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Loans (Estimated Details On Loans Acquisition) (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 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
First United Bank [Member]
 
Loans [Line Items]  
Contractually required payments including interest 152,937
Less: Nonaccretable difference 79,492
Cash flows expected to be collected 73,445 [1]
Less: Accretable yield 6,052
Fair value of loans acquired with evidence of credit quality deterioration since origination $ 67,393
[1] Represents undiscounted expected principal and interest cash flows at acquisition.