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Loans and Allowance for Loan Losses - Allowance for credit losses (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) contract borrower loan | Dec. 31, 2017 USD ($) contract loan
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of interest that would have been accrued from non performing financial receivable, totaled | $ 200,000 | $ 200,000
Amount of recorded investment in new troubled debt restructurings, totaled | $ 248,000 | $ 263,000
Number of new loans modified as TDRs | loan | 0 | 0
Number of TDRs accounts | contract | 2 | 2
Non-performing TDRs |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of recorded investment in new troubled debt restructurings, totaled | $ 43,521,000 | $ 46,162,000
Number of TDRs accounts | contract | 1 | 1
Performing |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of recorded investment in new troubled debt restructurings, totaled | $ 204,500,000 | $ 216,500,000
Number of TDRs accounts | contract | 1 | 1
Consumer |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amount of consumer and indirect loans, outstanding | $ 89,340 |
Amount of consumer and indirect loans, specific reserves | $ 21,789 |
Number of loan consumer and indirect loans | contract | 2 |
Amount of recorded investment in new troubled debt restructurings, totaled | $ 44,000 | $ 46,000
Number of TDRs accounts | contract | 1 | 1
Number of borrowers | borrower | 2 |

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- Definition Number of new financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
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- Definition Loans And Leases Receivable Consumer And Indirect Loans + References No definition available. + Details
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- Definition Represents loans and leases receivable consumer and indirect loans + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition The gross interest income that would have been recorded in the period on troubled debt restructurings, if the loans had been current in accordance with their original terms and had been outstanding throughout the period or since origination, if held for part of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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