CONSOLIDATED STATEMENTS OF INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Loans receivable	$ 70,711	$ 69,322
Mortgage-backed securities	2,234	2,793
Taxable investment securities	1,045	1,080
Tax-free investment securities	1,348	1,655
Interest-earning deposits	139	200
Total interest income	75,477	75,050
Interest expense:
Deposits	5,766	6,490
Borrowed funds	8,133	7,714
Total interest expense	13,899	14,204
Net interest income	61,578	60,846
Provision for loan losses	900	7,485
Net interest income after provision for loan losses	60,678	53,361
Noninterest income:
Gain on sale of investments	95	3,348
Service charges and fees	8,659	8,408
Trust and other financial services income	2,776	3,047
Insurance commission income	2,428	2,564
Loss on real estate owned, net	(1,046)	(135)
Income from bank owned life insurance	913	1,001
Mortgage banking income	240	249
Other operating income	1,963	1,175
Total noninterest income	16,028	19,657
Noninterest expense:
Compensation and employee benefits	27,895	27,972
Premises and occupancy costs	6,267	6,557
Office operations	3,680	3,757
Processing expenses	7,205	6,589
Marketing expenses	1,976	1,637
Federal deposit insurance premiums	1,347	1,297
Professional services	1,792	2,062
Amortization of intangible assets	268	331
Real estate owned expense	692	639
Acquisition expense	347
Other expenses	2,242	2,322
Total noninterest expense	53,711	53,163
Income before income taxes	22,995	19,855
Provision for income taxes:
Federal and state income taxes	6,825	5,244
Net income	$ 16,170	$ 14,611
Basic earnings per share (in dollars per share)	$ 0.18	$ 0.16
Diluted earnings per share (in dollars per share)	$ 0.18	$ 0.16