Parent Company Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets:
Deferred tax asset		$ 39,494	$ 32,173
Derivative Asset		26,113	17,318
Other Assets		132,507	123,119
Total assets		8,851,592	8,082,029
Liabilities and stockholders’ equity
Junior subordinated debentures		76,173	73,073
Subordinated Debt		34,728	34,682
Other liabilities		92,275	85,269
Total liabilities		7,778,102	7,138,220
Stockholders’ equity		1,073,490	943,809	$ 864,690	$ 771,463
Liabilities and Equity		8,851,592	8,082,029
Parent Company [Member]
Assets:
Cash	[1]	64,256	48,131
Investments in subsidiaries	[2]	1,128,407	1,010,125
Prepaid income taxes		1,014	786
Deferred tax asset			96
Derivative Asset	[1]	1,711	1,535
Other Assets		37	0
Total assets		1,195,425	1,060,673
Liabilities and stockholders’ equity
Dividends payable		10,671	8,786
Junior subordinated debentures		76,173	73,073
Subordinated Debt		34,728	34,682
Other liabilities		363	323
Total liabilities		121,935	116,864
Stockholders’ equity		1,073,490	943,809
Liabilities and Equity		$ 1,195,425	$ 1,060,673

[1] Entire balance eliminates in consolidation.

[2] eliminates in consolidation