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Non Purchased Loans - Narrative (Details) | 6 Months Ended |
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Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |
Allowance for loan losses attributable to restructured loans | $ 47,355,000 |  | $ 46,211,000
Non purchased loans and leases |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |
Mortgage and commercial loans discontinued past due period | 90 days |  |
Consumer and other retail loans charged-off past due period | 120 days |  |
Threshold for impairment measurement | $ 500,000 |  |
Troubled debt restructured | $ 4,685,000 | $ 156,000 | $ 5,588,000
Nonperforming loans charged-off past due period | 90 days |  |
Number of restructured loans | loan | 2 | 1 |
Restructured loans discontinued past due period | 90 days | 90 days |
Remaining availability under commitments to lend additional funds on restructured loans | $ 22,000 | $ 0 |
Non purchased loans and leases | Nonaccruing Loans |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 468,000 | 71,000 |
Non purchased loans and leases | Restructured Loans |  |  |
Loans and Allowance for Loan Losses (Additional Textual) [Abstract] |  |  |
Outstanding balance of restructured loans | 2,417,000 | 4,409,000 |
Allowance for loan losses attributable to restructured loans | $ 37,000 | $ 238,000 |

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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://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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