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Allowance for Loan and Lease Losses - Investment in Loans and Leases (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | $ 4,837,735,000 | $ 4,672,909,000 |
Interest income on impaired loans and leases | 0 | 0 | $ 0
Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 14,167,000 | 12,350,000 |
Collectively evaluated for impairment | 4,558,370,000 | 4,349,982,000 |
Total Loans | 4,572,537,000 | 4,362,332,000 |
Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 3,438,000 | 3,471,000 |
Loans acquired with deteriorated credit quality | 11,036,000 | 11,962,000 |
Collectively evaluated for impairment | 250,724,000 | 295,144,000 |
Total Loans | 265,198,000 | 310,577,000 |
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | 1,077,635,000 | 1,091,651,000 |
Commercial and industrial | Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 1,864,000 | 1,759,000 |
Collectively evaluated for impairment | 1,032,059,000 | 1,038,916,000 |
Total Loans | 1,033,923,000 | 1,040,675,000 |
Commercial and industrial | Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 32,000 | 276,000 |
Loans acquired with deteriorated credit quality | 153,000 | 506,000 |
Collectively evaluated for impairment | 43,527,000 | 50,194,000 |
Total Loans | 43,712,000 | 50,976,000 |
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | 2,340,661,000 | 2,200,727,000 |
Commercial real estate | Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 8,388,000 | 6,626,000 |
Collectively evaluated for impairment | 2,153,181,000 | 1,986,354,000 |
Total Loans | 2,161,569,000 | 1,992,980,000 |
Commercial real estate | Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 842,000 | 1,372,000 |
Loans acquired with deteriorated credit quality | 5,852,000 | 7,481,000 |
Collectively evaluated for impairment | 172,398,000 | 198,894,000 |
Total Loans | 179,092,000 | 207,747,000 |
Residential real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | 1,333,894,000 | 1,302,941,000 |
Residential real estate | Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 3,915,000 | 3,965,000 |
Collectively evaluated for impairment | 1,288,346,000 | 1,247,887,000 |
Total Loans | 1,292,261,000 | 1,251,852,000 |
Residential real estate | Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 2,564,000 | 1,823,000 |
Loans acquired with deteriorated credit quality | 5,031,000 | 3,975,000 |
Collectively evaluated for impairment | 34,038,000 | 45,291,000 |
Total Loans | 41,633,000 | 51,089,000 |
Consumer and other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | 70,989,000 | 63,123,000 |
Consumer and other | Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 70,228,000 | 62,358,000 |
Total Loans | 70,228,000 | 62,358,000 |
Consumer and other | Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 0 | 0 |
Loans acquired with deteriorated credit quality | 0 | 0 |
Collectively evaluated for impairment | 761,000 | 765,000 |
Total Loans | 761,000 | 765,000 |
Finance Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total Loans | 14,556,000 | 14,467,000 |
Finance Leases | Originated Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 0 | 0 |
Collectively evaluated for impairment | 14,556,000 | 14,467,000 |
Total Loans | 14,556,000 | 14,467,000 |
Finance Leases | Acquired Loans and Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individually evaluated for impairment | 0 | 0 |
Loans acquired with deteriorated credit quality | 0 | 0 |
Collectively evaluated for impairment | 0 | 0 |
Total Loans | $ 0 | $ 0 |

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + 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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