Available for Sale and Held to Maturity securities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale and Held-to-maturity	$ 1,046,392	$ 941,692
Available-for-sale Securities:
Amortized Cost	450,548	448,219
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax	1,233	3,740
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	(9,029)	(4,461)
Equity Securities, FV-NI	442,752	447,498
Debt Securities, Available-for-sale, Amortized Cost	450,548
Amortized Cost	611,490	497,688
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	2,533	2,429
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10,383)	(5,923)
Fair Value	603,640	494,194
Available for Sale Securities and Held to Maturity Securities Amortized Cost	1,062,038	945,907
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Gains	3,766	6,169
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Losses	(19,412)	(10,384)
U.S. Government agency securities
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		86
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(439)	(131)
Equity Securities, FV-NI	32,038	35,430
Debt Securities, Available-for-sale, Amortized Cost	32,477	35,475
U.S. treasury securities [Member]
Available-for-sale Securities:
Amortized Cost	1,004	1,006
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	11	29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Fair Value	1,015	1,035
Agency mortgage-backed securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,020	1,897
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,406)	(1,067)
Equity Securities, FV-NI	220,105	215,764
Debt Securities, Available-for-sale, Amortized Cost	222,491	214,934
Amortized Cost	252,484	204,768
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	1,548	1,791
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(3,104)	(736)
Fair Value	250,928	205,823
Agency collateralized mortgage obligations [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	197	78
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(3,435)	(2,164)
Equity Securities, FV-NI	134,911	122,012
Debt Securities, Available-for-sale, Amortized Cost	138,149	124,098
Amortized Cost	332,775	262,998
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	869	397
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(6,920)	(4,987)
Fair Value	326,724	258,408
State, county, and municipal securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	16	37
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	1,735	2,274
Debt Securities, Available-for-sale, Amortized Cost	1,719	2,237
Amortized Cost	0
Fair Value	0
Single issuer trust preferred securities issued by banks [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		4
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(10)	0
Equity Securities, FV-NI	707	2,016
Debt Securities, Available-for-sale, Amortized Cost	717	2,012
Amortized Cost	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	29
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10)	0
Fair Value	1,490	1,529
Pooled trust preferred securities issued by banks and insurers
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(349)	(539)
Equity Securities, FV-NI	1,329	1,640
Debt Securities, Available-for-sale, Amortized Cost	1,678	2,179
Small Business Administration Pooled Securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	44
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(1,390)	(118)
Equity Securities, FV-NI	51,927	47,778
Debt Securities, Available-for-sale, Amortized Cost	53,317	47,852
Amortized Cost	23,727	27,416
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	105	183
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(349)	(200)
Fair Value	23,483	27,399
Marketable securities [Member]
Available-for-sale Securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		1,594
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(442)
Equity Securities, FV-NI	0	20,584
Debt Securities, Available-for-sale, Amortized Cost	$ 0	$ 19,432