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Loans, Impaired (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | $ 67,000 | $ 64,297
Recorded Investment With No Allowance | 26,325 | 19,298
Recorded Investment With Allowance | 31,170 | 35,400
Recorded Investment in Impaired Loans | 57,495 | 54,698
Related Allowance | 3,278 | 4,797
Average Outstanding Impaired Loans | 49,417 | 49,307
Real Estate Loans - Construction and land development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 28,090 | 28,721
Recorded Investment With No Allowance | 12,832 | 14,484
Recorded Investment With Allowance | 7,437 | 6,098
Recorded Investment in Impaired Loans | 20,269 | 20,582
Related Allowance | 1,821 | 3,264
Average Outstanding Impaired Loans | 13,806 | 17,848
Real Estate Loans - Single-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 29,652 | 26,382
Recorded Investment With No Allowance | 5,193 | 969
Recorded Investment With Allowance | 23,416 | 24,719
Recorded Investment in Impaired Loans | 28,609 | 25,688
Related Allowance | 1,343 | 1,427
Average Outstanding Impaired Loans | 28,620 | 25,102
Real estate loans - Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 7,903 | 7,717
Recorded Investment With No Allowance | 6,953 | 3,845
Recorded Investment With Allowance | 317 | 3,139
Recorded Investment in Impaired Loans | 7,270 | 6,984
Related Allowance | 114 | 77
Average Outstanding Impaired Loans | 5,565 | 4,518
Real Estate Loans - Multifamily and farmland [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 200 | 209
Recorded Investment With No Allowance | 200 | 0
Recorded Investment With Allowance | 0 | 209
Recorded Investment in Impaired Loans | 200 | 209
Related Allowance | 0 | 1
Average Outstanding Impaired Loans | 201 | 214
Total impaired real estate loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 65,845 | 63,029
Recorded Investment With No Allowance | 25,178 | 19,298
Recorded Investment With Allowance | 31,170 | 34,165
Recorded Investment in Impaired Loans | 56,348 | 53,463
Related Allowance | 3,278 | 4,769
Average Outstanding Impaired Loans | 48,192 | 47,682
Commercial (not secured by real estate) [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 1,155 | 1,111
Recorded Investment With No Allowance | 1,117 | 0
Recorded Investment With Allowance | 0 | 1,083
Recorded Investment in Impaired Loans | 1,117 | 1,083
Related Allowance | 0 | 26
Average Outstanding Impaired Loans | 1,187 | 1,485
Consumer loans (not secured by real estate) [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 0 | 157
Recorded Investment With No Allowance | 30 | 0
Recorded Investment With Allowance | 0 | 152
Recorded Investment in Impaired Loans | 30 | 152
Related Allowance | 0 | 2
Average Outstanding Impaired Loans | $ 38 | $ 140

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