Loans, Impaired Financing Receivable (Details) (USD $) | 3 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $35,699 | $37,232 | $38,060 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 7,366 | 16,054 | 8,908 |
Unpaid Contractual Principal Balance, Total | 43,065 | 53,286 | 46,968 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 28,083 | 32,134 | 29,491 |
Impaired Balance With An Allowance Recorded | 7,188 | 13,237 | 8,829 |
Impaired Balance, Total | 35,271 | 45,371 | 38,320 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 735 | 2,900 | 1,051 |
Related Allowance Total | 735 | 2,900 | 1,051 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 28,083 | 32,134 | 29,505 |
Average Recorded Investment With An Allowance Recorded | 7,188 | 13,237 | 10,722 |
Average Recorded Investment, Total | 35,271 | 45,371 | 40,227 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 194 | 184 | 802 |
Interest Income Recognized With An Allowance Recorded | 63 | 57 | 158 |
Interest Income Recognized, Total | 257 | 241 | 960 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 241 | 207 | 859 |
Interest Income Collected With An Allowance Recorded | 56 | 61 | 150 |
Interest Income Collected, Total | 297 | 268 | 1,009 |
Commercial [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 492 | 599 | 310 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 94 | 1,380 | 97 |
Unpaid Contractual Principal Balance, Total | 586 | 1,979 | 407 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 464 | 599 | 308 |
Impaired Balance With An Allowance Recorded | 94 | 1,380 | 97 |
Impaired Balance, Total | 558 | 1,979 | 405 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 94 | 423 | 97 |
Related Allowance Total | 94 | 423 | 97 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 464 | 599 | 679 |
Average Recorded Investment With An Allowance Recorded | 94 | 1,380 | 420 |
Average Recorded Investment, Total | 558 | 1,979 | 1,099 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | -7 | 5 | 9 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | -7 | 5 | 9 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 5 | 13 | 18 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 5 | 13 | 18 |
Agricultural [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 174 | 56 | 50 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 174 | 56 | 50 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 156 | 51 | 45 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 156 | 51 | 45 |
Related Allowance [Abstract] | | | |
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 | 156 | 51 | 51 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 156 | 51 | 51 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | -10 | -9 | -6 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | -10 | -9 | -6 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 10 | 0 | 3 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 10 | 0 | 3 |
Commercial Construction [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 9,537 | 7,460 | 9,573 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 206 | 5,922 | 207 |
Unpaid Contractual Principal Balance, Total | 9,743 | 13,382 | 9,780 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 3,428 | 4,354 | 3,464 |
Impaired Balance With An Allowance Recorded | 134 | 3,470 | 136 |
Impaired Balance, Total | 3,562 | 7,824 | 3,600 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 49 | 1,548 | 54 |
Related Allowance Total | 49 | 1,548 | 54 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 3,428 | 4,354 | 3,376 |
Average Recorded Investment With An Allowance Recorded | 134 | 3,470 | 1,529 |
Average Recorded Investment, Total | 3,562 | 7,824 | 4,905 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 6 | 8 | 13 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 6 | 8 | 13 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 7 | 8 | 13 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 7 | 8 | 13 |
Residential Construction [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 0 | |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | |
Unpaid Contractual Principal Balance, Total | 0 | 0 | |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 0 | 0 | |
Impaired Balance With An Allowance Recorded | 0 | 0 | |
Impaired Balance, Total | 0 | 0 | |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 0 | 0 | |
Related Allowance Total | 0 | 0 | |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 0 | 0 | |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | |
Average Recorded Investment, Total | 0 | 0 | |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 0 | 0 | |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | |
Interest Income Recognized, Total | 0 | 0 | |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | |
Interest Income Collected With An Allowance Recorded | 0 | 0 | |
Interest Income Collected, Total | 0 | 0 | |
Commercial Real Estate [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 17,531 | 21,196 | 17,130 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,463 | 6,466 | 6,135 |
