Available for Sale and Held to Maturity securities (Details 1) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Schedule of Available-for-sale Securities and Held-to-maturity Securities [Line Items]
Debt Securities, Available-for-sale and Held-to-maturity	$ 1,179,687	$ 1,046,392
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,118	1,233
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(397)	(9,029)
Equity Securities, FV-NI	426,424	442,752
Debt Securities, Available-for-sale, Amortized Cost	420,703	450,548
Amortized Cost	740,806	611,490
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	13,428	2,533
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(971)	(10,383)
Fair Value	753,263	603,640
Available for Sale Securities and Held to Maturity Securities Amortized Cost	1,161,509	1,062,038
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Gains	19,546	3,766
Available for Sale Securities and Held to Maturity Securities Gross Unrealized Losses	(1,368)	(19,412)
U.S. government agency securities
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	642
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(439)
Equity Securities, FV-NI	33,115	32,038
Debt Securities, Available-for-sale, Amortized Cost	32,473	32,477
Amortized Cost	12,874	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	123
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Fair Value	12,997
U.S. treasury securities [Member]
Reconciliation of fair value of securities:
Amortized Cost	4,032	1,004
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	21	11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	0
Fair Value	4,053	1,015
Agency mortgage-backed securities [Member]
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	3,456	1,020
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(4)	(3,406)
Equity Securities, FV-NI	247,000	220,105
Debt Securities, Available-for-sale, Amortized Cost	243,548	222,491
Amortized Cost	397,414	252,484
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	8,445	1,548
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(57)	(3,104)
Fair Value	405,802	250,928
Agency collateralized mortgage obligations [Member]
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,225	197
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	(19)	(3,435)
Equity Securities, FV-NI	88,511	134,911
Debt Securities, Available-for-sale, Amortized Cost	87,305	138,149
Amortized Cost	293,662	332,775
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	4,501	869
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(849)	(6,920)
Fair Value	297,314	326,724
State, county, and municipal securities [Member]
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	19	16
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Equity Securities, FV-NI	1,396	1,735
Debt Securities, Available-for-sale, Amortized Cost	1,377	1,719
Single issuer trust preferred securities issued by banks [Member]
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	5
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(10)
Equity Securities, FV-NI	493	707
Debt Securities, Available-for-sale, Amortized Cost	488	717
Amortized Cost	1,500	1,500
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10)	(10)
Fair Value	1,490	1,490
Pooled trust preferred securities issued by banks and insurers
Reconciliation of fair value of 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	(374)	(349)
Equity Securities, FV-NI	1,114	1,329
Debt Securities, Available-for-sale, Amortized Cost	1,488	1,678
Small Business Administration Pooled Securities [Member]
Reconciliation of fair value of securities:
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	771	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	(1,390)
Equity Securities, FV-NI	54,795	51,927
Debt Securities, Available-for-sale, Amortized Cost	54,024	53,317
Amortized Cost	31,324	23,727
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	338	105
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(55)	(349)
Fair Value	$ 31,607	$ 23,483