ALLL Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Allowance for loan and lease losses
Balance at beginning of period				$ 130,854				$ 137,516	$ 130,854	$ 137,516	$ 137,107
Provision for loan losses	1,802	1,907	1,078	2,100	2,275	2,700	7,925	8,625	6,887	21,525	64,500
Charge-offs									(13,643)	(34,672)	(69,366)
Recoveries									6,253	6,485	5,275
Balance at end of period	130,351				130,854				130,351	130,854	137,516
Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period				15,482				17,227	15,482	17,227	20,957
Provision for loan losses									(921)	2,879	1,455
Charge-offs									(793)	(5,267)	(5,671)
Recoveries									299	643	486
Balance at end of period	14,067				15,482				14,067	15,482	17,227
Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period				74,398				76,920	74,398	76,920	76,147
Provision for loan losses									(3,670)	11,012	39,563
Charge-offs									(3,736)	(16,339)	(42,042)
Recoveries									3,340	2,805	3,252
Balance at end of period	70,332				74,398				70,332	74,398	76,920
Other Commercial
Allowance for loan and lease losses
Balance at beginning of period				21,567				20,833	21,567	20,833	19,932
Provision for loan losses									10,271	4,690	10,709
Charge-offs									(4,671)	(5,239)	(10,386)
Recoveries									1,463	1,283	578
Balance at end of period	28,630				21,567				28,630	21,567	20,833
Home Equity
Allowance for loan and lease losses
Balance at beginning of period				10,659				13,616	10,659	13,616	13,334
Provision for loan losses									868	324	4,450
Charge-offs									(2,594)	(4,369)	(4,644)
Recoveries									366	1,088	476
Balance at end of period	9,299				10,659				9,299	10,659	13,616
Other Consumer
Allowance for loan and lease losses
Balance at beginning of period				8,748				8,920	8,748	8,920	6,737
Provision for loan losses									339	2,620	8,323
Charge-offs									(1,849)	(3,458)	(6,623)
Recoveries									785	666	483
Balance at end of period	$ 8,023				$ 8,748				$ 8,023	$ 8,748	$ 8,920