Loans, Impaired Financing Receivable (Details) (USD $) | 3 Months Ended | 12 Months Ended |
In Thousands, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013 |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | $37,232 | $30,255 | $36,744 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 16,054 | 23,840 | 16,526 |
Unpaid Contractual Principal Balance, Total | 53,286 | 54,095 | 53,270 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 32,134 | 25,601 | 31,289 |
Impaired Balance With An Allowance Recorded | 13,237 | 21,988 | 13,975 |
Impaired Balance, Total | 45,371 | 47,589 | 45,264 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 2,900 | 4,493 | 2,299 |
Related Allowance, Total | 2,900 | 4,493 | 2,299 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 32,134 | 25,601 | 24,209 |
Average Recorded Investment With An Allowance Recorded | 13,237 | 21,988 | 22,112 |
Average Recorded Investment, Total | 45,371 | 47,589 | 46,321 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 184 | 118 | 797 |
Interest Income Recognized With An Allowance Recorded | 57 | 133 | 243 |
Interest Income Recognized, Total | 241 | 251 | 1,040 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 207 | 161 | 802 |
Interest Income Collected With An Allowance Recorded | 61 | 145 | 240 |
Interest Income Collected, Total | 268 | 306 | 1,042 |
Commercial [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 599 | 264 | 305 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,380 | 1,465 | 1,453 |
Unpaid Contractual Principal Balance, Total | 1,979 | 1,729 | 1,758 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 599 | 122 | 305 |
Impaired Balance With An Allowance Recorded | 1,380 | 1,465 | 1,453 |
Impaired Balance, Total | 1,979 | 1,587 | 1,758 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 423 | 456 | 434 |
Related Allowance, Total | 423 | 456 | 434 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 599 | 122 | 216 |
Average Recorded Investment With An Allowance Recorded | 1,380 | 1,465 | 1,689 |
Average Recorded Investment, Total | 1,979 | 1,587 | 1,905 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 5 | 3 | 24 |
Interest Income Recognized With An Allowance Recorded | 0 | 20 | 15 |
Interest Income Recognized, Total | 5 | 23 | 39 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 13 | 4 | 25 |
Interest Income Collected With An Allowance Recorded | 0 | 17 | 21 |
Interest Income Collected, Total | 13 | 21 | 46 |
Agricultural [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 56 | 39 | 0 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 56 | 39 | 0 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 51 | 39 | 0 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 51 | 39 | 0 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance 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 | 51 | 39 | 10 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 51 | 39 | 10 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | -9 | 0 | 0 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | -9 | 0 | 0 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 0 | 0 | 0 |
Commercial Construction [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 7,460 | 9,002 | 7,856 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 5,922 | 5,339 | 5,923 |
Unpaid Contractual Principal Balance, Total | 13,382 | 14,341 | 13,779 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 4,354 | 4,962 | 4,750 |
Impaired Balance With An Allowance Recorded | 3,470 | 4,690 | 3,472 |
Impaired Balance, Total | 7,824 | 9,652 | 8,222 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 1,548 | 1,493 | 830 |
Related Allowance, Total | 1,548 | 1,493 | 830 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 4,354 | 4,962 | 4,106 |
Average Recorded Investment With An Allowance Recorded | 3,470 | 4,690 | 5,025 |
Average Recorded Investment, Total | 7,824 | 9,652 | 9,131 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 8 | 4 | 35 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 8 | 4 | 35 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 8 | 5 | 41 |
Interest Income Collected With An Allowance Recorded | 0 | 1 | 0 |
Interest Income Collected, Total | 8 | 6 | 41 |
Commercial Real Estate [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 21,196 | 15,405 | 20,121 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 6,466 | 10,077 | 5,874 |
Unpaid Contractual Principal Balance, Total | 27,662 | 25,482 | 25,995 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 20,686 | 15,331 | 19,253 |
Impaired Balance With An Allowance Recorded | 6,109 | 9,917 | 5,874 |
Impaired Balance, Total | 26,795 | 25,248 | 25,127 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 407 | 1,426 | 424 |
Related Allowance, Total | 407 | 1,426 | 424 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 20,686 | 15,331 | 13,199 |
Average Recorded Investment With An Allowance Recorded | 6,109 | 9,917 | 11,072 |
Average Recorded Investment, Total | 26,795 | 25,248 | 24,271 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 130 | 102 | 494 |
Interest Income Recognized With An Allowance Recorded | 46 | 73 | 157 |
Interest Income Recognized, Total | 176 | 175 | 651 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 132 | 129 | 504 |
