Loans (Summary of the Aging Status of the Recorded Investment in Loans by Portfolio Segment/Class) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Originated Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	$ 11,928	$ 14,502	$ 22,816
Financing receivable, recorded investment 61 to 89 days past due	8,417	4,265	3,625
Financing receivable, recorded investment accruing loans past due 90 days or more	1,472	2,287	801
Financing receivable, recorded investment, Nonaccrual loans	53,419	62,225	53,440
Financing receivable recorded investment, Total past due	75,236	83,279	80,682
Financing receivable, recorded investment, current	5,926,478	5,724,655	4,967,980
Financing receivable, recorded investment, Total loans	6,001,714	5,807,934	5,048,662
Originated Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	4,069	3,685	10,121
Financing receivable, recorded investment 61 to 89 days past due	7,359	1,230	729
Financing receivable, recorded investment accruing loans past due 90 days or more	370	364	52
Financing receivable, recorded investment, Nonaccrual loans	19,264	28,554	18,904
Financing receivable recorded investment, Total past due	31,062	33,833	29,806
Financing receivable, recorded investment, current	1,532,862	1,487,682	1,235,101
Financing receivable, recorded investment, Total loans	1,563,924	1,521,515	1,264,907
Originated Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	3,096	4,168	7,238
Financing receivable, recorded investment 61 to 89 days past due	376	1,603	2,267
Financing receivable, recorded investment accruing loans past due 90 days or more	0	254	148
Financing receivable, recorded investment, Nonaccrual loans	25,859	25,163	24,766
Financing receivable recorded investment, Total past due	29,331	31,188	34,419
Financing receivable, recorded investment, current	1,470,979	1,392,871	1,237,929
Financing receivable, recorded investment, Total loans	1,500,310	1,424,059	1,272,348
Originated Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	216	0	340
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	546	521	953
Financing receivable recorded investment, Total past due	762	521	1,293
Financing receivable, recorded investment, current	198,906	184,626	98,892
Financing receivable, recorded investment, Total loans	199,668	185,147	100,185
Originated Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	757	1,737	1,246
Financing receivable, recorded investment 61 to 89 days past due	23	0	88
Financing receivable, recorded investment accruing loans past due 90 days or more	423	402	172
Financing receivable, recorded investment, Nonaccrual loans	5,062	5,557	6,514
Financing receivable recorded investment, Total past due	6,265	7,696	8,020
Financing receivable, recorded investment, current	1,255,903	1,209,279	999,552
Financing receivable, recorded investment, Total loans	1,262,168	1,216,975	1,007,572
Originated Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	2,158	3,145	2,143
Financing receivable, recorded investment 61 to 89 days past due	336	644	344
Financing receivable, recorded investment accruing loans past due 90 days or more	0	0	0
Financing receivable, recorded investment, Nonaccrual loans	360	451	433
Financing receivable recorded investment, Total past due	2,854	4,240	2,920
Financing receivable, recorded investment, current	887,298	865,186	832,439
Financing receivable, recorded investment, Total loans	890,152	869,426	835,359
Originated Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,632	1,767	1,728
Financing receivable, recorded investment 61 to 89 days past due	323	788	197
Financing receivable, recorded investment accruing loans past due 90 days or more	679	1,267	429
Financing receivable, recorded investment, Nonaccrual loans	2,328	1,979	1,870
Financing receivable recorded investment, Total past due	4,962	5,801	4,224
Financing receivable, recorded investment, current	580,530	585,011	564,067
Financing receivable, recorded investment, Total loans	585,492	590,812	568,291
Acquired Portfolio [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	1,207	6,319	2,299
Financing receivable, recorded investment 61 to 89 days past due	1,138	1,301	378
Financing receivable, recorded investment accruing loans past due 90 days or more	10,119	12,795	11,231
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	12,464	20,415	13,908
Financing receivable, recorded investment, current	1,352,707	1,442,798	640,304
Financing receivable, recorded investment, Total loans	1,365,171	1,463,213	654,212
Acquired Portfolio [Member] | Commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	55	490	59
Financing receivable, recorded investment 61 to 89 days past due	70	532	5
Financing receivable, recorded investment accruing loans past due 90 days or more	1,582	3,735	2,089
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,707	4,757	2,153
Financing receivable, recorded investment, current	356,628	379,607	89,109
Financing receivable, recorded investment, Total loans	358,335	384,364	91,262
Acquired Portfolio [Member] | Real estate commercial [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	249	3,557	1,784
Financing receivable, recorded investment 61 to 89 days past due	557	691	138
Financing receivable, recorded investment accruing loans past due 90 days or more	4,459	4,771	6,271
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	5,265	9,019	8,193
Financing receivable, recorded investment, current	637,476	679,084	336,382
Financing receivable, recorded investment, Total loans	642,741	688,103	344,575
Acquired Portfolio [Member] | Real estate construction [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	0	0	0
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	1,159	1,154	1,537
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	1,159	1,154	1,537
Financing receivable, recorded investment, current	42,072	45,775	7,117
Financing receivable, recorded investment, Total loans	43,231	46,929	8,654
Acquired Portfolio [Member] | Real estate residential [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	301	1,370	104
Financing receivable, recorded investment 61 to 89 days past due	0	0	0
Financing receivable, recorded investment accruing loans past due 90 days or more	1,877	2,081	868
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,178	3,451	972
Financing receivable, recorded investment, current	196,774	209,210	108,901
Financing receivable, recorded investment, Total loans	198,952	212,661	109,873
Acquired Portfolio [Member] | Consumer installment [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	59	55	3
Financing receivable, recorded investment 61 to 89 days past due	0	0	1
Financing receivable, recorded investment accruing loans past due 90 days or more	45	47	11
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	104	102	15
Financing receivable, recorded investment, current	6,822	7,929	8,692
Financing receivable, recorded investment, Total loans	6,926	8,031	8,707
Acquired Portfolio [Member] | Home equity [Member]
Schedule representing the aging status of the recorded investment in loans by classes
Financing receivable, recorded investment 31 to 60 days past due	543	847	349
Financing receivable, recorded investment 61 to 89 days past due	511	78	234
Financing receivable, recorded investment accruing loans past due 90 days or more	997	1,007	455
Financing receivable, recorded investment, Nonaccrual loans	0	0	0
Financing receivable recorded investment, Total past due	2,051	1,932	1,038
Financing receivable, recorded investment, current	112,935	121,193	90,103
Financing receivable, recorded investment, Total loans	$ 114,986	$ 123,125	$ 91,141