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Loans, Allowance for Credit Losses - Loans, and Credit Quality - Summary of loans by past due status (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Past Due [Line Items]    
Current $ 2,586,525 $ 2,552,360
Total $ 2,607,424 $ 2,573,751
Percent of current loans 99.20% 99.20%
Percent of total loans 100.00% 100.00%
30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans $ 6,130 $ 7,269
Percent past due 0.20% 0.30%
90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans $ 14,769 $ 14,122
Percent past due 0.60% 0.50%
Retail & other    
Financing Receivable, Past Due [Line Items]    
Current $ 29,402 $ 30,100
Total 29,482 30,211
Retail & other | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 80 110
Retail & other | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 0 1
Commercial portfolio segment | Commercial & industrial    
Financing Receivable, Past Due [Line Items]    
Current 824,147 798,211
Total 831,257 806,189
Commercial portfolio segment | Commercial & industrial | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 1,060 1,729
Commercial portfolio segment | Commercial & industrial | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 6,050 6,249
Commercial portfolio segment | Owner-occupied CRE    
Financing Receivable, Past Due [Line Items]    
Current 493,907 492,949
Total 499,705 496,372
Commercial portfolio segment | Owner-occupied CRE | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 1,961 112
Commercial portfolio segment | Owner-occupied CRE | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 3,837 3,311
Commercial portfolio segment | Agricultural    
Financing Receivable, Past Due [Line Items]    
Current 94,189 93,552
Total 95,991 95,450
Commercial portfolio segment | Agricultural | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 1 0
Commercial portfolio segment | Agricultural | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 1,801 1,898
Commercial real estate portfolio segment | CRE investment    
Financing Receivable, Past Due [Line Items]    
Current 447,245 442,145
Total 448,758 443,218
Commercial real estate portfolio segment | CRE investment | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 484 0
Commercial real estate portfolio segment | CRE investment | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 1,029 1,073
Commercial real estate portfolio segment | Construction & land development    
Financing Receivable, Past Due [Line Items]    
Current 95,312 90,887
Total 96,055 92,970
Commercial real estate portfolio segment | Construction & land development | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 210 2,063
Commercial real estate portfolio segment | Construction & land development | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 533 20
Residential | Residential first mortgage    
Financing Receivable, Past Due [Line Items]    
Current 429,188 428,341
Total 432,126 432,167
Residential | Residential first mortgage | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 1,985 2,736
Residential | Residential first mortgage | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 953 1,090
Residential | Residential junior mortgage    
Financing Receivable, Past Due [Line Items]    
Current 120,290 122,074
Total 121,105 122,771
Residential | Residential junior mortgage | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 249 217
Residential | Residential junior mortgage | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans 566 480
Residential | Residential construction    
Financing Receivable, Past Due [Line Items]    
Current 52,845 54,101
Total 52,945 54,403
Residential | Residential construction | 30-89 Days Past Due (accruing)    
Financing Receivable, Past Due [Line Items]    
Past due loans 100 302
Residential | Residential construction | 90 Days & Over or nonaccrual    
Financing Receivable, Past Due [Line Items]    
Past due loans $ 0 $ 0