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Summary of Portfolio of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 3,081,676 [1] $ 105,567
Gross Unrealized Gain 102,937 [1] 1,980
Gross Unrealized Loss 13,496 [1] 3,266
Fair Value 3,171,117 [1] 104,281
Mortgage-Related Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 2,540,172  
Gross Unrealized Gain 85,090  
Gross Unrealized Loss 1,014  
Fair Value 2,624,248  
Mortgage-Related Securities | GSE certificates    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,941,943 [2] 7,786
Gross Unrealized Gain [2] 61,714  
Gross Unrealized Loss 1,014 [2] 460
Fair Value 2,002,643 [2] 7,326
Mortgage-Related Securities | GSE CMOs    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost [3] 598,229  
Gross Unrealized Gain [3] 23,376  
Fair Value [3] 621,605  
Other Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 541,504 97,781
Gross Unrealized Gain 17,847 1,980
Gross Unrealized Loss 12,482 2,806
Fair Value 546,869 96,955
Other Securities | Municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 71,339 583
Gross Unrealized Gain 113 48
Gross Unrealized Loss 939  
Fair Value 70,513 631
Other Securities | Capital trust notes    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 75,206 9,458
Gross Unrealized Gain 2,538 2
Gross Unrealized Loss 11,319 2,217
Fair Value 66,425 7,243
Other Securities | Preferred Stock (Par Value: $0.01):    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 15,293 70,866
Gross Unrealized Gain 142 1,446
Gross Unrealized Loss   328
Fair Value 15,435 71,984
Other Securities | Mutual Funds and Common Stock    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 16,874 [4] 16,874
Gross Unrealized Gain 471 [4] 484
Gross Unrealized Loss 195 [4] 261
Fair Value 17,150 [4] $ 17,097
Other Securities | U.S. Treasury obligations    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 200,021  
Gross Unrealized Loss 29  
Fair Value 199,992  
Other Securities | GSE debentures    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 88,315  
Gross Unrealized Gain 2,919  
Fair Value 91,234  
Other Securities | Corporate bonds    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 74,456  
Gross Unrealized Gain 11,664  
Fair Value $ 86,120  
[1] The amortized cost includes the non-credit portion of OTTI recorded in AOCL. At June 30, 2017, the non-credit portion of OTTI recorded in AOCL was $8.6 million (before taxes).
[2] Government-sponsored enterprise.
[3] Collateralized mortgage obligations.
[4] Primarily consists of mutual funds that are Community Reinvestment Act-qualified investments.