Loans Receivable and Allowance for Credit Losses (Details 7) - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 15,099	$ 475	$ 34,064	$ 34,503
Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	15,075	444	23,557	30,633
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	24	0	10,507	0
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	2,087
Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	31	0	32
Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	1,751
CRE
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	172		1,648	20,963
CRE | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	172		1,648	19,812
CRE | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0		0	0
CRE | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0		0	0
CRE | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0		0	0
CRE | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0		0	1,151
C&I
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	14,927	475	28,796	12,138
C&I | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	14,903	444	18,289	10,218
C&I | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	24	0	10,507	0
C&I | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0	0	1,288
C&I | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	31	0	32
C&I | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 0	$ 0	0	600
Residential
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			3,620	1,065
Residential | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			3,620	266
Residential | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			0	0
Residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			0	799
Residential | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			0	0
Residential | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			0	0
Consumer
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment			$ 0	337
Consumer | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment				337
Consumer | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment				0
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment				0
Consumer | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment				0
Consumer | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment				$ 0