Interest Income Collected With An Allowance Recorded | 46 | 91 | 148 |
Interest Income Collected, Total | 178 | 220 | 652 |
Residential Real Estate [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 7,113 | 2,726 | 7,837 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 962 | 6,959 | 1,949 |
Unpaid Contractual Principal Balance, Total | 8,075 | 9,685 | 9,786 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 5,642 | 2,382 | 6,362 |
Impaired Balance With An Allowance Recorded | 954 | 5,916 | 1,849 |
Impaired Balance, Total | 6,596 | 8,298 | 8,211 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 289 | 1,118 | 526 |
Related Allowance, Total | 289 | 1,118 | 526 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 5,642 | 2,382 | 4,564 |
Average Recorded Investment With An Allowance Recorded | 954 | 5,916 | 3,662 |
Average Recorded Investment, Total | 6,596 | 8,298 | 8,226 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 46 | 10 | 224 |
Interest Income Recognized With An Allowance Recorded | 11 | 40 | 26 |
Interest Income Recognized, Total | 57 | 50 | 250 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 46 | 18 | 209 |
Interest Income Collected With An Allowance Recorded | 15 | 36 | 24 |
Interest Income Collected, Total | 61 | 54 | 233 |
Farmland [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 349 | 2,590 | 303 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 1,324 | 0 | 1,327 |
Unpaid Contractual Principal Balance, Total | 1,673 | 2,590 | 1,630 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 348 | 2,548 | 303 |
Impaired Balance With An Allowance Recorded | 1,324 | 0 | 1,327 |
Impaired Balance, Total | 1,672 | 2,548 | 1,630 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance With No Related Allowance Recorded | 0 | 0 | 0 |
Related Allowance With An Allowance Recorded | 233 | 0 | 85 |
Related Allowance, Total | 233 | 0 | 85 |
Average Recorded Investment [Abstract] | ' | ' | ' |
Average Recorded Investment With No Related Allowance Recorded | 348 | 2,548 | 1,859 |
Average Recorded Investment With An Allowance Recorded | 1,324 | 0 | 664 |
Average Recorded Investment, Total | 1,672 | 2,548 | 2,523 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | -2 | -1 | 1 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 45 |
Interest Income Recognized, Total | -2 | -1 | 46 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 1 | 3 | 1 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 47 |
Interest Income Collected, Total | 1 | 3 | 48 |
Consumer [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 256 | 229 | 313 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 256 | 229 | 313 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 251 | 217 | 307 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 251 | 217 | 307 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance 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 | 251 | 217 | 253 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 251 | 217 | 253 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 4 | 0 | 18 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 4 | 0 | 18 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 5 | 2 | 21 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 5 | 2 | 21 |
Other [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 203 | 0 | 9 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 203 | 0 | 9 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 203 | 0 | 9 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 203 | 0 | 9 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance 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 | 203 | 0 | 2 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 203 | 0 | 2 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 2 | 0 | 1 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 2 | 0 | 1 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 2 | 0 | 1 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | 2 | 0 | 1 |
Residential Construction [Member] | ' | ' | ' |
Unpaid Contractual Principal Balance [Abstract] | ' | ' | ' |
Unpaid Contractual Principal Balance With No Related Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance With An Allowance Recorded | 0 | 0 | 0 |
Unpaid Contractual Principal Balance, Total | 0 | 0 | 0 |
Impaired Balance [Abstract] | ' | ' | ' |
Impaired Balance With No Related Allowance Recorded | 0 | 0 | 0 |
Impaired Balance With An Allowance Recorded | 0 | 0 | 0 |
Impaired Balance, Total | 0 | 0 | 0 |
Related Allowance [Abstract] | ' | ' | ' |
Related Allowance 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 | 0 | 0 | 0 |
Average Recorded Investment With An Allowance Recorded | 0 | 0 | 0 |
Average Recorded Investment, Total | 0 | 0 | 0 |
Interest Income Recognized [Abstract] | ' | ' | ' |
Interest Income Recognized With No Related Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Recognized, Total | 0 | 0 | 0 |
Interest Income Collected [Abstract] | ' | ' | ' |
Interest Income Collected With No Related Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected With An Allowance Recorded | 0 | 0 | 0 |
Interest Income Collected, Total | $0 | $0 | $0 |