XML 44 R33.htm IDEA: XBRL DOCUMENT v3.4.0.3
Investment Securities - Summary of Amortized Cost and Estimated Fair Value of Investment Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 2,235,684 $ 2,337,715
Gross Unrealized Holding Gain, Available-for-sale 59,034 33,776
Gross Unrealized Holding Loss, Available-for-sale (59) (2,845)
Fair Value, Available-for-sale $ 2,294,659 $ 2,368,646
Total Percent, Available-for-sale 100.00% 100.00%
Amortized Cost, Held-to-maturity $ 812,893 $ 850,989
Gross Unrealized Holding Gain, Held-to-maturity 14,059 4,796
Gross Unrealized Holding Loss, Held-to-maturity (1,024) (2,746)
Fair Value, Held-to-maturity $ 825,928 $ 853,039
Total Percent, Held-to-maturity 100.00% 100.00%
CMO's/REMIC's - Residential [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 360,790 $ 380,166
Gross Unrealized Holding Gain, Available-for-sale 7,745 4,689
Gross Unrealized Holding Loss, Available-for-sale 0 (1,074)
Fair Value, Available-for-sale $ 368,535 $ 383,781
Total Percent, Available-for-sale 16.06% 16.20%
Amortized Cost, Held-to-maturity $ 1,226 $ 1,284
Gross Unrealized Holding Gain, Held-to-maturity 499 569
Gross Unrealized Holding Loss, Held-to-maturity 0 0
Fair Value, Held-to-maturity $ 1,725 $ 1,853
Total Percent, Held-to-maturity 0.15% 0.15%
Government Agency/GSEs [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 5,750 $ 5,752
Gross Unrealized Holding Gain, Available-for-sale 10 0
Gross Unrealized Holding Loss, Available-for-sale 0 (7)
Fair Value, Available-for-sale $ 5,760 $ 5,745
Total Percent, Available-for-sale 0.25% 0.24%
Amortized Cost, Held-to-maturity $ 272,934 $ 293,338
Gross Unrealized Holding Gain, Held-to-maturity 5,687 1,176
Gross Unrealized Holding Loss, Held-to-maturity 0 (734)
Fair Value, Held-to-maturity $ 278,621 $ 293,780
Total Percent, Held-to-maturity 33.58% 34.47%
Residential Mortgage-backed Securities [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 1,710,383 $ 1,788,857
Gross Unrealized Holding Gain, Available-for-sale 48,667 26,001
Gross Unrealized Holding Loss, Available-for-sale 0 (1,761)
Fair Value, Available-for-sale $ 1,759,050 $ 1,813,097
Total Percent, Available-for-sale 76.66% 76.55%
Amortized Cost, Held-to-maturity $ 225,079 $ 232,053
Gross Unrealized Holding Gain, Held-to-maturity 3,085 0
Gross Unrealized Holding Loss, Held-to-maturity 0 (1,293)
Fair Value, Held-to-maturity $ 228,164 $ 230,760
Total Percent, Held-to-maturity 27.69% 27.27%
Municipal Bonds [Member]    
Schedule of Investments [Line Items]    
Amortized Cost, Available-for-sale $ 153,761 $ 157,940
Gross Unrealized Holding Gain, Available-for-sale 2,523 3,036
Gross Unrealized Holding Loss, Available-for-sale (59) (3)
Fair Value, Available-for-sale $ 156,225 $ 160,973
Total Percent, Available-for-sale 6.81% 6.80%
Amortized Cost, Held-to-maturity $ 313,654 $ 324,314
Gross Unrealized Holding Gain, Held-to-maturity 4,788 3,051
Gross Unrealized Holding Loss, Held-to-maturity (1,024) (719)
Fair Value, Held-to-maturity $ 317,418 $ 326,646
Total Percent, Held-to-maturity 38.58% 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 89 50
Gross Unrealized Holding Loss, Available-for-sale 0 0
Fair Value, Available-for-sale $ 5,089 $ 5,050
Total Percent, Available-for-sale 0.22% 0.21%