Allowance for Loan Losses (Troubled Debt Restructuring on Financing Receivables) (Details) $ in Thousands	Jun. 30, 2016 USD ($) loans	Dec. 31, 2015 USD ($) loans	Jun. 30, 2015 USD ($) loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	2,476	2,402	2,568
Recorded Investment	$ 170,086	$ 160,928	$ 138,986
Unpaid Principal Balance	$ 177,992	$ 165,694	$ 182,187
Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	2,123	2,054	2,189
Recorded Investment	$ 130,865	$ 116,364	$ 104,648
Unpaid Principal Balance	$ 139,446	$ 122,044	$ 120,599
Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	278	262	260
Recorded Investment	$ 17,002	$ 19,518	$ 11,362
Unpaid Principal Balance	$ 17,913	$ 20,026	11,891
Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	75	86
Recorded Investment	$ 22,219	$ 25,046	$ 10,747
Unpaid Principal Balance	$ 20,633	$ 23,624
Covered TDR Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans			119
Recorded Investment			$ 22,976
Unpaid Principal Balance			$ 49,697
Commercial and Industrial
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	27	27	66
Recorded Investment	$ 36,650	$ 40,698	$ 29,454
Unpaid Principal Balance	$ 39,985	$ 41,351	$ 37,892
Commercial and Industrial | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	27	26	56
Recorded Investment	$ 36,650	$ 33,087	$ 29,454
Unpaid Principal Balance	$ 39,985	$ 33,740	$ 36,538
Commercial and Industrial | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	0	1	2
Recorded Investment	$ 0	$ 7,611	$ 0
Unpaid Principal Balance	$ 0	$ 7,611	$ 55
Commercial and Industrial | Covered Loans Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	0	0	8
Recorded Investment	$ 0	$ 0	$ 0
Unpaid Principal Balance	$ 0	$ 0	$ 1,299
Commercial Real Estate
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	35	30	96
Recorded Investment	$ 38,127	$ 29,645	$ 22,996
Unpaid Principal Balance	$ 38,895	$ 30,171	$ 44,632
Commercial Real Estate | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	26	24	69
Recorded Investment	$ 20,005	$ 14,671	$ 10,362
Unpaid Principal Balance	$ 22,025	$ 16,648	$ 15,681
Commercial Real Estate | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	6	3	3
Recorded Investment	$ 4,998	$ 918	$ 930
Unpaid Principal Balance	$ 5,453	$ 1,044	$ 1,018
Commercial Real Estate | Covered Loans Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	3	3	24
Recorded Investment	$ 13,124	$ 14,056	$ 11,704
Unpaid Principal Balance	$ 11,417	$ 12,479	$ 27,933
Commercial | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans			5
Recorded Investment			$ 930
Unpaid Principal Balance			$ 1,073
Construction Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	1	1	40
Recorded Investment	$ 566	$ 593	$ 525
Unpaid Principal Balance	$ 672	$ 682	$ 9,542
Construction Loans | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	0	0	31
Recorded Investment	$ 0	$ 0	$ 0
Unpaid Principal Balance	$ 0	$ 0	$ 0
Construction Loans | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	0
Recorded Investment	$ 0
Unpaid Principal Balance	$ 0
Construction Loans | Covered Loans Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	1	1	9
Recorded Investment	$ 566	$ 593	$ 525
Unpaid Principal Balance	$ 672	$ 682	$ 9,542
Commercial Loan
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	63	58	202
Recorded Investment	$ 75,343	$ 70,936	$ 52,975
Unpaid Principal Balance	$ 79,552	$ 72,204	$ 92,066
Commercial Loan | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	53	50	156
Recorded Investment	$ 56,655	$ 47,758	$ 39,816
Unpaid Principal Balance	$ 62,010	$ 50,388	52,219
Commercial Loan | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	6	4
Recorded Investment	$ 4,998	$ 8,529	$ 930
Unpaid Principal Balance	$ 5,453	$ 8,655
