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Loans, Impaired Financing Receivable (Details) (USD $) In Thousands, unless otherwise specified | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $ 52,977 |  | $ 57,374
Unpaid Contractual Principal Balance With An Allowance Recorded | 24,057 |  | 26,317
Unpaid Contractual Principal Balance, Total | 77,034 |  | 83,691
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 44,699 | 57,321 | 46,270
Impaired Balance With An Allowance Recorded | 20,893 | 18,467 | 23,002
Impaired Balance, Total | 65,592 | 75,788 | 69,272
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 4,214 | 7,227 | 5,751
Related Allowance, Total | 4,214 | 7,227 | 5,751
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 46,676 | 44,889 | 45,234
Average Recorded Investment With An Allowance Recorded | 20,878 | 20,585 | 21,188
Average Recorded Investment, Total | 67,554 | 65,474 | 66,422
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 793 | 810 | 1,171
Interest Income Recognized With An Allowance Recorded | 264 | 279 | 291
Interest Income Recognized, Total | 1,057 | 1,089 | 1,462
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 837 | 931 | 1,203
Interest Income Collected With An Allowance Recorded | 262 | 317 | 375
Interest Income Collected, Total | 1,099 | 1,248 | 1,578
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 85 |  | 1,743
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,677 |  | 775
Unpaid Contractual Principal Balance, Total | 1,762 |  | 2,518
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 34 | 1,643 | 1,580
Impaired Balance With An Allowance Recorded | 1,677 | 59 | 776
Impaired Balance, Total | 1,711 | 1,702 | 2,356
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 514 | 39 | 308
Related Allowance, Total | 514 | 39 | 308
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 1,056 | 735 | 947
Average Recorded Investment With An Allowance Recorded | 759 | 27 | 214
Average Recorded Investment, Total | 1,815 | 762 | 1,161
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 4 | 39 | 60
Interest Income Recognized With An Allowance Recorded | 69 | 3 | 15
Interest Income Recognized, Total | 73 | 42 | 75
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 2 | 46 | 65
Interest Income Collected With An Allowance Recorded | 64 | 3 | 19
Interest Income Collected, Total | 66 | 49 | 84
Agricultural [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 109 |  | 86
Unpaid Contractual Principal Balance, Total | 109 |  | 86
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 109 | 238 | 86
Impaired Balance, Total | 109 | 238 | 86
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance, Total | 0 | 0 | 0
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 64 | 249 | 208
Average Recorded Investment, Total | 64 | 249 | 208
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 8 | (29) | (4)
Interest Income Recognized, Total | 8 | (29) | (4)
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 18 | 0 | 0
Interest Income Collected, Total | 18 | 0 | 0
Commercial Construction [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 10,527 |  | 17,699
Unpaid Contractual Principal Balance With An Allowance Recorded | 12,331 |  | 14,036
Unpaid Contractual Principal Balance, Total | 22,858 |  | 31,735
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 8,205 | 19,155 | 12,799
Impaired Balance With An Allowance Recorded | 10,610 | 9,998 | 11,489
Impaired Balance, Total | 18,815 | 29,153 | 24,288
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,786 | 5,836 | 2,693
Related Allowance, Total | 1,786 | 5,836 | 2,693
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 10,121 | 13,480 | 13,310
Average Recorded Investment With An Allowance Recorded | 11,506 | 10,131 | 10,470
Average Recorded Investment, Total | 21,627 | 23,611 | 23,780
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | (9) | 116 | 116
Interest Income Recognized With An Allowance Recorded | 1 | 12 | 14
Interest Income Recognized, Total | (8) | 128 | 130
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 1 | 150 | 144
Interest Income Collected With An Allowance Recorded | 4 | 53 | 61
Interest Income Collected, Total | 5 | 203 | 205
Commercial [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 35,399 |  | 34,686
Unpaid Contractual Principal Balance With An Allowance Recorded | 4,789 |  | 6,430
Unpaid Contractual Principal Balance, Total | 40,188 |  | 41,116
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 30,152 | 31,854 | 29,385
Impaired Balance With An Allowance Recorded | 4,059 | 3,054 | 6,430
Impaired Balance, Total | 34,211 | 34,908 | 35,815
