Allowance for Loan and Lease Losses (Note Restructurings During Period) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013 loans	Sep. 30, 2012 loans	Sep. 30, 2013 loans	Sep. 30, 2012 loans	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	$ 209,745	$ 333,170	$ 209,745	$ 333,170	$ 333,170
Commercial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	175,627	294,351	175,627	294,351
Commercial | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	26,899	74,288	26,899	74,288
Commercial | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	132,444	189,331	132,444	189,331
Commercial | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	4,878	12,331	4,878	12,331
Commercial | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	11,258	18,177	11,258	18,177
Commercial | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	148	224	148	224
Noncommerical
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	34,118	38,819	34,118	38,819
Noncommerical | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	28,909	34,605	28,909	34,605
Noncommerical | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	939	1,657	939	1,657
Noncommerical | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	3,058	48	3,058	48
Originated Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	95,514		95,514		139,963
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	15	4	17	21
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	6,765	1,220	7,556	5,710
Financing Receivable, Modifications, Number of Contracts	23	25	138	122
Financing Receivable, Modifications, Post-Modification Recorded Investment	4,619	7,268	27,427	45,049
Originated Loans | Interest Only Loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	1,290
Financing Receivable, Modifications, Number of Contracts	1	5	13	17
Financing Receivable, Modifications, Post-Modification Recorded Investment	203	1,589	4,373	5,796
Originated Loans | Loan Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	4	6	14
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,303	1,220	2,094	3,586
Financing Receivable, Modifications, Number of Contracts	8	15	25	77
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,983	4,173	6,501	30,115
Originated Loans | Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	7	0	7	4
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	5,371	0	5,371	834
Financing Receivable, Modifications, Number of Contracts	11	5	65	25
Financing Receivable, Modifications, Post-Modification Recorded Investment	1,308	1,506	13,903	7,829
Originated Loans | Discharge of Debt
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	0	4	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	91	0	91	0
Financing Receivable, Modifications, Number of Contracts	3	0	35	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	125	0	2,650	0
Originated Loans | Commercial | Interest Only Loan | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	316
Originated Loans | Commercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	952
Financing Receivable, Modifications, Number of Contracts	0	3	9	12
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1,009	3,242	4,562
Originated Loans | Commercial | Interest Only Loan | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			1	0
Financing Receivable, Modifications, Post-Modification Recorded Investment			98	0
Originated Loans | Commercial | Interest Only Loan | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	1	2	2	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	203	580	403	580
Originated Loans | Commercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	7,606
Originated Loans | Commercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	4	5	10
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,303	1,220	1,524	3,389
Financing Receivable, Modifications, Number of Contracts	5	10	12	45
Financing Receivable, Modifications, Post-Modification Recorded Investment	2,372	3,505	4,935	16,314
Originated Loans | Commercial | Loan Term Extension | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	1,334
Originated Loans | Commercial | Loan Term Extension | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	150
Financing Receivable, Modifications, Number of Contracts	0	2	2	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	513	623	1,371
Originated Loans | Commercial | Loan Term Extension | Lease financing
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	172
Originated Loans | Commercial | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	1	0	2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	45	0	265	228
Originated Loans | Commercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	5	0	5	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	5,125	0	5,125	0
Financing Receivable, Modifications, Number of Contracts	4	3	29	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	859	1,385	10,248	5,462
Originated Loans | Commercial | Below Market Interest Rate | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			3	0
Financing Receivable, Modifications, Post-Modification Recorded Investment			738	0
Originated Loans | Commercial | Below Market Interest Rate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0	1	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	173	0	173	0
Financing Receivable, Modifications, Number of Contracts	0	1	4	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	113	829	226
Originated Loans | Commercial | Other Concession | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	924
Originated Loans | Noncommerical | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	338
Financing Receivable, Modifications, Number of Contracts			1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			630	338
Originated Loans | Noncommerical | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	570	47
Financing Receivable, Modifications, Number of Contracts	2	2	9	7
Financing Receivable, Modifications, Post-Modification Recorded Investment	590	133	879	493
Originated Loans | Noncommerical | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	1,701
Originated Loans | Noncommerical | Loan Term Extension | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	1	1	2	6
Financing Receivable, Modifications, Post-Modification Recorded Investment	21	22	64	1,124
Originated Loans | Noncommerical | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	3
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	785
Financing Receivable, Modifications, Number of Contracts	1	1	14	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	319	8	826	1,853
Originated Loans | Noncommerical | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	2	0	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	42	0	555	0
