding Loss, Available-for-sale (951) (1,485)
Fair Value, Available-for-sale $ 314,118 $ 347,189
Total Percent, Available-for-sale 13.84% 15.29%
Amortized Cost, Held-to-maturity $ 234,003 $ 244,419
Gross Unrealized Holding Gain, Held-to-maturity 0 0
Gross Unrealized Holding Loss, Held-to-maturity (6,611) (6,808)
Fair Value, Held-to-maturity $ 227,392 $ 237,611
Total Percent, Held-to-maturity 26.90% 26.81%
Government Agency/GSE [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,750 $ 2,750
Gross Unrealized Holding Gain, Available-for-sale 0 2
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 1,750 $ 2,752
Total Percent, Available-for-sale 0.08% 0.12%
Amortized Cost, Held-to-maturity $ 169,942 $ 182,648
Gross Unrealized Holding Gain, Held-to-maturity 1,108 362
Gross Unrealized Holding Loss, Held-to-maturity (1,361) (1,972)
Fair Value, Held-to-maturity $ 169,689 $ 181,038
Total Percent, Held-to-maturity 19.54% 20.03%
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,866,602 $ 1,822,168
Gross Unrealized Holding Gain, Available-for-sale 20,302 18,812
Gross Unrealized Holding Loss, Available-for-sale (4,601) (6,232)
Fair Value, Available-for-sale $ 1,882,303 $ 1,834,748
Total Percent, Available-for-sale 82.94% 80.81%
Amortized Cost, Held-to-maturity $ 185,401 $ 193,699
Gross Unrealized Holding Gain, Held-to-maturity 676 0
Gross Unrealized Holding Loss, Held-to-maturity (393) (1,892)
Fair Value, Held-to-maturity $ 185,684 $ 191,807
Total Percent, Held-to-maturity 21.32% 21.25%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 70,209 $ 80,137
Gross Unrealized Holding Gain, Available-for-sale 795 889
Gross Unrealized Holding Loss, Available-for-sale (355) (955)
Fair Value, Available-for-sale $ 70,649 $ 80,071
Total Percent, Available-for-sale 3.11% 3.53%
Amortized Cost, Held-to-maturity $ 280,423 $ 290,910
Gross Unrealized Holding Gain, Held-to-maturity 2,634 776
Gross Unrealized Holding Loss, Held-to-maturity (3,337) (4,768)
Fair Value, Held-to-maturity $ 279,720 $ 286,918
Total Percent, Held-to-maturity 32.24% 31.91%
Other Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 690 $ 5,506
Gross Unrealized Holding Gain, Available-for-sale 0 200
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 690 $ 5,706
Total Percent, Available-for-sale 0.03% 0.25%