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 864 | 824 | 2,061
Related Allowance, Total | 864 | 824 | 2,061
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 30,141 | 26,242 | 27,027
Average Recorded Investment With An Allowance Recorded | 4,282 | 6,599 | 6,557
Average Recorded Investment, Total | 34,423 | 32,841 | 33,584
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 670 | 599 | 833
Interest Income Recognized With An Allowance Recorded | 115 | 66 | 182
Interest Income Recognized, Total | 785 | 665 | 1,015
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 667 | 615 | 834
Interest Income Collected With An Allowance Recorded | 116 | 79 | 197
Interest Income Collected, Total | 783 | 694 | 1,031
Residential [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 4,291 |  | 2,601
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,260 |  | 4,772
Unpaid Contractual Principal Balance, Total | 9,551 |  | 7,373
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 3,694 | 3,737 | 1,934
Impaired Balance With An Allowance Recorded | 4,547 | 5,345 | 4,042
Impaired Balance, Total | 8,241 | 9,082 | 5,976
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 1,050 | 523 | 675
Related Allowance, Total | 1,050 | 523 | 675
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 2,751 | 3,590 | 3,176
Average Recorded Investment With An Allowance Recorded | 4,244 | 3,798 | 3,859
Average Recorded Investment, Total | 6,995 | 7,388 | 7,035
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 84 | 30 | 88
Interest Income Recognized With An Allowance Recorded | 79 | 197 | 97
Interest Income Recognized, Total | 163 | 227 | 185
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 99 | 46 | 80
Interest Income Collected With An Allowance Recorded | 78 | 181 | 97
Interest Income Collected, Total | 177 | 227 | 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 | 487 | 227
Impaired Balance With An Allowance Recorded | 0 |  | 260
Impaired Balance, Total | 2,297 | 487 | 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 | 381 | 342
Average Recorded Investment With An Allowance Recorded | 87 |  | 65
Average Recorded Investment, Total | 2,384 | 381 | 407
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 31 | 48 | 66
Interest Income Recognized With An Allowance Recorded | 0 |  | (18)
Interest Income Recognized, Total | 31 | 48 | 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
Consumer [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 226 |  | 229
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 5
Unpaid Contractual Principal Balance, Total | 226 |  | 234
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 208 | 159 | 216
Impaired Balance With An Allowance Recorded | 0 | 11 | 5
Impaired Balance, Total | 208 | 170 | 221
Related Allowance [Abstract] |  |  |
Impaired Financing Receivable With No Related Allowance Recorded | 0 | 0 | 0
Related Allowance With An Allowance Recorded | 0 | 5 | 2
Related Allowance, Total | 0 | 5 | 2
Average Recorded Investment [Abstract] |  |  |
Average Recorded Investment With No Related Allowance Recorded | 219 | 174 | 184
Average Recorded Investment With An Allowance Recorded | 0 | 4 | 4
Average Recorded Investment, Total | 219 | 178 | 188
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 5 | 5 | 11
Interest Income Recognized With An Allowance Recorded | 0 | 1 | 1
Interest Income Recognized, Total | 5 | 6 | 12
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 6 | 6 | 12
Interest Income Collected With An Allowance Recorded | 0 | 1 | 1
Interest Income Collected, Total | 6 | 7 | 13
Other [Member] |  |  |
Unpaid Contractual Principal Balance [Abstract] |  |  |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 |  | 52
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 |  | 0
Unpaid Contractual Principal Balance, Total | 0 |  | 52
Impaired Balance [Abstract] |  |  |
Impaired Balance With No Related Allowance Recorded | 0 | 48 | 43
Impaired Balance With An Allowance Recorded | 0 | 0 | 0
Impaired Balance, Total | 0 | 48 | 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 | 27 | 38 | 40
Average Recorded Investment With An Allowance Recorded | 0 | 26 | 19
Average Recorded Investment, Total | 27 | 64 | 59
Interest Income Recognized [Abstract] |  |  |
Interest Income Recognized With No Related Allowance Recorded | 0 | 2 | 1
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0
Interest Income Recognized, Total | 0 | 2 | 1
Interest Income Collected [Abstract] |  |  |
Interest Income Collected With No Related Allowance Recorded | 0 | 2 | 2
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0
Interest Income Collected, Total | $ 0 | $ 2 | $ 2

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