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Loans, Impaired (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Dec. 31, 2011
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | $ 65,734 | $ 64,297
Recorded Investment With No Allowance | 24,479 | 19,298
Recorded Investment With Allowance | 31,567 | 35,400
Recorded Investment in Impaired Loans | 56,046 | 54,698
Related Allowance | 4,317 | 4,797
Average Outstanding Impaired Loans | 50,169 | 49,307
Real Estate Loans - Construction and land development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 28,750 | 28,721
Recorded Investment With No Allowance | 12,377 | 14,484
Recorded Investment With Allowance | 7,960 | 6,098
Recorded Investment in Impaired Loans | 20,337 | 20,582
Related Allowance | 2,470 | 3,264
Average Outstanding Impaired Loans | 14,990 | 17,848
Real Estate Loans - Single-family residential [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 29,103 | 26,382
Recorded Investment With No Allowance | 5,475 | 969
Recorded Investment With Allowance | 22,927 | 24,719
Recorded Investment in Impaired Loans | 28,402 | 25,688
Related Allowance | 1,533 | 1,427
Average Outstanding Impaired Loans | 28,841 | 25,102
Real estate loans - Commercial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 6,250 | 7,717
Recorded Investment With No Allowance | 5,018 | 3,845
Recorded Investment With Allowance | 663 | 3,139
Recorded Investment in Impaired Loans | 5,681 | 6,984
Related Allowance | 299 | 77
Average Outstanding Impaired Loans | 4,872 | 4,518
Real Estate Loans - Multifamily and farmland [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 201 | 209
Recorded Investment With No Allowance | 201 | 0
Recorded Investment With Allowance | 0 | 209
Recorded Investment in Impaired Loans | 201 | 209
Related Allowance | 0 | 1
Average Outstanding Impaired Loans | 202 | 214
Total impaired real estate loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 64,304 | 63,029
Recorded Investment With No Allowance | 23,071 | 19,298
Recorded Investment With Allowance | 31,550 | 34,165
Recorded Investment in Impaired Loans | 54,621 | 53,463
Related Allowance | 4,302 | 4,769
Average Outstanding Impaired Loans | 48,905 | 47,682
Commercial (not secured by real estate) [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 1,408 | 1,111
Recorded Investment With No Allowance | 1,408 | 0
Recorded Investment With Allowance | 0 | 1,083
Recorded Investment in Impaired Loans | 1,408 | 1,083
Related Allowance | 15 | 26
Average Outstanding Impaired Loans | 1,222 | 1,485
Consumer loans (not secured by real estate) [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Contractual Principal Balance | 22 | 157
Recorded Investment With No Allowance | 0 | 0
Recorded Investment With Allowance | 17 | 152
Recorded Investment in Impaired Loans | 17 | 152
Related Allowance | 0 | 2
Average Outstanding Impaired Loans | $ 42 | $ 140

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