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Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Dec. 31, 2011
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $ 52,828 |  | $ 57,374
Unpaid Contractual Principal Balance With An Allowance Recorded | 28,266 |  | 26,317
Unpaid Contractual Principal Balance, Total | 81,094 |  | 83,691
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 44,171 | 47,487 | 46,270
Impaired Balance With An Allowance Recorded | 22,536 | 24,978 | 23,002
Impaired Balance, Total | 66,707 | 72,465 | 69,272
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 4,741 | 4,950 | 5,751
Related Allowance, Total | 4,741 | 4,950 | 5,751
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 47,667 | 38,673 | 45,234
Average Recorded Investment With An Allowance Recorded | 20,870 | 21,643 | 21,188
Average Recorded Investment, Total | 68,537 | 60,316 | 66,422
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 481 | 373 | 1,171
Interest Income Recognized With An Allowance Recorded | 103 | 297 | 291
Interest Income Recognized, Total | 584 | 670 | 1,462
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 460 | 462 | 1,203
Interest Income Collected With An Allowance Recorded | 103 | 376 | 375
Interest Income Collected, Total | 563 | 838 | 1,578
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 1,546 |  | 1,743
Unpaid Contractual Principal Balance With An Allowance Recorded | 290 |  | 775
Unpaid Contractual Principal Balance, Total | 1,836 |  | 2,518
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 1,456 | 373 | 1,580
Impaired Balance With An Allowance Recorded | 290 | 0 | 776
Impaired Balance, Total | 1,746 | 373 | 2,356
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 300 | 0 | 308
Related Allowance, Total | 300 | 0 | 308
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 1,568 | 282 | 947
Average Recorded Investment With An Allowance Recorded | 300 | 10 | 214
Average Recorded Investment, Total | 1,868 | 292 | 1,161
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 49 | 7 | 60
Interest Income Recognized With An Allowance Recorded | 2 | 0 | 15
Interest Income Recognized, Total | 51 | 7 | 75
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 40 | 14 | 65
Interest Income Collected With An Allowance Recorded | 5 | 0 | 19
Interest Income Collected, Total | 45 | 14 | 84
Commercial Construction [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 11,998 |  | 17,699
Unpaid Contractual Principal Balance With An Allowance Recorded | 17,961 |  | 14,036
Unpaid Contractual Principal Balance, Total | 29,959 |  | 31,735
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 9,694 | 13,485 | 12,799
Impaired Balance With An Allowance Recorded | 12,966 | 12,418 | 11,489
Impaired Balance, Total | 22,660 | 25,903 | 24,288
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 2,111 | 2,965 | 2,693
Related Allowance, Total | 2,111 | 2,965 | 2,693
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 11,079 | 10,642 | 13,310
Average Recorded Investment With An Allowance Recorded | 11,954 | 10,198 | 10,470
Average Recorded Investment, Total | 23,033 | 20,840 | 23,780
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | (7) | 41 | 116
Interest Income Recognized With An Allowance Recorded | 0 | 58 | 14
Interest Income Recognized, Total | (7) | 99 | 130
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 4 | 67 | 144
Interest Income Collected With An Allowance Recorded | 0 | 101 | 61
Interest Income Collected, Total | 4 | 168 | 205
Commercial Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 33,857 |  | 34,686
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,163 |  | 6,430
Unpaid Contractual Principal Balance, Total | 39,020 |  | 41,116
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 28,254 | 28,744 | 29,385
Impaired Balance With An Allowance Recorded | 5,141 | 7,072 | 6,430
Impaired Balance, Total | 33,395 | 35,816 | 35,815
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,462 | 1,473 | 2,061
Related Allowance, Total | 1,462 | 1,473 | 2,061
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 30,136 | 23,436 | 27,027
Average Recorded Investment With An Allowance Recorded | 4,394 | 8,372 | 6,557
Average Recorded Investment, Total | 34,530 | 31,808 | 33,584
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 358 | 251 | 833
Interest Income Recognized With An Allowance Recorded | 55 | 114 | 182
Interest Income Recognized, Total | 413 | 365 | 1,015
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 325 | 261 | 834
Interest Income Collected With An Allowance Recorded | 53 | 151 | 197
Interest Income Collected, Total | 378 | 412 | 1,031
Residential Real Estate [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,748 |  | 2,601
Unpaid Contractual Principal Balance With An Allowance Recorded | 4,852 |  | 4,772
