Loan Sales and Servicing - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 74,741	$ 161,849
Commercial, Financial and Agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		57,000
Residential Real Estate \| Residential real estate – mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 105,000

Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant