CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 386,956	$ 299,351
Available-for-sale debt securities	416,053	524,303
Held-to-maturity debt securities (fair value of $67,513 in 2018 and $65,133 in 2017)	66,776	64,227
Equity securities with readily determinable fair value	2,793	2,928
Mortgage loans held for sale, at fair value	12,653	5,761
Consumer loans held for sale, at fair value		2,677
Consumer loans held for sale, at the lower of cost or fair value	13,684	8,551
Loans (includes $2,237 of loans carried at fair value at June 30, 2018)	4,195,984	4,014,034
Allowance for loan and lease losses	(45,047)	(42,769)
Loans, net	4,150,937	3,971,265
Federal Home Loan Bank stock, at cost	32,067	32,067
Premises and equipment, net	43,734	42,588
Premises, held for sale	2,751	3,017
Goodwill	16,300	16,300
Other real estate owned		115
Bank owned life insurance	64,106	63,356
Other assets and accrued interest receivable	57,135	48,856
TOTAL ASSETS	5,265,945	5,085,362
Deposits:
Noninterest-bearing	1,061,182	1,022,042
Interest-bearing	2,412,187	2,411,116
Total deposits	3,473,369	3,433,158
Securities sold under agreements to repurchase and other short-term borrowings	175,291	204,021
Federal Home Loan Bank advances	860,000	737,500
Subordinated note	41,240	41,240
Other liabilities and accrued interest payable	52,037	37,019
Total liabilities	4,601,937	4,452,938
Commitments and contingent liabilities (Footnote 8)
STOCKHOLDERS' EQUITY
Preferred stock, no par value
Class A Common Stock and Class B Common Stock, no par value	4,903	4,902
Additional paid in capital	140,114	139,406
Retained earnings	520,784	487,700
Accumulated other comprehensive (loss) income	(1,793)	416
Total stockholders' equity	664,008	632,424
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	$ 5,265,945	$ 5,085,362