ALLL Activity (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance for loan and lease losses
Balance at beginning of period	$ 130,883	$ 137,459	$ 130,854	$ 137,516
Provision for loan losses	1,907	2,700	5,085	19,250
Charge-offs	(3,077)	(5,052)	(8,962)	(24,789)
Recoveries	1,052	1,553	3,788	4,683
Balance at end of period	130,765	136,660	130,765	136,660
Residential Real Estate
Allowance for loan and lease losses
Balance at beginning of period	14,797	18,139	15,482	17,227
Provision for loan losses	950	209	464	2,294
Charge-offs	(42)	(1,172)	(391)	(2,492)
Recoveries	45	73	195	220
Balance at end of period	15,750	17,249	15,750	17,249
Commercial Real Estate
Allowance for loan and lease losses
Balance at beginning of period	73,885	79,098	74,398	76,920
Provision for loan losses	381	(1,210)	(51)	11,800
Charge-offs	(1,235)	(586)	(2,538)	(13,120)
Recoveries	367	453	1,589	2,155
Balance at end of period	73,398	77,755	73,398	77,755
Other Commercial
Allowance for loan and lease losses
Balance at beginning of period	24,116	20,570	21,567	20,833
Provision for loan losses	385	2,859	3,964	4,163
Charge-offs	(1,065)	(1,441)	(2,817)	(3,797)
Recoveries	385	241	1,107	1,030
Balance at end of period	23,821	22,229	23,821	22,229
Home Equity
Allowance for loan and lease losses
Balance at beginning of period	9,626	10,904	10,659	13,616
Provision for loan losses	125	(555)	566	(1,025)
Charge-offs	(333)	(1,044)	(1,962)	(3,402)
Recoveries	73	679	228	795
Balance at end of period	9,491	9,984	9,491	9,984
Other Consumer
Allowance for loan and lease losses
Balance at beginning of period	8,459	8,748	8,748	8,920
Provision for loan losses	66	1,397	142	2,018
Charge-offs	(402)	(809)	(1,254)	(1,978)
Recoveries	182	107	669	483
Balance at end of period	$ 8,305	$ 9,443	$ 8,305	$ 9,443