Federal Home Loan Bank Advances, Other Borrowings and Subordinated Notes (Narrative) (Details) CAD in Millions	1 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2015 CAD	Dec. 31, 2014 CAD	Sep. 30, 2016 USD ($) Rate	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CAD	Sep. 30, 2015 USD ($)	Jun. 15, 2015 USD ($)
Debt Instrument [Line Items]
Notes payable			$ 56,191,000	$ 67,429,000		$ 71,250,000
Loan agreement with unaffiliated banks			150,000,000
Short-term borrowings			33,173,000	63,887,000		57,590,000
Securities sold under agreements to repurchase			33,173,000
Other			18,360,000	18,965,000		18,332,000
Secured borrowings			133,642,000	115,504,000		112,633,000
Subordinated notes			$ 138,943,000	138,861,000		138,834,000
Loans Payable
Debt Instrument [Line Items]
Debt instrument, Issuance date			Dec. 15, 2014
Term Facility
Debt Instrument [Line Items]
Notes payable			$ 56,200,000	67,400,000		71,300,000	$ 75,000,000
Maturity date			Jun. 15, 2020
Debt instrument, Date of first required payment			Sep. 30, 2015
Debt instrument, Frequency of periodic payment			quarterly
Revolving Credit Facility
Debt Instrument [Line Items]
Notes payable			$ 0	$ 0		0
Maximum borrowing capacity			$ 75,000,000
Maturity date			Dec. 12, 2016	Dec. 14, 2015
Debt instrument, Frequency of periodic payment			quarterly
Line of credit facility, Unused capacity, Commitment fee percentage | Rate			0.20%
Securities Sold under Agreements to Repurchase
Debt Instrument [Line Items]
Securities sold under agreements to repurchase			$ 33,200,000	$ 58,900,000		57,600,000
Pledged financial instruments, Not separately reported, Securities for repurchase agreements			$ 44,100,000
Fixed Rate Promissory Note
Debt Instrument [Line Items]
Debt instrument, Issuance date			Aug. 31, 2012
Maturity date			Sep. 01, 2017
Debt instrument, Frequency of periodic payment			monthly
Other			$ 17,800,000	18,200,000		$ 18,300,000
Contractual rate			3.75%
Non Recourse Debt
Debt Instrument [Line Items]
Other			$ 519,000	$ 732,000
Subordinated Debt
Debt Instrument [Line Items]
Maturity date			Jun. 13, 2024
Contractual rate			5.00%
Base Rate Loan | Base Rate | Term Facility
Debt Instrument [Line Items]
Basis spread on variable rate			0.75%
Base Rate Loan | Base Rate | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Base Rate Loan | Eurodollar Rate
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Base Rate Loan | Federal Funds Rate
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR) | Term Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.75%
Eurodollar Rate Loan | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate			1.50%
Receivables Purchase Agreement [Member] | Secured Debt
Debt Instrument [Line Items]
Maturity date	Dec. 15, 2017	Dec. 15, 2015
Contractual rate			1.6121%
Secured borrowings		CAD 150	$ 121,900,000		CAD 160
Additional amount paid by third party | CAD	CAD 10