XML 52 R39.htm IDEA: XBRL DOCUMENT v3.4.0.3
Investment Securities - Analysis of Amortized Cost and Estimated Fair Values of Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Investment Securities [Line Items]    
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis $ 2,601  
Amortized Cost 884,679 $ 891,111
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 16,924 11,926
Gross Unrealized Losses (11,405) (16,477)
Securities available for sale, at fair value 890,198 886,560
Due within one year, Estimated Fair Value 2,601  
Due after one but within five years, Amortized Cost 20,596  
Due after one but within five years, Estimated Fair Value 20,640  
Due after five but within ten years, Amortized Cost 27,068  
Due after five but within ten years, Estimated Fair Value 27,832  
Due after ten years, Amortized Cost 44,400  
Due after ten years, Estimated Fair Value 35,571  
Due within one year, Amortized Cost 94,665  
Available-for-sale Securities, Debt Maturities, Single Maturity Date 86,644  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis [1] 787,808  
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value [1] 801,348  
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 19,380  
Securities available for sale, at fair value 21,700 22,092
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 779,625 777,577
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 23 28
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 19,203 19,118
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 27,832 27,598
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 6,336 2,319
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Securities available for sale, at fair value 33,273 35,658
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 882,473  
Securities available for sale, at fair value 887,992  
Equity Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 2,206 2,170
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 2,206 2,170
Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 882,473 888,941
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 16,924 11,926
Gross Unrealized Losses (11,405) (16,477)
Securities available for sale, at fair value 887,992 884,390
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Investment Securities [Line Items]    
Amortized Cost 42,500 42,239
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 476 916
Gross Unrealized Losses (9,703) (7,497)
Securities available for sale, at fair value 33,273 35,658
Corporate Debt Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 5,896 1,897
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 440 422
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 6,336 2,319
Obligations of States and Political Subdivisions [Member]    
Investment Securities [Line Items]    
Amortized Cost 27,068 27,066
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 764 532
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 27,832 27,598
Obligations of U.S. Government-Sponsored Enterprises - Other Government-Sponsored Enterprises [Member]    
Investment Securities [Line Items]    
Amortized Cost 19,201 19,201
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 7 2
Gross Unrealized Losses 5 (85)
Securities available for sale, at fair value 19,203 19,118
Obligations of U.S. Government-Sponsored Enterprises - Mortgage-Backed Securities - Commercial [Member]    
Investment Securities [Line Items]    
Amortized Cost 23 28
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Gross Unrealized Losses 0 0
Securities available for sale, at fair value 23 28
Residential Mortgage Backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 768,405 778,476
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 12,917 7,983
Gross Unrealized Losses 1,697 (8,882)
Securities available for sale, at fair value 779,625 777,577
US Government Agencies Residential Mortgage-backed Securities [Member]    
Investment Securities [Line Items]    
Amortized Cost 19,380 20,034
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,320 2,071
Gross Unrealized Losses 0 (13)
Securities available for sale, at fair value $ 21,700 $ 22,092
[1] Mortgage Backed Securities include an amortized cost of $19.4 million and a fair value of $21.7 million for Obligations of U.S.