Unpaid Contractual Principal Balance, Total | 22,994 | 27,662 | 23,265 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 17,037 | 20,686 | 16,228 |
Impaired Balance With An Allowance Recorded | 5,463 | 6,109 | 6,135 |
Impaired Balance, Total | 22,500 | 26,795 | 22,363 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 209 | 407 | 457 |
Related Allowance Total | 209 | 407 | 457 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 17,037 | 20,686 | 18,350 |
Average Recorded Investment With An Allowance Recorded | 5,463 | 6,109 | 6,415 |
Average Recorded Investment, Total | 22,500 | 26,795 | 24,765 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 157 | 130 | 462 |
Interest Income Recognized With An Allowance Recorded | 45 | 46 | 61 |
Interest Income Recognized, Total | 202 | 176 | 523 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 163 | 132 | 474 |
Interest Income Collected With An Allowance Recorded | 45 | 46 | 51 |
Interest Income Collected, Total | 208 | 178 | 525 |
Residential Real Estate [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 6,141 | 7,113 | 9,137 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,209 | 962 | 2,073 |
Unpaid Contractual Principal Balance, Total | 7,350 | 8,075 | 11,210 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 5,195 | 5,642 | 7,600 |
Impaired Balance With An Allowance Recorded | 1,103 | 954 | 2,065 |
Impaired Balance, Total | 6,298 | 6,596 | 9,665 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 330 | 289 | 414 |
Related Allowance Total | 330 | 289 | 414 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 5,195 | 5,642 | 5,691 |
Average Recorded Investment With An Allowance Recorded | 1,103 | 954 | 1,829 |
Average Recorded Investment, Total | 6,298 | 6,596 | 7,520 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 42 | 46 | 312 |
Interest Income Recognized With An Allowance Recorded | 13 | 11 | 84 |
Interest Income Recognized, Total | 55 | 57 | 396 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 47 | 46 | 306 |
Interest Income Collected With An Allowance Recorded | 6 | 15 | 87 |
Interest Income Collected, Total | 53 | 61 | 393 |
Farmland [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 1,419 | 349 | 1,451 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 394 | 1,324 | 396 |
Unpaid Contractual Principal Balance, Total | 1,813 | 1,673 | 1,847 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 1,417 | 348 | 1,449 |
Impaired Balance With An Allowance Recorded | 394 | 1,324 | 396 |
Impaired Balance, Total | 1,811 | 1,672 | 1,845 |
Related Allowance [Abstract] | | | |
Related Allowance With An Allowance Recorded | 53 | 233 | 29 |
Related Allowance Total | 53 | 233 | 29 |
Average Recorded Investment [Abstract] | | | |
Average Recorded Investment With No Related Allowance Recorded | 1,417 | 348 | 949 |
Average Recorded Investment With An Allowance Recorded | 394 | 1,324 | 529 |
Average Recorded Investment, Total | 1,811 | 1,672 | 1,478 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 3 | -2 | -8 |
Interest Income Recognized With An Allowance Recorded | 5 | 0 | 13 |
Interest Income Recognized, Total | 8 | -2 | 5 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 3 | 1 | 18 |
Interest Income Collected With An Allowance Recorded | 5 | 0 | 12 |
Interest Income Collected, Total | 8 | 1 | 30 |
Consumer [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 200 | 256 | 202 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 200 | 256 | 202 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 192 | 251 | 202 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 192 | 251 | 202 |
Related Allowance [Abstract] | | | |
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 | 192 | 251 | 212 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 192 | 251 | 212 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 1 | 4 | 14 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 1 | 4 | 14 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 4 | 5 | 16 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 4 | 5 | 16 |
Other [Member] | | | |
Unpaid Contractual Principal Balance [Abstract] | | | |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 205 | 203 | 207 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 205 | 203 | 207 |
Impaired Balance [Abstract] | | | |
Impaired Balance With No Related Allowance Recorded | 194 | 203 | 195 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 194 | 203 | 195 |
Related Allowance [Abstract] | | | |
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 | 194 | 203 | 197 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 194 | 203 | 197 |
Interest Income Recognized [Abstract] | | | |
Interest Income Recognized With No Related Allowance Recorded | 2 | 2 | 6 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 2 | 2 | 6 |
Interest Income Collected [Abstract] | | | |
Interest Income Collected With No Related Allowance Recorded | 2 | 2 | 11 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | $2 | $2 | $11 |