Commercial Loan | Covered Loans Commercial
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	4	4	41
Recorded Investment	$ 13,690	$ 14,649	$ 12,229
Unpaid Principal Balance	$ 12,089	$ 13,161	38,774
Commercial Loan | Covered TDR Loans
Financing Receivable, Modifications [Line Items]
Recorded Investment			$ 12,229
Consumer Loan
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	2,413	2,344	2,366
Recorded Investment	$ 94,743	$ 89,992	$ 86,011
Unpaid Principal Balance	$ 98,440	$ 93,490	$ 90,121
Consumer Loan | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	2,070	2,004	2,033
Recorded Investment	$ 74,210	$ 68,606	$ 64,832
Unpaid Principal Balance	$ 77,436	$ 71,656	$ 68,380
Consumer Loan | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	272	258	255
Recorded Investment	$ 12,004	$ 10,989	$ 10,432
Unpaid Principal Balance	$ 12,460	$ 11,371	$ 10,818
Consumer Loan | Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	71	82	78
Recorded Investment	$ 8,529	$ 10,397	$ 10,747
Unpaid Principal Balance	$ 8,544	$ 10,463	$ 10,923
Residential Mortgages
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	335	344	348
Recorded Investment	$ 26,284	$ 26,241	$ 27,031
Unpaid Principal Balance	$ 29,115	$ 28,923	$ 30,009
Residential Mortgages | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	303	312	316
Recorded Investment	$ 23,385	$ 23,905	$ 24,697
Unpaid Principal Balance	$ 25,899	$ 26,359	$ 27,439
Residential Mortgages | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	32	31	31
Recorded Investment	$ 2,899	$ 2,154	$ 2,150
Unpaid Principal Balance	$ 3,216	$ 2,382	2,386
Residential Mortgages | Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	0	1
Recorded Investment	$ 0	$ 182	$ 184
Unpaid Principal Balance	$ 0	$ 182
Credit Card Receivable
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	197	212	231
Recorded Investment	$ 679	$ 717	$ 787
Unpaid Principal Balance	$ 679	$ 717	$ 787
Credit Card Receivable | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	197	212	231
Recorded Investment	$ 679	$ 717	$ 787
Unpaid Principal Balance	$ 679	$ 717	$ 787
Residential Real Estate | Covered TDR Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans			1
Recorded Investment			$ 184
Unpaid Principal Balance			$ 184
Installment
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	1,377	1,274	1,265
Recorded Investment	$ 43,857	$ 38,021	$ 33,071
Unpaid Principal Balance	$ 44,391	$ 38,461	$ 33,712
Installment | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	1,310	1,223	1,215
Recorded Investment	$ 42,272	$ 36,904	$ 31,927
Unpaid Principal Balance	$ 42,730	$ 37,250	$ 32,485
Installment | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	67	51	50
Recorded Investment	$ 1,585	$ 1,117	$ 1,144
Unpaid Principal Balance	$ 1,661	$ 1,211	$ 1,227
Consumer Home Equity Lines Financing Receivable
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	504	514	522
Recorded Investment	$ 23,923	$ 25,013	$ 25,122
Unpaid Principal Balance	$ 24,255	$ 25,389	$ 25,613
Consumer Home Equity Lines Financing Receivable | Originated Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	260	257	271
Recorded Investment	$ 7,874	$ 7,080	$ 7,421
Unpaid Principal Balance	$ 8,128	$ 7,330	$ 7,669
Consumer Home Equity Lines Financing Receivable | Acquired Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	173	176	174
Recorded Investment	$ 7,520	$ 7,718	$ 7,138
Unpaid Principal Balance	$ 7,583	$ 7,778	$ 7,205
Consumer Home Equity Lines Financing Receivable | Covered Consumer Loans
Financing Receivable, Modifications [Line Items]
Number of contracts at period end | loans	71	81	77
Recorded Investment	$ 8,529	$ 10,215	$ 10,563
Unpaid Principal Balance	$ 8,544	$ 10,281	$ 10,739