Business Combination (Details) (USD $)	3 Months Ended	9 Months Ended					0 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	May 10, 2013 Boston Private [Member]	Feb. 28, 2013 American Heritage Holdings [Member]	Feb. 29, 2012 First Independent Bank [Member]	Sep. 30, 2012 First Independent Bank [Member]	Sep. 30, 2012 First Independent Bank [Member]	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]	Sep. 30, 2013 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]	Dec. 31, 2012 Fair Value, Inputs, Level 3 [Member] Fair Value, Measurements, Recurring [Member]
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Business Combination, Consideration Transferred							$ 6,500,000
Business Combination, Consideration Transferred, Other							2,200,000
Bargain purchase gain		7,544,000	0				7,544,000
Net purchase price						122,985,000	16,293,000	40,647,000
Contingent consideration	14,051,000		14,051,000	15,442,000	0			11,700,000									0	15,442,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Cash and cash equivalents						340,000	15,626,000	150,045,000
Investments and MBS							1,030,000	187,465,000
Loans receivable						273,353,000	97,262,000	349,990,000
Goodwill	22,577,000	36,633,000	22,577,000	22,577,000	0	14,056,000		22,577,000
Core deposit intangible						1,674,000	453,000	11,974,000
Fixed assets								4,038,000
Other assets						2,721,000	27,197,000	10,886,000
Total assets acquired						292,144,000	141,568,000	736,975,000
Deposits						168,246,000	118,221,000	695,919,000
Other Liabilties						913,000	7,054,000	409,000
Total liabilities assumed						169,159,000	125,275,000	696,328,000
Net assets acquired						122,985,000	16,293,000	40,647,000
Consideration paid							8,749,000	28,900,000
Bargain purchase gain		7,544,000	0				7,544,000
Contractual cash flows											16,100,000	24,400,000
Expected cash flows											13,600,000	17,200,000
Present value of expected cash flows											11,900,000	15,300,000
Loan Principal Guaranteed By Government Agencies											9,800,000
Unpaid principal balance and contractual interest													164,200,000	280,700,000	83,300,000	403,800,000
Cash flows not expected to be collected													3,700,000	3,500,000	3,900,000	12,700,000
Discount on acquired loans													3,800,000	5,100,000	4,500,000	21,800,000
Business Acquisition, Pro Forma Information [Abstract]
Net interest income	75,308,000		235,052,000						5,104,000	16,204,000
Noninterest income	46,698,000		124,031,000						1,247,000	3,428,000
Net income	$ 30,598,000		$ 368,989,000						$ 2,630,000	$ 8,638,000
Earnings per share - basic	$ 0.49		$ 5.94						$ 0.04	$ 0.14
Earnings per share - diluted	$ 0.49		$ 5.89						$ 0.04	$ 0.14