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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance $ 17,476   $ 19,266
Recorded investment with no allowance 7,012   10,977
Recorded investment with an allowance 9,365   7,320
Related allowance 711   805
Average recorded investment 16,428 $ 20,192  
Interest income recognized 16,916 20,794  
Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 7,856   5,940
Recorded investment with no allowance 3,643   1,813
Recorded investment with an allowance 3,114   3,158
Related allowance 421   492
Average recorded investment 6,757 7,874  
Interest income recognized 6,121 8,210  
Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 9,620   13,326
Recorded investment with no allowance 3,369   9,164
Recorded investment with an allowance 6,251   4,162
Related allowance 290   313
Average recorded investment 9,671 12,318  
Interest income recognized 10,795 12,584  
Residential Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 5,941   6,156
Recorded investment with no allowance 3,299   3,524
Recorded investment with an allowance 2,393   2,494
Related allowance 201   239
Average recorded investment 6,429 7,279  
Interest income recognized 6,069 7,525  
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 1,838   1,620
Recorded investment with no allowance 1,589   1,482
Average recorded investment 1,590 3,870  
Interest income recognized 1,504 3,940  
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,103   4,536
Recorded investment with no allowance 1,710   2,042
Recorded investment with an allowance 2,393   2,494
Related allowance 201   239
Average recorded investment 4,839 3,409  
Interest income recognized 4,565 3,585  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 7,030   5,613
Recorded investment with no allowance 3,457   4,233
Recorded investment with an allowance 2,926   734
Related allowance 38   33
Average recorded investment 6,394 5,539  
Interest income recognized 5,882 5,584  
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,500   795
Recorded investment with no allowance 1,853   149
Average recorded investment 1,853 670  
Interest income recognized 1,286 696  
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,530   4,818
Recorded investment with no allowance 1,604   4,084
Recorded investment with an allowance 2,926   734
Related allowance 38   33
Average recorded investment 4,541 4,869  
Interest income recognized 4,596 4,888  
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 425   425
Recorded investment with an allowance 333   337
Related allowance 29   33
Average recorded investment 332 115  
Interest income recognized 344 57  
Commercial Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 425   425
Recorded investment with an allowance 333   337
Related allowance 29   33
Average recorded investment 332 115  
Interest income recognized 344 57  
Consumer Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Average recorded investment   66  
Interest income recognized   82  
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Average recorded investment   66  
Interest income recognized   82  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,080   7,072
Recorded investment with no allowance 256   3,220
Recorded investment with an allowance 3,713   3,755
Related allowance 443   500
Average recorded investment 3,273 7,193  
Interest income recognized 4,621 7,546  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 3,093   3,100
Recorded investment with no allowance 201   182
Recorded investment with an allowance 2,781   2,821
Related allowance 392   459
Average recorded investment 2,982 3,153  
Interest income recognized 2,987 3,435  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 987   3,972
Recorded investment with no allowance 55   3,038
Recorded investment with an allowance 932   934
Related allowance 51   $ 41
Average recorded investment 291 4,040  
Interest income recognized $ 1,634 $ 4,111