Business Combinations (Details) (USD $)	12 Months Ended					0 Months Ended		10 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Oct. 02, 2013 Commerce National Bank [Member]	May 10, 2013 Boston Private [Member]	Feb. 28, 2013 American Heritage Holdings [Member]	Feb. 29, 2012 First Independent Bank	Dec. 31, 2012 First Independent Bank	Feb. 28, 2013 Evidence of Credit Deterioration [Member]	Feb. 29, 2012 Evidence of Credit Deterioration [Member]	Oct. 02, 2013 No Evidence of credit deterioration [Member]	May 10, 2013 No Evidence of credit deterioration [Member]	Feb. 28, 2013 No Evidence of credit deterioration [Member]	Feb. 29, 2012 No Evidence of credit deterioration [Member]
Business Acquisition [Line Items]
Net Assets Acquired				$ 42,907,000	$ 122,985,000	$ 16,293,000	$ 40,647,000
Business Combination, Consideration Transferred						6,500,000
Business Combination, Consideration Transferred, Other						2,200,000
Payments to Acquire Businesses, Gross						8,749,000	28,900,000
Contractual Cash Flows - Purchase Impaired Loans									16,100,000	24,400,000
Cash Flows Expected to be Collected - Purchase Impaired Loans									13,600,000	17,200,000
Fair Value - Purchase Impaired Loans									11,900,000	15,300,000
Loan Principal Guaranteed By Government Agencies - Purchase Impaired Loans									9,800,000
Contractual Cash Flows - Nonpurchase Impaired Acquired Loans											164,200,000	280,700,000	83,300,000	403,800,000
Cash Flows Not Expected to be Collected-Nonpurchase Impaired Acquired Loans											3,700,000	3,500,000	3,900,000	12,700,000
Discount-Nonpurchase Impaired Acquired Loans											3,800,000	5,100,000	4,500,000	21,800,000
Contingent consideration		15,442,000	0				11,700,000
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Cash and cash equivalents				8,555,000	340,000	15,626,000	150,045,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables				161,043,000	273,353,000	97,262,000	349,990,000
Investments and MBS				69,353,000		1,030,000	187,465,000
Goodwill	52,018,000	22,577,000	0	15,384,000	14,056,000		22,577,000
Core Deposit Intangibles				1,160,000	1,674,000	453,000	11,974,000
Fixed Assets							4,038,000
Other Assets				5,325,000	2,721,000	27,197,000	10,886,000
Total assets acquired				260,820,000	292,144,000	141,568,000	736,975,000
Deposits				189,563,000	168,246,000	118,221,000	695,919,000
Advances from FHLB				25,000,000
Other Liabilities				3,350,000	913,000	7,054,000	409,000
Total liabilities assumed				217,913,000	169,159,000	125,275,000	696,328,000
Business Combination, Bargain Purchase, Gain Recognized, Amount	7,544,000	0	0			7,544,000
Business Acquisition, Pro Forma Information [Abstract]
Net interest income		311,159,000	326,916,000					20,145,000
Noninterest income		155,258,000	135,828,000					4,757,000
Net income		$ 389,935,000	$ 49,469,000					$ 10,817,000
Earnigns per share - basic		$ 6.28	$ 0.80					$ 0.17
Earnings per share - diluted		$ 6.21	$ 0.79					$ 0.17