INCOME TAXES (Details 4) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Allowance for loan losses and OREO reserves	$ 127,078	$ 132,221
Investments in partnerships, tax credit and other investments, net	0	2,644
Net operating loss (“NOL”) carryforwards	283	282
Deferred compensation	25,824	27,512
Mortgage servicing assets	0	1,118
Purchased loan premiums	218	220
Unrealized losses on securities	21,568	5,153
State taxes	1,333	0
Interest income on nonaccrual loans	5,719	5,268
Other, net	6,918	17,385
Total gross deferred tax assets	188,941	191,803
Valuation allowance	(283)	(282)
Total deferred tax assets, net of valuation allowance	188,658	191,521
Deferred tax liabilities:
Core deposit intangibles	(12,642)	(16,204)
Investments in partnerships, tax credit and other investments, net	(1,694)	0
Property, plant and equipment	(31,632)	(19,260)
FHLB stock dividends	(1,524)	(2,847)
Deferred loan fees	0	(1,530)
State taxes	0	(912)
Mortgage servicing assets	(236)	0
Acquired debt	(2,833)	(2,932)
Acquired loans and OREO	(7,055)	(9,342)
Other, net	(1,344)	(2,623)
Total gross deferred tax liabilities	(58,960)	(55,650)
Net deferred tax assets	129,698	135,871
Federal
Deferred tax assets:
Allowance for loan losses and OREO reserves	97,921	102,382
Investments in partnerships, tax credit and other investments, net	0	(1,250)
Net operating loss (“NOL”) carryforwards	0	0
Deferred compensation	20,093	21,484
Mortgage servicing assets	0	875
Purchased loan premiums	170	172
Unrealized losses on securities	16,253	4,070
State taxes	1,333	0
Interest income on nonaccrual loans	4,461	4,124
Other, net	1,883	13,520
Total gross deferred tax assets	142,114	145,377
Valuation allowance	0	0
Total deferred tax assets, net of valuation allowance	142,114	145,377
Deferred tax liabilities:
Core deposit intangibles	(9,768)	(12,588)
Investments in partnerships, tax credit and other investments, net	(7,012)	0
Property, plant and equipment	(26,406)	(15,167)
FHLB stock dividends	(1,189)	(2,229)
Deferred loan fees	0	(1,198)
State taxes	0	(912)
Mortgage servicing assets	(184)	0
Acquired debt	(2,210)	(2,295)
Acquired loans and OREO	(5,407)	(7,222)
Other, net	(1,025)	(1,740)
Total gross deferred tax liabilities	(53,201)	(43,351)
Net deferred tax assets	88,913	102,026
State
Deferred tax assets:
Allowance for loan losses and OREO reserves	27,792	28,686
Investments in partnerships, tax credit and other investments, net	0	3,894
Net operating loss (“NOL”) carryforwards	283	282
Deferred compensation	5,731	6,028
Mortgage servicing assets	0	243
Purchased loan premiums	48	48
Unrealized losses on securities	5,315	1,083
State taxes	0	0
Interest income on nonaccrual loans	1,258	1,144
Other, net	4,938	3,769
Total gross deferred tax assets	45,365	45,177
Valuation allowance	(283)	(282)
Total deferred tax assets, net of valuation allowance	45,082	44,895
Deferred tax liabilities:
Core deposit intangibles	(2,874)	(3,616)
Investments in partnerships, tax credit and other investments, net	5,318	0
Property, plant and equipment	(5,226)	(4,093)
FHLB stock dividends	(335)	(618)
Deferred loan fees	0	(332)
State taxes	0	0
Mortgage servicing assets	(52)	0
Acquired debt	(623)	(637)
Acquired loans and OREO	(1,242)	(1,714)
Other, net	(319)	(883)
Total gross deferred tax liabilities	(5,353)	(11,893)
Net deferred tax assets	39,729	33,002
Foreign
Deferred tax assets:
Allowance for loan losses and OREO reserves	1,365	1,153
Investments in partnerships, tax credit and other investments, net	0	0
Net operating loss (“NOL”) carryforwards	0	0
Deferred compensation	0	0
Mortgage servicing assets	0	0
Purchased loan premiums	0	0
Unrealized losses on securities	0	0
State taxes	0	0
Interest income on nonaccrual loans	0	0
Other, net	97	96
Total gross deferred tax assets	1,462	1,249
Valuation allowance	0	0
Total deferred tax assets, net of valuation allowance	1,462	1,249
Deferred tax liabilities:
Core deposit intangibles	0	0
Investments in partnerships, tax credit and other investments, net	0	0
Property, plant and equipment	0	0
FHLB stock dividends	0	0
Deferred loan fees	0	0
State taxes	0	0
Mortgage servicing assets	0	0
Acquired debt	0	0
Acquired loans and OREO	(406)	(406)
Other, net	0	0
Total gross deferred tax liabilities	(406)	(406)
Net deferred tax assets	$ 1,056	$ 843