Originated Loans | Noncommerical | Below Market Interest Rate | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	0	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	73	0	73	49
Financing Receivable, Modifications, Number of Contracts	3	0	6	1
Financing Receivable, Modifications, Post-Modification Recorded Investment	43	0	215	49
Originated Loans | Noncommerical | Below Market Interest Rate | Consumer
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			3	2
Financing Receivable, Modifications, Post-Modification Recorded Investment			227	11
Originated Loans | Noncommerical | Discharge of Debt | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	44	0	44	0
Financing Receivable, Modifications, Number of Contracts	0	0	4	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	0	130	0
Originated Loans | Noncommerical | Discharge of Debt | Revolving mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	2	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	47	0	47	0
Financing Receivable, Modifications, Number of Contracts	3	0	31	0
Financing Receivable, Modifications, Post-Modification Recorded Investment	125	0	2,520	0
Originated Loans | Noncommerical | Other Concession
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	3
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	1,309
Originated Loans | Noncommerical | Other Concession | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	385
Acquired Loans
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Recorded Investment	114,231		114,231		193,207
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	10	8	14	21
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	6,025	6,127	8,718	11,483
Financing Receivable, Modifications, Number of Contracts	3	26	42	74
Financing Receivable, Modifications, Post-Modification Recorded Investment	569	13,886	26,104	44,565
Acquired Loans | Interest Only Loan
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	2	3	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,628	495	4,618	495
Financing Receivable, Modifications, Number of Contracts	0	4	6	8
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	4,158	3,892	13,049
Acquired Loans | Loan Term Extension
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	1	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	198	4,606	198	7,240
Financing Receivable, Modifications, Number of Contracts	2	4	9	17
Financing Receivable, Modifications, Post-Modification Recorded Investment	278	5,196	3,914	12,134
Acquired Loans | Below Market Interest Rate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	8	5	10	17
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	3,199	1,026	3,902	3,748
Financing Receivable, Modifications, Number of Contracts	1	18	27	49
Financing Receivable, Modifications, Post-Modification Recorded Investment	291	4,532	18,298	19,382
Acquired Loans | Commercial | Interest Only Loan | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	1	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	2,628	336	2,628	336
Financing Receivable, Modifications, Number of Contracts	0	1	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	336	2,628	474
Acquired Loans | Commercial | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1	2	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	159	1,990	159
Financing Receivable, Modifications, Number of Contracts	0	3	2	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	3,822	1,060	12,317
Acquired Loans | Commercial | Interest Only Loan | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			1	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			23	158
Acquired Loans | Commercial | Loan Term Extension | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	2,634
Financing Receivable, Modifications, Number of Contracts			5	9
Financing Receivable, Modifications, Post-Modification Recorded Investment			2,517	5,449
Acquired Loans | Commercial | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	1	0	1	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	157	0	157	1,413
Acquired Loans | Commercial | Loan Term Extension | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	1	1	2	2
Financing Receivable, Modifications, Post-Modification Recorded Investment	121	118	1,042	147
Acquired Loans | Commercial | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	0	2	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,067	0	1,067	929
Financing Receivable, Modifications, Number of Contracts	0	2	5	10
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	52	3,489	1,464
Acquired Loans | Commercial | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	2	1	2	5
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	1,290	1,015	1,290	2,747
Financing Receivable, Modifications, Number of Contracts	1	5	9	14
Financing Receivable, Modifications, Post-Modification Recorded Investment	291	3,173	11,428	13,493
Acquired Loans | Commercial | Below Market Interest Rate | Other commercial real estate
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	2
Financing Receivable, Modifications, Post-Modification Recorded Investment			0	1,766
Acquired Loans | Commercial | Below Market Interest Rate | Commercial and industrial
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0	0	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	0	0	0	0
Financing Receivable, Modifications, Number of Contracts	0	1	3	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	1,137	510	1,137
Acquired Loans | Noncommerical | Interest Only Loan | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			2	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			181	100
Acquired Loans | Noncommerical | Loan Term Extension | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	1	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	198	4,606	198	4,606
Financing Receivable, Modifications, Number of Contracts	0	3	1	4
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	5,078	198	5,125
Acquired Loans | Noncommerical | Below Market Interest Rate | Mortgage
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	4	4	6	7
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	842	11	1,545	72
Financing Receivable, Modifications, Number of Contracts	0	10	10	18
Financing Receivable, Modifications, Post-Modification Recorded Investment	0	170	2,871	1,522
Acquired Loans | Noncommerical | Below Market Interest Rate | Construction and land development
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Subsequent Default, Number of Contracts			0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0	0
Financing Receivable, Modifications, Number of Contracts			0	1
Financing Receivable, Modifications, Post-Modification Recorded Investment			$ 0	$ 0