Risk Categories for Loans and Leases (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Company's Risk Category [Line Items]
Loans receivable	$ 2,396,995	$ 2,446,111	$ 1,627,272
Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable	1,158,863		1,009,092
HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable	122,763		21,956
Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable	299,184		79,345
Multi-family
Company's Risk Category [Line Items]
Loans receivable	155,382		126,503
SBA
Company's Risk Category [Line Items]
Loans receivable	26,541		35,662
Construction
Company's Risk Category [Line Items]
Loans receivable	25,144		6,831
Non Traditional Mortgages
Company's Risk Category [Line Items]
Loans receivable	269,410	309,597
Non Traditional Mortgages | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	120,668	156,490
Loans receivable	120,668	156,490
Non Traditional Mortgages | Heloc First Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	143,708	147,705
Loans receivable	143,708	147,705
Non Traditional Mortgages | Heloc Second Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	4,921	5,289
Loans receivable	4,921	5,289
Non Traditional Mortgages | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	113	113
Loans receivable	113	113
Traditional Loans
Company's Risk Category [Line Items]
Loans receivable	1,814,162	1,797,228
Traditional Loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	602,448	667,526
Traditional Loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	115,973	108,888
Traditional Loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	297,646	283,743
Traditional Loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	545,968	514,869
Traditional Loans | Multi-family
Company's Risk Category [Line Items]
Loans receivable, Commercial	155,382	141,580
Traditional Loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	23,064	23,740
Traditional Loans | Construction
Company's Risk Category [Line Items]
Loans receivable, Commercial	25,144	24,933
Traditional Loans | Leases financing
Company's Risk Category [Line Items]
Loans receivable, Commercial	48,537	31,949
Purchased loans
Company's Risk Category [Line Items]
Loans receivable	313,423	339,286
Purchased loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	292,039	314,820
Purchased loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	1,756	1,736
Purchased loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	1,538	4,028
Purchased loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	14,613	15,014
Purchased loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	3,477	3,688
Pass
Company's Risk Category [Line Items]
Loans receivable	2,026,683	2,057,879
Pass | Non Traditional Mortgages
Company's Risk Category [Line Items]
Loans receivable	247,851	286,593
Pass | Non Traditional Mortgages | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	116,622	151,728
Pass | Non Traditional Mortgages | Heloc First Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	126,407	129,679
Pass | Non Traditional Mortgages | Heloc Second Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	4,709	5,073
Pass | Non Traditional Mortgages | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	113	113
Pass | Traditional Loans
Company's Risk Category [Line Items]
Loans receivable	1,768,943	1,760,294
Pass | Traditional Loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	568,708	640,701
Pass | Traditional Loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	115,831	108,745
Pass | Traditional Loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	295,194	280,527
Pass | Traditional Loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	539,043	510,117
Pass | Traditional Loans | Multi-family
Company's Risk Category [Line Items]
Loans receivable, Commercial	153,446	139,608
Pass | Traditional Loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	23,040	23,714
Pass | Traditional Loans | Construction
Company's Risk Category [Line Items]
Loans receivable, Commercial	25,144	24,933
Pass | Traditional Loans | Leases financing
Company's Risk Category [Line Items]
Loans receivable, Commercial	48,537	31,949
Pass | Purchased loans
Company's Risk Category [Line Items]
Loans receivable	9,889	10,992
Pass | Purchased loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	9,156	10,148
Pass | Purchased loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	733	844
Special Mention
Company's Risk Category [Line Items]
Loans receivable	25,407	21,824
Special Mention | Non Traditional Mortgages
Company's Risk Category [Line Items]
Loans receivable	12,826	13,791
Special Mention | Non Traditional Mortgages | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	2,008	2,321
Special Mention | Non Traditional Mortgages | Heloc First Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	10,818	11,470
Special Mention | Traditional Loans
Company's Risk Category [Line Items]
Loans receivable	11,034	6,459
Special Mention | Traditional Loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	8,662	6,350
Special Mention | Traditional Loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	109	108
Special Mention | Traditional Loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial		1
Special Mention | Traditional Loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	2,263
Special Mention | Purchased loans
Company's Risk Category [Line Items]
Loans receivable	1,547	1,574
Special Mention | Purchased loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	948	969
Special Mention | Purchased loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	599	605
Substandard
Company's Risk Category [Line Items]
Loans receivable	53,137	51,873
Substandard | Non Traditional Mortgages
Company's Risk Category [Line Items]
Loans receivable	8,733	9,213
Substandard | Non Traditional Mortgages | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	2,038	2,441
Substandard | Non Traditional Mortgages | Heloc First Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	6,483	6,556
Substandard | Non Traditional Mortgages | Heloc Second Liens
Company's Risk Category [Line Items]
Loans receivable, Consumer	212	216
Substandard | Traditional Loans
Company's Risk Category [Line Items]
Loans receivable	34,185	30,473
Substandard | Traditional Loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	25,078	20,475
Substandard | Traditional Loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	33	33
Substandard | Traditional Loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	2,452	3,215
Substandard | Traditional Loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	4,662	4,752
Substandard | Traditional Loans | Multi-family
Company's Risk Category [Line Items]
Loans receivable, Commercial	1,936	1,972
Substandard | Traditional Loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	24	26
Substandard | Purchased loans
Company's Risk Category [Line Items]
Loans receivable	10,219	12,187
Substandard | Purchased loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	271	287
Substandard | Purchased loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer	1,756	1,736
Substandard | Purchased loans | Commercial and industrial
Company's Risk Category [Line Items]
Loans receivable, Commercial	590	3,059
Substandard | Purchased loans | Real estate mortgage
Company's Risk Category [Line Items]
Loans receivable, Commercial	5,457	4,866
Substandard | Purchased loans | SBA
Company's Risk Category [Line Items]
Loans receivable, Commercial	2,145	2,239
Doubtful
Company's Risk Category [Line Items]
Loans receivable		2
Doubtful | Traditional Loans
Company's Risk Category [Line Items]
Loans receivable		2
Doubtful | Traditional Loans | HELOC, home equity loans, and other consumer credit
Company's Risk Category [Line Items]
Loans receivable, Consumer		2
Not Rated
Company's Risk Category [Line Items]
Loans receivable	291,768	314,533
Not Rated | Purchased loans
Company's Risk Category [Line Items]
Loans receivable	291,768	314,533
Not Rated | Purchased loans | Real estate 1-4 family first mortgage
Company's Risk Category [Line Items]
Loans receivable, Consumer	$ 291,768	$ 314,533