Related Party Transactions (Details) (Directors, executive officers and their related parties, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Directors, executive officers and their related parties
Related party transactions
Balance, beginning of period	$ 36,783	$ 29,301
Additions, new loans and advances	23,888	9,749
Repayments	(18,407)	(6,223)
Balance, end of period	$ 42,264	$ 32,827