Unpaid Contractual Principal Balance, Total | 7,600 |  | 7,373
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,152 | 4,277 | 1,934
Impaired Balance With An Allowance Recorded | 4,139 | 5,488 | 4,042
Impaired Balance, Total | 6,291 | 9,765 | 5,976
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 868 | 512 | 675
Related Allowance, Total | 868 | 512 | 675
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,280 | 3,517 | 3,176
Average Recorded Investment With An Allowance Recorded | 4,092 | 3,024 | 3,859
Average Recorded Investment, Total | 6,372 | 6,541 | 7,035
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 46 | 32 | 88
Interest Income Recognized With An Allowance Recorded | 46 | 125 | 97
Interest Income Recognized, Total | 92 | 157 | 185
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 42 | 49 | 80
Interest Income Collected With An Allowance Recorded | 45 | 124 | 97
Interest Income Collected, Total | 87 | 173 | 177
Farmland [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 2,340 |  | 278
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 299
Unpaid Contractual Principal Balance, Total | 2,340 |  | 577
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 2,297 | 211 | 227
Impaired Balance With An Allowance Recorded | 0 |  | 260
Impaired Balance, Total | 2,297 | 211 | 487
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 |  | 12
Related Allowance, Total | 0 | 0 | 12
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,297 | 328 | 342
Average Recorded Investment With An Allowance Recorded | 130 |  | 65
Average Recorded Investment, Total | 2,427 | 328 | 407
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 32 | 66 | 66
Interest Income Recognized With An Allowance Recorded | 0 |  | (18)
Interest Income Recognized, Total | 32 | 66 | 48
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 44 | 66 | 66
Interest Income Collected With An Allowance Recorded | 0 |  | 0
Interest Income Collected, Total | 44 | 66 | 66
Agricultural [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 45 |  | 86
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  |
Unpaid Contractual Principal Balance, Total | 45 |  | 86
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 45 | 196 | 86
Impaired Balance With An Allowance Recorded | 0 |  |
Impaired Balance, Total | 45 | 196 | 86
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 |  |
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 42 | 254 | 208
Average Recorded Investment With An Allowance Recorded | 0 |  |
Average Recorded Investment, Total | 42 | 254 | 208
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | (28) | (4)
Interest Income Recognized With An Allowance Recorded | 0 |  |
Interest Income Recognized, Total | 0 | (28) | (4)
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | 0
Interest Income Collected With An Allowance Recorded | 0 |  |
Interest Income Collected, Total | 0 | 0 | 0
Consumer [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 256 |  | 229
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 5
Unpaid Contractual Principal Balance, Total | 256 |  | 234
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 237 | 158 | 216
Impaired Balance With An Allowance Recorded | 0 |  | 5
Impaired Balance, Total | 237 | 158 | 221
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 |  | 2
Related Allowance, Total | 0 | 0 | 2
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 225 | 181 | 184
Average Recorded Investment With An Allowance Recorded | 0 |  | 4
Average Recorded Investment, Total | 225 | 181 | 188
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 3 | 3 | 11
Interest Income Recognized With An Allowance Recorded | 0 |  | 1
Interest Income Recognized, Total | 3 | 3 | 12
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 5 | 4 | 12
Interest Income Collected With An Allowance Recorded | 0 |  | 1
Interest Income Collected, Total | 5 | 4 | 13
Other [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 38 |  | 52
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 38 |  | 52
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 36 | 43 | 43
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 36 | 43 | 43
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 40 | 33 | 40
Average Recorded Investment With An Allowance Recorded | 0 | 39 | 19
Average Recorded Investment, Total | 40 | 72 | 59
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 1 | 1
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 1 | 1
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 1 | 2
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | $ 0 | $ 1 | $ 2

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- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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