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Merger accounting - Summary of Acquired Nonimpaired and Impaired Loans (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Acquired Non Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required principal and interest at acquisition	$ 501,423
Expected cash flows at acquisition	501,423
Interest component of expected cash flows (accretable discount)	(4,773)
Fair value of acquired loans	496,650
Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractually required principal and interest at acquisition	19,353
Contractual cash flows not expected to be collected (nonaccretable discount)	(10,873)
Expected cash flows at acquisition	8,480
Interest component of expected cash flows (accretable discount)	(1,128)
Fair value of acquired loans	$ 7,352

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Amount of cash flows expected to be collected at acquisition of acquired loans accounted for as debt securities with evidence of deterioration of credit quality.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 15
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=27045933&loc=d3e13503-111538

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=6379141&loc=d3e15032-111544

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