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Purchased Loans - Narrative (Details) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) loan | Mar. 31, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Allowance for loan losses attributable to restructured loans | $ 46,401,000 |  | $ 46,211,000
Purchased loans |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Financing Receivable, Modifications, Subsequent Default, Recorded Investment |  | $ 210,000 |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Number of restructured loans | loan | 0 | 2 |
Remaining availability under commitments to lend additional funds on restructured loans | $ 2,000 | $ 1,245,000 |
Purchased loans | Nonaccruing Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans |  | 52,000 |
Purchased loans | Restructured Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 616,000 | 1,201,000 |
Allowance for loan losses attributable to restructured loans | $ 100,000 | $ 31,000 |
Non purchased loans and leases |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Number of restructured loans | loan | 4 | 1 |
Restructured loans discontinued past due period | 90 days | 90 days |
Remaining availability under commitments to lend additional funds on restructured loans | $ 20,000 | $ 142,000 |
Non purchased loans and leases | Nonaccruing Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 571,000 | 57,000 |
Non purchased loans and leases | Restructured Loans |  |  |
Loans and Allowance for Loan Losses (Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 2,570,000 | 6,086,000 |
Allowance for loan losses attributable to restructured loans | $ 92,000 | $ 241,000 |

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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 4: http://www.xbrl.org/2003/role/presentationRef -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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -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=82894903&loc=d3e15032-111544 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes loans held for sale. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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