Borrowings and Subordinated Debentures (Details 1) $ in Thousands, € in Millions		9 Months Ended
		Sep. 30, 2016 USD ($)	Sep. 30, 2016 EUR (€)	Dec. 31, 2015 USD ($)
Subordinated Borrowing [Line Items]
Amount		$ 540,728		$ 539,795
Unamortized discount	[1]	(99,616)		(103,795)
Net subordinated debentures		441,112		436,000
Subordinated Debt Trust V Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		3.96%	3.96%	3.63%
Date Issued		Aug. 15, 2003
Maturity Date		Sep. 17, 2033
Description of variable rate basis		3 month LIBOR + 3.10
Subordinated Debt Trust VI Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		3.90%	3.90%	3.39%
Date Issued		Sep. 03, 2003
Maturity Date		Sep. 15, 2033
Description of variable rate basis		3 month LIBOR + 3.05
Subordinated Debt Trust CII Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 5,155		$ 5,155
Rate		3.81%	3.81%	3.35%
Date Issued		Sep. 17, 2003
Maturity Date		Sep. 17, 2033
Description of variable rate basis		3 month LIBOR + 2.95
Subordinated Debt Trust VII Due April 2034
Subordinated Borrowing [Line Items]
Amount		$ 61,856		$ 61,856
Rate		3.51%	3.51%	3.07%
Date Issued		Feb. 05, 2004
Maturity Date		Apr. 23, 2034
Description of variable rate basis		3 month LIBOR + 2.75
Subordinated Debt Trust CIII Due September 2035
Subordinated Borrowing [Line Items]
Amount		$ 20,619		$ 20,619
Rate		2.54%	2.54%	2.20%
Date Issued		Aug. 15, 2005
Maturity Date		Sep. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.69
Subordinated Debt Trust FCCI Due March 2037
Subordinated Borrowing [Line Items]
Amount		$ 16,495		$ 16,495
Rate		2.45%	2.45%	2.11%
Date Issued		Jan. 25, 2007
Maturity Date		Mar. 15, 2037
Description of variable rate basis		3 month LIBOR + 1.60
Subordinated Debt Trust FCBI Due December 2035
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		2.40%	2.40%	2.06%
Date Issued		Sep. 30, 2005
Maturity Date		Dec. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.55
Trust Preferred Securities Two Thousand Five Series One
Subordinated Borrowing [Line Items]
Amount		$ 82,475		$ 82,475
Rate		2.80%	2.80%	2.46%
Date Issued		Nov. 21, 2005
Maturity Date		Dec. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Five Series Two
Subordinated Borrowing [Line Items]
Amount		$ 128,866		$ 128,866
Rate		2.71%	2.71%	2.27%
Date Issued		Dec. 14, 2005
Maturity Date		Jan. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Six One Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 51,545		$ 51,545
Rate		2.71%	2.71%	2.27%
Date Issued		Feb. 22, 2006
Maturity Date		Apr. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Six Two Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 51,550		$ 51,550
Rate		2.71%	2.71%	2.27%
Date Issued		Sep. 27, 2006
Maturity Date		Oct. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Amount	[2]	$ 28,940		$ 28,007
Rate		1.75%	1.75%	1.98%
Date Issued		Sep. 29, 2006
Maturity Date		Oct. 30, 2036
Denomination value | €			€ 25.8
Description of variable rate basis		3 month EURIBOR + 2.05
Trust Preferred Securities Two Thousand Six Series Four
Subordinated Borrowing [Line Items]
Amount		$ 16,470		$ 16,470
Rate		2.71%	2.71%	2.27%
Date Issued		Dec. 05, 2006
Maturity Date		Jan. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Six Series Five
Subordinated Borrowing [Line Items]
Amount		$ 6,650		$ 6,650
Rate		2.71%	2.71%	2.27%
Date Issued		Dec. 19, 2006
Maturity Date		Jan. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Seven One Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 39,177		$ 39,177
Rate		2.71%	2.71%	2.27%
Date Issued		Jun. 13, 2007
Maturity Date		Jul. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust V Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.96%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust VI Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.90%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust CII Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.81%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust VII Due April 2034
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.51%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust CIII Due September 2035
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.54%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust FCCI Due March 2037
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.45%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust FCBI Due December 2035
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.40%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Five Series One
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.80%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Five Series Two
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
London Interbank Offered Rate (LIBOR) | Two Thousand Six One Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
London Interbank Offered Rate (LIBOR) | Two Thousand Six Two Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Six Series Four
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Six Series Five
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
London Interbank Offered Rate (LIBOR) | Two Thousand Seven One Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.71%
Euribor Future | Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.75%

[1] Amount represents the fair value adjustment on subordinated debentures assumed in acquisitions.

[2] Denomination is in Euros with a value of €25.8 million.