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Loans and Allowance for Credit Losses (Impaired Financing Receivables by Loan Class) (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance $ 17,321   $ 19,266
Recorded investment with no allowance 9,463   10,977
Recorded investment with an allowance 6,832   7,320
Related allowance 621   805
Average recorded investment 15,983 $ 19,129  
Interest income recognized 16,605 20,239  
Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 8,388   5,940
Recorded investment with no allowance 4,290   1,813
Recorded investment with an allowance 3,072   3,158
Related allowance 376   492
Average recorded investment 6,822 6,563  
Interest income recognized 6,355 7,661  
Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 8,933   13,326
Recorded investment with no allowance 5,173   9,164
Recorded investment with an allowance 3,760   4,162
Related allowance 245   313
Average recorded investment 9,161 12,566  
Interest income recognized 10,250 12,578  
Residential Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 7,063   6,156
Recorded investment with no allowance 3,902   3,524
Recorded investment with an allowance 3,029   2,494
Related allowance 194   239
Average recorded investment 6,419 6,531  
Interest income recognized 6,186 7,193  
Residential Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,399   1,620
Recorded investment with no allowance 2,267   1,482
Average recorded investment 1,710 2,840  
Interest income recognized 1,573 3,573  
Residential Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,664   4,536
Recorded investment with no allowance 1,635   2,042
Recorded investment with an allowance 3,029   2,494
Related allowance 194   239
Average recorded investment 4,709 3,691  
Interest income recognized 4,613 3,620  
Commercial Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 6,352   5,613
Recorded investment with no allowance 5,224   4,233
Recorded investment with an allowance 712   734
Related allowance 32   33
Average recorded investment 6,049 5,330  
Interest income recognized 5,937 5,499  
Commercial Real Estate Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 2,155   795
Recorded investment with no allowance 1,739   149
Average recorded investment 1,742 489  
Interest income recognized 1,438 627  
Commercial Real Estate Portfolio Segment [Member] | Impaired Accruing Restructured Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 4,197   4,818
Recorded investment with no allowance 3,485   4,084
Recorded investment with an allowance 712   734
Related allowance 32   33
Average recorded investment 4,307 4,841  
Interest income recognized 4,499 4,872  
Commercial Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 425   425
Recorded investment with an allowance 324   337
Related allowance 20   33
Average recorded investment 327 344  
Interest income recognized 338 153  
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 324   337
Related allowance 20   33
Average recorded investment 327 344  
Interest income recognized 338 153  
Consumer Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Interest income recognized   55  
Consumer Portfolio Segment [Member] | Impaired Nonaccrual Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Interest income recognized   55  
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Unpaid principal balance 3,481   7,072
Recorded investment with no allowance 337   3,220
Recorded investment with an allowance 2,767   3,755
Related allowance 375   500
Average recorded investment 3,188 6,924  
Interest income recognized 4,144 7,339  
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 3,409   3,100
Recorded investment with no allowance 284   182
Recorded investment with an allowance 2,748   2,821
Related allowance 356   459
Average recorded investment 3,043 2,890  
Interest income recognized 3,006 3,253  
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 72   3,972
Recorded investment with no allowance 53   3,038
Recorded investment with an allowance 19   934
Related allowance 19   $ 41
Average recorded investment 145 4,034  
Interest income recognized $ 1,138 $ 4,086