Covered Assets and FDIC Loss-sharing Asset (Analysis and Allowance for Losses on Covered Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans, net	$ 4,444,842	$ 2,864,803
Covered Loans [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	341,142	500,794
Allowance for losses	20,174	30,056	4,944	6,055
Valuation discount resulting from acquisition accounting	43,297	79,401
Loans, net	277,671	391,337
Covered Loans [Member] | Commercial Portfolio Segment [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	72,870	125,373
Covered Loans [Member] | Real Estate Portfolio Segment [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	212,521	290,256
Covered Loans [Member] | Real Estate Construction Portfolio Segment [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	21,650	40,649
Covered Loans [Member] | Consumer Portfolio Segment [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	34,101	44,516
Covered Loans [Member] | One-to-Four Family Residential [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	41,642	57,150
Covered Loans [Member] | One-to-Four Family Residential Construction [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	14,781	25,398
Covered Loans [Member] | Commercial and Multifamily Residential [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	170,879	233,106
Covered Loans [Member] | Commercial and Multifamily Residential Construction [Member]
Covered Assets And FDIC Loss Sharing Asset [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 6,869	$ 15,251