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Loans (Estimated Details On Loans Acquisition) (Details) (Charter National [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Charter National [Member]
 
Loans [Line Items]  
Contractually required payments including interest $ 40,475
Less: Nonaccretable difference 11,855
Cash flows expected to be collected 28,620 [1]
Less: Accretable yield 2,288
Fair value of loans acquired with evidence of credit quality deterioration since origination $ 26,332
[1] Represents undiscounted expected principal and interest cash flows at acquisition.