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Loans and allowance for credit losses (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Impaired Nonaccrual Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | $ 26,702 | $ 21,554
Recorded investment with no allowance | 11,037 | 12,422
Recorded investment with an allowance | 8,119 | 2,204
Related allowance | 2,049 | 716
Year-to-date average recorded investment | 20,224 | 26,006
Impaired Nonaccrual Loans [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 12,805 | 6,787
Recorded investment with no allowance | 4,383 | 3,709
Recorded investment with an allowance | 3,828 | 240
Related allowance | 340 | 203
Year-to-date average recorded investment | 7,969 | 7,270
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 5,064 | 7,692
Recorded investment with no allowance | 3,363 | 3,862
Recorded investment with an allowance | 382 | 1,304
Related allowance | 115 | 225
Year-to-date average recorded investment | 6,393 | 10,240
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 6,792 | 5,218
Recorded investment with no allowance | 2,566 | 4,261
Recorded investment with an allowance | 3,811 | 410
Related allowance | 1,504 | 38
Year-to-date average recorded investment | 5,162 | 7,829
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 1,991 | 1,801
Recorded investment with no allowance | 710 | 547
Recorded investment with an allowance | 71 | 245
Related allowance | 63 | 245
Year-to-date average recorded investment | 686 | 619
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 50 | 56
Recorded investment with no allowance | 15 | 43
Recorded investment with an allowance | 27 | 5
Related allowance | 27 | 5
Year-to-date average recorded investment | 14 | 48
Impaired Accruing TDRs [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 25,333 | 26,088
Recorded investment with no allowance | 21,918 | 23,805
Recorded investment with an allowance | 3,415 | 2,283
Related allowance | 159 | 67
Year-to-date average recorded investment | 25,711 | 38,919
Impaired Accruing TDRs [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 1,306 | 1,620
Recorded investment with no allowance | 1,214 | 1,527
Recorded investment with an allowance | 92 | 93
Related allowance | 1 | 1
Year-to-date average recorded investment | 1,463 | 14,405
Impaired Accruing TDRs [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 16,046 | 14,582
Recorded investment with no allowance | 13,555 | 13,177
Recorded investment with an allowance | 2,491 | 1,405
Related allowance | 143 | 60
Year-to-date average recorded investment | 15,314 | 11,101
Impaired Accruing TDRs [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 7,919 | 9,791
Recorded investment with no allowance | 7,140 | 9,006
Recorded investment with an allowance | 779 | 785
Related allowance | 6 | 6
Year-to-date average recorded investment | 8,855 | 13,308
Impaired Accruing TDRs [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 62 | 95
Recorded investment with no allowance | 9 | 95
Recorded investment with an allowance | 53 | 0
Related allowance | 9 | 0
Year-to-date average recorded investment | 79 | 105
Impaired Accruing TDRs [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 0 | 0
Recorded investment with no allowance | 0 | 0
Recorded investment with an allowance | 0 | 0
Related allowance | 0 | 0
Year-to-date average recorded investment | 0 | 0
Total Impired Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 52,035 | 47,642
Recorded investment with no allowance | 32,955 | 36,227
Recorded investment with an allowance | 11,534 | 4,487
Related allowance | 2,208 | 783
Year-to-date average recorded investment | 45,935 | 64,925
Total Impired Loans [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 14,111 | 8,407
Recorded investment with no allowance | 5,597 | 5,236
Recorded investment with an allowance | 3,920 | 333
Related allowance | 341 | 204
Year-to-date average recorded investment | 9,432 | 21,675
Total Impired Loans [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 21,110 | 22,274
Recorded investment with no allowance | 16,918 | 17,039
Recorded investment with an allowance | 2,873 | 2,709
Related allowance | 258 | 285
Year-to-date average recorded investment | 21,707 | 21,341
Total Impired Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 14,711 | 15,009
Recorded investment with no allowance | 9,706 | 13,267
Recorded investment with an allowance | 4,590 | 1,195
Related allowance | 1,510 | 44
Year-to-date average recorded investment | 14,017 | 21,137
Total Impired Loans [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 2,053 | 1,896
Recorded investment with no allowance | 719 | 642
Recorded investment with an allowance | 124 | 245
Related allowance | 72 | 245
Year-to-date average recorded investment | 765 | 724
Total Impired Loans [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Unpaid principal balance | 50 | 56
Recorded investment with no allowance | 15 | 43
Recorded investment with an allowance | 27 | 5
Related allowance | 27 | 5
Year-to-date average recorded investment | $ 14 | $ 48

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