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Loans and Allowance - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Receivables [Abstract] |  |  |  |  |  |  |  |
Loans held for sale | $ 7,910,000 |  | $ 7,910,000 |  |  | $ 4,778,000 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 8,299,260,000 |  | 8,299,260,000 |  |  | 7,224,467,000 |  |
Loans - allowance for loan losses | 80,571,000 | $ 78,406,000 | 80,571,000 | $ 78,406,000 | $ 81,274,000 | 80,552,000 | $ 77,543,000 | $ 75,032,000
Residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 1,756,738,000 |  | 1,756,738,000 |  |  | 1,494,578,000 |  |
Loans - allowance for loan losses | $ 14,498,000 | $ 14,460,000 | $ 14,498,000 | $ 14,460,000 | $ 14,471,000 | 14,322,000 | $ 14,424,000 | $ 13,537,000
Percentage of troubled debt restructured loans | 100.00% | 100.00% | 100.00% | 99.00% |  |  |  |
Mortgage loans with formal foreclosure proceedings | $ 683,000 |  | $ 683,000 |  |  | 800,000 |  |
Loans acquired with deteriorated credit quality |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 16,744,000 |  | 16,744,000 |  |  | 15,784,000 |  |
Loans acquired with deteriorated credit quality | Commercial and consumer loan |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | 1,798,000 |  | 1,798,000 |  |  | 1,541,000 |  |
Loans - allowance for loan losses | 453,000 |  | 453,000 |  |  | 0 |  |
Loans acquired with deteriorated credit quality | Residential |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans | $ 1,706,000 |  | $ 1,706,000 |  |  | $ 1,293,000 |  |

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- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 + Details
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